Re: [PATCH v2 02/22] mtd: spi-nor: Introduce 'struct spi_nor_controller_ops'
From: Boris Brezillon
Date: Thu Oct 10 2019 - 02:51:30 EST
On Tue, 24 Sep 2019 07:45:53 +0000
<Tudor.Ambarus@xxxxxxxxxxxxx> wrote:
> From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
>
> Move all SPI NOR controller driver specific ops in a dedicated
> structure. 'struct spi_nor' becomes lighter.
>
> Use size_t for lengths in 'int (*write_reg)()' and 'int (*read_reg)()'.
> Rename wite/read_buf to buf, the name of the functions are
> suggestive enough. Constify buf in int (*write_reg). Comply with these
> changes in the SPI NOR controller drivers.
>
> Suggested-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> ---
> drivers/mtd/spi-nor/aspeed-smc.c | 23 ++++++-----
> drivers/mtd/spi-nor/cadence-quadspi.c | 39 ++++++++++--------
> drivers/mtd/spi-nor/hisi-sfc.c | 22 +++++-----
> drivers/mtd/spi-nor/intel-spi.c | 24 ++++++-----
> drivers/mtd/spi-nor/mtk-quadspi.c | 25 +++++++-----
> drivers/mtd/spi-nor/nxp-spifi.c | 23 +++++++----
> drivers/mtd/spi-nor/spi-nor.c | 76 ++++++++++++++++++++---------------
> include/linux/mtd/spi-nor.h | 51 +++++++++++++----------
> 8 files changed, 166 insertions(+), 117 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/aspeed-smc.c b/drivers/mtd/spi-nor/aspeed-smc.c
> index 009c1da8574c..2b7cabbb680c 100644
> --- a/drivers/mtd/spi-nor/aspeed-smc.c
> +++ b/drivers/mtd/spi-nor/aspeed-smc.c
> @@ -320,7 +320,8 @@ static void aspeed_smc_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
> mutex_unlock(&chip->controller->mutex);
> }
>
> -static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> + size_t len)
> {
> struct aspeed_smc_chip *chip = nor->priv;
>
> @@ -331,8 +332,8 @@ static int aspeed_smc_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> return 0;
> }
>
> -static int aspeed_smc_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> - int len)
> +static int aspeed_smc_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len)
> {
> struct aspeed_smc_chip *chip = nor->priv;
>
> @@ -746,6 +747,15 @@ static int aspeed_smc_chip_setup_finish(struct aspeed_smc_chip *chip)
> return 0;
> }
>
> +static const struct spi_nor_controller_ops aspeed_smc_controller_ops = {
> + .prepare = aspeed_smc_prep,
> + .unprepare = aspeed_smc_unprep,
> + .read_reg = aspeed_smc_read_reg,
> + .write_reg = aspeed_smc_write_reg,
> + .read = aspeed_smc_read_user,
> + .write = aspeed_smc_write_user,
> +};
> +
> static int aspeed_smc_setup_flash(struct aspeed_smc_controller *controller,
> struct device_node *np, struct resource *r)
> {
> @@ -805,12 +815,7 @@ static int aspeed_smc_setup_flash(struct aspeed_smc_controller *controller,
> nor->dev = dev;
> nor->priv = chip;
> spi_nor_set_flash_node(nor, child);
> - nor->read = aspeed_smc_read_user;
> - nor->write = aspeed_smc_write_user;
> - nor->read_reg = aspeed_smc_read_reg;
> - nor->write_reg = aspeed_smc_write_reg;
> - nor->prepare = aspeed_smc_prep;
> - nor->unprepare = aspeed_smc_unprep;
> + nor->controller_ops = &aspeed_smc_controller_ops;
>
> ret = aspeed_smc_chip_setup_init(chip, r);
> if (ret)
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index 7bef63947b29..ebda612641a4 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -356,18 +356,19 @@ static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg)
>
> static int cqspi_command_read(struct spi_nor *nor,
> const u8 *txbuf, const unsigned n_tx,
> - u8 *rxbuf, const unsigned n_rx)
> + u8 *rxbuf, size_t n_rx)
> {
> struct cqspi_flash_pdata *f_pdata = nor->priv;
> struct cqspi_st *cqspi = f_pdata->cqspi;
> void __iomem *reg_base = cqspi->iobase;
> unsigned int rdreg;
> unsigned int reg;
> - unsigned int read_len;
> + size_t read_len;
> int status;
>
> if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) {
> - dev_err(nor->dev, "Invalid input argument, len %d rxbuf 0x%p\n",
> + dev_err(nor->dev,
> + "Invalid input argument, len %zu rxbuf 0x%p\n",
> n_rx, rxbuf);
> return -EINVAL;
> }
> @@ -404,19 +405,19 @@ static int cqspi_command_read(struct spi_nor *nor,
> }
>
> static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
> - const u8 *txbuf, const unsigned n_tx)
> + const u8 *txbuf, size_t n_tx)
> {
> struct cqspi_flash_pdata *f_pdata = nor->priv;
> struct cqspi_st *cqspi = f_pdata->cqspi;
> void __iomem *reg_base = cqspi->iobase;
> unsigned int reg;
> unsigned int data;
> - u32 write_len;
> + size_t write_len;
> int ret;
>
> if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
> dev_err(nor->dev,
> - "Invalid input argument, cmdlen %d txbuf 0x%p\n",
> + "Invalid input argument, cmdlen %zu txbuf 0x%p\n",
> n_tx, txbuf);
> return -EINVAL;
> }
> @@ -1050,7 +1051,7 @@ static int cqspi_erase(struct spi_nor *nor, loff_t offs)
> return ret;
>
> /* Send write enable, then erase commands. */
> - ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> + ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> if (ret)
> return ret;
>
> @@ -1080,7 +1081,7 @@ static void cqspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
> mutex_unlock(&cqspi->bus_mutex);
> }
>
> -static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
> {
> int ret;
>
> @@ -1091,7 +1092,8 @@ static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> return ret;
> }
>
> -static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len)
> {
> int ret;
>
> @@ -1216,6 +1218,16 @@ static void cqspi_request_mmap_dma(struct cqspi_st *cqspi)
> init_completion(&cqspi->rx_dma_complete);
> }
>
> +static const struct spi_nor_controller_ops cqspi_controller_ops = {
> + .prepare = cqspi_prep,
> + .unprepare = cqspi_unprep,
> + .read_reg = cqspi_read_reg,
> + .write_reg = cqspi_write_reg,
> + .read = cqspi_read,
> + .write = cqspi_write,
> + .erase = cqspi_erase,
> +};
> +
> static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
> {
> struct platform_device *pdev = cqspi->pdev;
> @@ -1265,14 +1277,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
> nor->dev = dev;
> spi_nor_set_flash_node(nor, np);
> nor->priv = f_pdata;
> -
> - nor->read_reg = cqspi_read_reg;
> - nor->write_reg = cqspi_write_reg;
> - nor->read = cqspi_read;
> - nor->write = cqspi_write;
> - nor->erase = cqspi_erase;
> - nor->prepare = cqspi_prep;
> - nor->unprepare = cqspi_unprep;
> + nor->controller_ops = &cqspi_controller_ops;
>
> mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d",
> dev_name(dev), cs);
> diff --git a/drivers/mtd/spi-nor/hisi-sfc.c b/drivers/mtd/spi-nor/hisi-sfc.c
> index c99ed9cdbf9c..a1258216f89d 100644
> --- a/drivers/mtd/spi-nor/hisi-sfc.c
> +++ b/drivers/mtd/spi-nor/hisi-sfc.c
> @@ -177,7 +177,7 @@ static void hisi_spi_nor_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
> }
>
> static int hisi_spi_nor_op_reg(struct spi_nor *nor,
> - u8 opcode, int len, u8 optype)
> + u8 opcode, size_t len, u8 optype)
> {
> struct hifmc_priv *priv = nor->priv;
> struct hifmc_host *host = priv->host;
> @@ -200,7 +200,7 @@ static int hisi_spi_nor_op_reg(struct spi_nor *nor,
> }
>
> static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> - int len)
> + size_t len)
> {
> struct hifmc_priv *priv = nor->priv;
> struct hifmc_host *host = priv->host;
> @@ -215,7 +215,7 @@ static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> }
>
> static int hisi_spi_nor_write_reg(struct spi_nor *nor, u8 opcode,
> - u8 *buf, int len)
> + const u8 *buf, size_t len)
> {
> struct hifmc_priv *priv = nor->priv;
> struct hifmc_host *host = priv->host;
> @@ -311,6 +311,15 @@ static ssize_t hisi_spi_nor_write(struct spi_nor *nor, loff_t to,
> return len;
> }
>
> +static const struct spi_nor_controller_ops hisi_controller_ops = {
> + .prepare = hisi_spi_nor_prep,
> + .unprepare = hisi_spi_nor_unprep,
> + .read_reg = hisi_spi_nor_read_reg,
> + .write_reg = hisi_spi_nor_write_reg,
> + .read = hisi_spi_nor_read,
> + .write = hisi_spi_nor_write,
> +};
> +
> /**
> * Get spi flash device information and register it as a mtd device.
> */
> @@ -357,13 +366,8 @@ static int hisi_spi_nor_register(struct device_node *np,
> }
> priv->host = host;
> nor->priv = priv;
> + nor->controller_ops = &hisi_controller_ops;
>
> - nor->prepare = hisi_spi_nor_prep;
> - nor->unprepare = hisi_spi_nor_unprep;
> - nor->read_reg = hisi_spi_nor_read_reg;
> - nor->write_reg = hisi_spi_nor_write_reg;
> - nor->read = hisi_spi_nor_read;
> - nor->write = hisi_spi_nor_write;
> ret = spi_nor_scan(nor, NULL, &hwcaps);
> if (ret)
> return ret;
> diff --git a/drivers/mtd/spi-nor/intel-spi.c b/drivers/mtd/spi-nor/intel-spi.c
> index 43e55a2e9b27..dc38f19ac7ae 100644
> --- a/drivers/mtd/spi-nor/intel-spi.c
> +++ b/drivers/mtd/spi-nor/intel-spi.c
> @@ -426,7 +426,7 @@ static int intel_spi_opcode_index(struct intel_spi *ispi, u8 opcode, int optype)
> return 0;
> }
>
> -static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len)
> +static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, size_t len)
> {
> u32 val, status;
> int ret;
> @@ -469,7 +469,7 @@ static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, int len)
> return 0;
> }
>
> -static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, int len,
> +static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, size_t len,
> int optype)
> {
> u32 val = 0, status;
> @@ -535,7 +535,8 @@ static int intel_spi_sw_cycle(struct intel_spi *ispi, u8 opcode, int len,
> return 0;
> }
>
> -static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> + size_t len)
> {
> struct intel_spi *ispi = nor->priv;
> int ret;
> @@ -555,7 +556,8 @@ static int intel_spi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> return intel_spi_read_block(ispi, buf, len);
> }
>
> -static int intel_spi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int intel_spi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len)
> {
> struct intel_spi *ispi = nor->priv;
> int ret;
> @@ -864,6 +866,14 @@ static void intel_spi_fill_partition(struct intel_spi *ispi,
> }
> }
>
> +static const struct spi_nor_controller_ops intel_spi_controller_ops = {
> + .read_reg = intel_spi_read_reg,
> + .write_reg = intel_spi_write_reg,
> + .read = intel_spi_read,
> + .write = intel_spi_write,
> + .erase = intel_spi_erase,
> +};
> +
> struct intel_spi *intel_spi_probe(struct device *dev,
> struct resource *mem, const struct intel_spi_boardinfo *info)
> {
> @@ -897,11 +907,7 @@ struct intel_spi *intel_spi_probe(struct device *dev,
>
> ispi->nor.dev = ispi->dev;
> ispi->nor.priv = ispi;
> - ispi->nor.read_reg = intel_spi_read_reg;
> - ispi->nor.write_reg = intel_spi_write_reg;
> - ispi->nor.read = intel_spi_read;
> - ispi->nor.write = intel_spi_write;
> - ispi->nor.erase = intel_spi_erase;
> + ispi->nor.controller_ops = &intel_spi_controller_ops;
>
> ret = spi_nor_scan(&ispi->nor, NULL, &hwcaps);
> if (ret) {
> diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
> index 34db01ab6cab..b1691680d174 100644
> --- a/drivers/mtd/spi-nor/mtk-quadspi.c
> +++ b/drivers/mtd/spi-nor/mtk-quadspi.c
> @@ -151,9 +151,9 @@ static int mtk_nor_execute_cmd(struct mtk_nor *mtk_nor, u8 cmdval)
> }
>
> static int mtk_nor_do_tx_rx(struct mtk_nor *mtk_nor, u8 op,
> - u8 *tx, int txlen, u8 *rx, int rxlen)
> + const u8 *tx, size_t txlen, u8 *rx, size_t rxlen)
> {
> - int len = 1 + txlen + rxlen;
> + size_t len = 1 + txlen + rxlen;
> int i, ret, idx;
>
> if (len > MTK_NOR_MAX_SHIFT)
> @@ -193,7 +193,7 @@ static int mtk_nor_do_tx_rx(struct mtk_nor *mtk_nor, u8 op,
> }
>
> /* Do a WRSR (Write Status Register) command */
> -static int mtk_nor_wr_sr(struct mtk_nor *mtk_nor, u8 sr)
> +static int mtk_nor_wr_sr(struct mtk_nor *mtk_nor, const u8 sr)
> {
> writeb(sr, mtk_nor->base + MTK_NOR_PRGDATA5_REG);
> writeb(8, mtk_nor->base + MTK_NOR_CNT_REG);
> @@ -354,7 +354,7 @@ static ssize_t mtk_nor_write(struct spi_nor *nor, loff_t to, size_t len,
> return len;
> }
>
> -static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len)
> {
> int ret;
> struct mtk_nor *mtk_nor = nor->priv;
> @@ -376,8 +376,8 @@ static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> return ret;
> }
>
> -static int mtk_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> - int len)
> +static int mtk_nor_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len)
> {
> int ret;
> struct mtk_nor *mtk_nor = nor->priv;
> @@ -419,6 +419,13 @@ static int mtk_nor_enable_clk(struct mtk_nor *mtk_nor)
> return 0;
> }
>
> +static const struct spi_nor_controller_ops mtk_controller_ops = {
> + .read_reg = mtk_nor_read_reg,
> + .write_reg = mtk_nor_write_reg,
> + .read = mtk_nor_read,
> + .write = mtk_nor_write,
> +};
> +
> static int mtk_nor_init(struct mtk_nor *mtk_nor,
> struct device_node *flash_node)
> {
> @@ -438,12 +445,8 @@ static int mtk_nor_init(struct mtk_nor *mtk_nor,
> nor->dev = mtk_nor->dev;
> nor->priv = mtk_nor;
> spi_nor_set_flash_node(nor, flash_node);
> + nor->controller_ops = &mtk_controller_ops;
>
> - /* fill the hooks to spi nor */
> - nor->read = mtk_nor_read;
> - nor->read_reg = mtk_nor_read_reg;
> - nor->write = mtk_nor_write;
> - nor->write_reg = mtk_nor_write_reg;
> nor->mtd.name = "mtk_nor";
> /* initialized with NULL */
> ret = spi_nor_scan(nor, NULL, &hwcaps);
> diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c
> index 4a871587392b..9a5b1a7c636a 100644
> --- a/drivers/mtd/spi-nor/nxp-spifi.c
> +++ b/drivers/mtd/spi-nor/nxp-spifi.c
> @@ -123,7 +123,8 @@ static int nxp_spifi_set_memory_mode_on(struct nxp_spifi *spifi)
> return ret;
> }
>
> -static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> + size_t len)
> {
> struct nxp_spifi *spifi = nor->priv;
> u32 cmd;
> @@ -145,7 +146,8 @@ static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> return nxp_spifi_wait_for_cmd(spifi);
> }
>
> -static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
> +static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len)
> {
> struct nxp_spifi *spifi = nor->priv;
> u32 cmd;
> @@ -263,9 +265,18 @@ static int nxp_spifi_setup_memory_cmd(struct nxp_spifi *spifi)
> static void nxp_spifi_dummy_id_read(struct spi_nor *nor)
> {
> u8 id[SPI_NOR_MAX_ID_LEN];
> - nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN);
> + nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
> + SPI_NOR_MAX_ID_LEN);
> }
>
> +static const struct spi_nor_controller_ops nxp_spifi_controller_ops = {
> + .read_reg = nxp_spifi_read_reg,
> + .write_reg = nxp_spifi_write_reg,
> + .read = nxp_spifi_read,
> + .write = nxp_spifi_write,
> + .erase = nxp_spifi_erase,
> +};
> +
> static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
> struct device_node *np)
> {
> @@ -332,11 +343,7 @@ static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
> spifi->nor.dev = spifi->dev;
> spi_nor_set_flash_node(&spifi->nor, np);
> spifi->nor.priv = spifi;
> - spifi->nor.read = nxp_spifi_read;
> - spifi->nor.write = nxp_spifi_write;
> - spifi->nor.erase = nxp_spifi_erase;
> - spifi->nor.read_reg = nxp_spifi_read_reg;
> - spifi->nor.write_reg = nxp_spifi_write_reg;
> + spifi->nor.controller_ops = &nxp_spifi_controller_ops;
>
> /*
> * The first read on a hard reset isn't reliable so do a
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 1d8621d43160..b8c7ded0f145 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -338,7 +338,7 @@ static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
> if (nor->spimem)
> return spi_nor_spimem_read_data(nor, from, len, buf);
>
> - return nor->read(nor, from, len, buf);
> + return nor->controller_ops->read(nor, from, len, buf);
> }
>
> /**
> @@ -385,7 +385,7 @@ static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
> if (nor->spimem)
> return spi_nor_spimem_write_data(nor, to, len, buf);
>
> - return nor->write(nor, to, len, buf);
> + return nor->controller_ops->write(nor, to, len, buf);
> }
>
> /*
> @@ -406,7 +406,8 @@ static int read_sr(struct spi_nor *nor)
>
> ret = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - ret = nor->read_reg(nor, SPINOR_OP_RDSR, nor->bouncebuf, 1);
> + ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
> + nor->bouncebuf, 1);
> }
>
> if (ret < 0) {
> @@ -435,7 +436,8 @@ static int read_fsr(struct spi_nor *nor)
>
> ret = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - ret = nor->read_reg(nor, SPINOR_OP_RDFSR, nor->bouncebuf, 1);
> + ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDFSR,
> + nor->bouncebuf, 1);
> }
>
> if (ret < 0) {
> @@ -464,7 +466,8 @@ static int read_cr(struct spi_nor *nor)
>
> ret = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - ret = nor->read_reg(nor, SPINOR_OP_RDCR, nor->bouncebuf, 1);
> + ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDCR,
> + nor->bouncebuf, 1);
> }
>
> if (ret < 0) {
> @@ -492,7 +495,8 @@ static int write_sr(struct spi_nor *nor, u8 val)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_WRSR, nor->bouncebuf, 1);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
> + nor->bouncebuf, 1);
> }
>
> /*
> @@ -511,7 +515,7 @@ static int write_enable(struct spi_nor *nor)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
> }
>
> /*
> @@ -529,7 +533,7 @@ static int write_disable(struct spi_nor *nor)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
> }
>
> static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
> @@ -631,8 +635,9 @@ static int macronix_set_4byte(struct spi_nor *nor, bool enable)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B,
> - NULL, 0);
> + return nor->controller_ops->write_reg(nor, enable ? SPINOR_OP_EN4B :
> + SPINOR_OP_EX4B,
> + NULL, 0);
> }
>
> static int st_micron_set_4byte(struct spi_nor *nor, bool enable)
> @@ -660,7 +665,8 @@ static int spansion_set_4byte(struct spi_nor *nor, bool enable)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_BRWR, nor->bouncebuf, 1);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_BRWR,
> + nor->bouncebuf, 1);
> }
>
> static int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
> @@ -677,7 +683,8 @@ static int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_WREAR, nor->bouncebuf, 1);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_WREAR,
> + nor->bouncebuf, 1);
> }
>
> static int winbond_set_4byte(struct spi_nor *nor, bool enable)
> @@ -712,7 +719,7 @@ static int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->read_reg(nor, SPINOR_OP_XRDSR, sr, 1);
> + return nor->controller_ops->read_reg(nor, SPINOR_OP_XRDSR, sr, 1);
> }
>
> static int s3an_sr_ready(struct spi_nor *nor)
> @@ -740,7 +747,7 @@ static int spi_nor_clear_sr(struct spi_nor *nor)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
> }
>
> static int spi_nor_sr_ready(struct spi_nor *nor)
> @@ -774,7 +781,7 @@ static int spi_nor_clear_fsr(struct spi_nor *nor)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
> }
>
> static int spi_nor_fsr_ready(struct spi_nor *nor)
> @@ -871,7 +878,8 @@ static int erase_chip(struct spi_nor *nor)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_CHIP_ERASE, NULL, 0);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_CHIP_ERASE,
> + NULL, 0);
> }
>
> static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
> @@ -880,10 +888,9 @@ static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
>
> mutex_lock(&nor->lock);
>
> - if (nor->prepare) {
> - ret = nor->prepare(nor, ops);
> + if (nor->controller_ops && nor->controller_ops->prepare) {
> + ret = nor->controller_ops->prepare(nor, ops);
> if (ret) {
> - dev_err(nor->dev, "failed in the preparation.\n");
> mutex_unlock(&nor->lock);
> return ret;
> }
> @@ -893,8 +900,8 @@ static int spi_nor_lock_and_prep(struct spi_nor *nor, enum spi_nor_ops ops)
>
> static void spi_nor_unlock_and_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
> {
> - if (nor->unprepare)
> - nor->unprepare(nor, ops);
> + if (nor->controller_ops && nor->controller_ops->unprepare)
> + nor->controller_ops->unprepare(nor, ops);
> mutex_unlock(&nor->lock);
> }
>
> @@ -935,8 +942,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
>
> addr = spi_nor_convert_addr(nor, addr);
>
> - if (nor->erase)
> - return nor->erase(nor, addr);
> + if (nor->controller_ops && nor->controller_ops->erase)
> + return nor->controller_ops->erase(nor, addr);
>
> if (nor->spimem) {
> struct spi_mem_op op =
> @@ -957,8 +964,8 @@ static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
> addr >>= 8;
> }
>
> - return nor->write_reg(nor, nor->erase_opcode, nor->bouncebuf,
> - nor->addr_width);
> + return nor->controller_ops->write_reg(nor, nor->erase_opcode,
> + nor->bouncebuf, nor->addr_width);
> }
>
> /**
> @@ -1678,7 +1685,8 @@ static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
>
> ret = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
> + ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
> + sr_cr, 2);
> }
>
> if (ret < 0) {
> @@ -1873,7 +1881,7 @@ static int spi_nor_write_sr2(struct spi_nor *nor, u8 *sr2)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->write_reg(nor, SPINOR_OP_WRSR2, sr2, 1);
> + return nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR2, sr2, 1);
> }
>
> static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
> @@ -1888,7 +1896,7 @@ static int spi_nor_read_sr2(struct spi_nor *nor, u8 *sr2)
> return spi_mem_exec_op(nor->spimem, &op);
> }
>
> - return nor->read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
> + return nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR2, sr2, 1);
> }
>
> /**
> @@ -2520,8 +2528,8 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
>
> tmp = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - tmp = nor->read_reg(nor, SPINOR_OP_RDID, id,
> - SPI_NOR_MAX_ID_LEN);
> + tmp = nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
> + SPI_NOR_MAX_ID_LEN);
> }
> if (tmp < 0) {
> dev_err(nor->dev, "error %d reading JEDEC ID\n", tmp);
> @@ -2722,9 +2730,11 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
> static int spi_nor_check(struct spi_nor *nor)
> {
> if (!nor->dev ||
> - (!nor->spimem &&
> - (!nor->read || !nor->write || !nor->read_reg ||
> - !nor->write_reg))) {
> + (!nor->spimem && nor->controller_ops &&
> + (!nor->controller_ops->read ||
> + !nor->controller_ops->write ||
> + !nor->controller_ops->read_reg ||
> + !nor->controller_ops->write_reg))) {
> pr_err("spi-nor: please fill all the necessary fields!\n");
> return -EINVAL;
> }
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index fc0b4b19c900..d1d736d3c8ab 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -466,6 +466,34 @@ enum spi_nor_pp_command_index {
> struct spi_nor;
>
> /**
> + * struct spi_nor_controller_ops - SPI NOR controller driver specific
> + * operations.
> + * @prepare: [OPTIONAL] do some preparations for the
> + * read/write/erase/lock/unlock operations.
> + * @unprepare: [OPTIONAL] do some post work after the
> + * read/write/erase/lock/unlock operations.
> + * @read_reg: read out the register.
> + * @write_reg: write data to the register.
> + * @read: read data from the SPI NOR.
> + * @write: write data to the SPI NOR.
> + * @erase: erase a sector of the SPI NOR at the offset @offs; if
> + * not provided by the driver, spi-nor will send the erase
> + * opcode via write_reg().
> + */
> +struct spi_nor_controller_ops {
> + int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> + void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> + int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, size_t len);
> + int (*write_reg)(struct spi_nor *nor, u8 opcode, const u8 *buf,
> + size_t len);
> +
> + ssize_t (*read)(struct spi_nor *nor, loff_t from, size_t len, u8 *buf);
> + ssize_t (*write)(struct spi_nor *nor, loff_t to, size_t len,
> + const u8 *buf);
> + int (*erase)(struct spi_nor *nor, loff_t offs);
> +};
> +
> +/**
> * struct spi_nor_locking_ops - SPI NOR locking methods
> * @lock: lock a region of the SPI NOR.
> * @unlock: unlock a region of the SPI NOR.
> @@ -549,17 +577,7 @@ struct flash_info;
> * @read_proto: the SPI protocol for read operations
> * @write_proto: the SPI protocol for write operations
> * @reg_proto the SPI protocol for read_reg/write_reg/erase operations
> - * @prepare: [OPTIONAL] do some preparations for the
> - * read/write/erase/lock/unlock operations
> - * @unprepare: [OPTIONAL] do some post work after the
> - * read/write/erase/lock/unlock operations
> - * @read_reg: [DRIVER-SPECIFIC] read out the register
> - * @write_reg: [DRIVER-SPECIFIC] write data to the register
> - * @read: [DRIVER-SPECIFIC] read data from the SPI NOR
> - * @write: [DRIVER-SPECIFIC] write data to the SPI NOR
> - * @erase: [DRIVER-SPECIFIC] erase a sector of the SPI NOR
> - * at the offset @offs; if not provided by the driver,
> - * spi-nor will send the erase opcode via write_reg()
> + * @controller_ops: SPI NOR controller driver specific operations.
> * @clear_sr_bp: [FLASH-SPECIFIC] clears the Block Protection Bits from
> * the SPI NOR Status Register.
> * @params: [FLASH-SPECIFIC] SPI-NOR flash parameters and settings.
> @@ -588,16 +606,7 @@ struct spi_nor {
> bool sst_write_second;
> u32 flags;
>
> - int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> - void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
> - int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
> - int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
> -
> - ssize_t (*read)(struct spi_nor *nor, loff_t from,
> - size_t len, u_char *read_buf);
> - ssize_t (*write)(struct spi_nor *nor, loff_t to,
> - size_t len, const u_char *write_buf);
> - int (*erase)(struct spi_nor *nor, loff_t offs);
> + const struct spi_nor_controller_ops *controller_ops;
>
> int (*clear_sr_bp)(struct spi_nor *nor);
> struct spi_nor_flash_parameter params;