RE: [PATCH 1/3] mtd: spi-nor: Add Octal mode support for mt35xu512aba

From: Yogesh Narayan Gaur
Date: Thu Oct 04 2018 - 02:52:11 EST

Hi Vignesh,

> -----Original Message-----
> From: Vignesh R [mailto:vigneshr@xxxxxx]
> Sent: Wednesday, October 3, 2018 10:26 PM
> To: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>; Marek Vasut
> <marek.vasut@xxxxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Brian Norris <computersforpeace@xxxxxxxxx>; Yogesh Narayan Gaur
> <yogeshnarayan.gaur@xxxxxxx>; Linux ARM Mailing List <linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx>; linux-mtd@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Vignesh R
> <vigneshr@xxxxxx>
> Subject: [PATCH 1/3] mtd: spi-nor: Add Octal mode support for mt35xu512aba
>
> Micron's mt35xu512aba flash is an Octal flash that has x8 IO lines. It supports
> read/write over 8 IO lines simulatenously. Add support for Octal read mode for
> Micron mt35xu512aba.
> Unfortunately, this flash is only complaint to SFDP JESD216B and does not seem
> to support newer JESD216C standard that provides auto detection of Octal
> mode capabilities and opcodes. Therefore, this capability is manually added
> using new SPI_NOR_OCTAL_READ flag.
>

Thanks for sending the patch-set of adding octal support.
If possible, can you share the MT35x datasheet?

I also have the patch ready in which I have added support for Read (1-1-8 and 1-8-8) protocol and Write (1-1-8 and 1-8-8).
Also have added support of Octal in driver/spi/spi.c framework.

IMO, we would collaborate our patches.
--
Regards
Yogesh Gaur

> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
> ---
> drivers/mtd/spi-nor/spi-nor.c | 11 ++++++++++-
> include/linux/mtd/spi-nor.h | 2 ++
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index
> aff5e6ff0b2c..4926e805a8cb 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -90,6 +90,7 @@ struct flash_info {
> #define NO_CHIP_ERASE BIT(12) /* Chip does not support chip
> erase */
> #define SPI_NOR_SKIP_SFDP BIT(13) /* Skip parsing of SFDP tables */
> #define USE_CLSR BIT(14) /* use CLSR command */
> +#define SPI_NOR_OCTAL_READ BIT(15) /* Flash supports Octal Read */
>
> int (*quad_enable)(struct spi_nor *nor);
> };
> @@ -209,6 +210,7 @@ static inline u8 spi_nor_convert_3to4_read(u8 opcode)
> { SPINOR_OP_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B },
> { SPINOR_OP_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B },
> { SPINOR_OP_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B },
> + { SPINOR_OP_READ_1_1_8, SPINOR_OP_READ_1_1_8_4B },
>
> { SPINOR_OP_READ_1_1_1_DTR,
> SPINOR_OP_READ_1_1_1_DTR_4B },
> { SPINOR_OP_READ_1_2_2_DTR,
> SPINOR_OP_READ_1_2_2_DTR_4B },
> @@ -1406,7 +1408,7 @@ static const struct flash_info spi_nor_ids[] = {
> { "mt25qu02g", INFO(0x20bb22, 0, 64 * 1024, 4096, SECT_4K |
> USE_FSR | SPI_NOR_QUAD_READ | NO_CHIP_ERASE) },
>
> /* Micron */
> - { "mt35xu512aba", INFO(0x2c5b1a, 0, 128 * 1024, 512, SECT_4K |
> USE_FSR | SPI_NOR_4B_OPCODES) },
> + { "mt35xu512aba", INFO(0x2c5b1a, 0, 128 * 1024, 512, SECT_4K |
> USE_FSR
> +| SPI_NOR_OCTAL_READ | SPI_NOR_4B_OPCODES) },
>
> /* PMC */
> { "pm25lv512", INFO(0, 0, 32 * 1024, 2, SECT_4K_PMC) },
> @@ -3199,6 +3201,13 @@ static int spi_nor_init_params(struct spi_nor *nor,
> SNOR_PROTO_1_1_4);
> }
>
> + if (info->flags & SPI_NOR_OCTAL_READ) {
> + params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8;
> + spi_nor_set_read_settings(&params-
> >reads[SNOR_CMD_READ_1_1_8],
> + 0, 8, SPINOR_OP_READ_1_1_8,
> + SNOR_PROTO_1_1_8);
> + }
> +
> /* Page Program settings. */
> params->hwcaps.mask |= SNOR_HWCAPS_PP;
> spi_nor_set_pp_settings(&params->page_programs[SNOR_CMD_PP],
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index
> 8b1acf68b7ac..ae9861ed7e0f 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -50,6 +50,7 @@
> #define SPINOR_OP_READ_1_2_2 0xbb /* Read data bytes (Dual I/O
> SPI) */
> #define SPINOR_OP_READ_1_1_4 0x6b /* Read data bytes (Quad
> Output SPI) */
> #define SPINOR_OP_READ_1_4_4 0xeb /* Read data bytes (Quad I/O
> SPI) */
> +#define SPINOR_OP_READ_1_1_8 0x8b /* Read data bytes (Octal
> Output SPI) */
> #define SPINOR_OP_PP 0x02 /* Page program (up to 256 bytes) */
> #define SPINOR_OP_PP_1_1_4 0x32 /* Quad page program */
> #define SPINOR_OP_PP_1_4_4 0x38 /* Quad page program */
> @@ -73,6 +74,7 @@
> #define SPINOR_OP_READ_1_2_2_4B 0xbc /* Read data bytes (Dual I/O
> SPI) */
> #define SPINOR_OP_READ_1_1_4_4B 0x6c /* Read data bytes (Quad
> Output SPI) */
> #define SPINOR_OP_READ_1_4_4_4B 0xec /* Read data bytes (Quad I/O
> SPI) */
> +#define SPINOR_OP_READ_1_1_8_4B 0x7c /* Read data bytes (Octal
> Output SPI) */
> #define SPINOR_OP_PP_4B 0x12 /* Page program (up to 256
> bytes) */
> #define SPINOR_OP_PP_1_1_4_4B 0x34 /* Quad page program */
> #define SPINOR_OP_PP_1_4_4_4B 0x3e /* Quad page program */
> --
> 2.19.0