Re: [v2 PATCH 07/14] spi/atmel_spi: add DT support

[Jean-Christophe PLAGNIOL-VILLARD]

On 15:53 Tue 04 Dec     , Wenyou Yang wrote:
> From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> 
> The atmel_spi use only gpio for chip select.
no this patch need go on the TOP of mine

that is plan for 3.8

Best Regards,
J.
> 
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> [wenyou.yang@xxxxxxxxx: Add driver data and compatible "atmel,at91sam9260-spi", "atmel,at91sam9x5-spi"]
> Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx>
> Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> Cc: spi-devel-general@xxxxxxxxxxxxxxxxxxxxx
> Cc: grant.likely@xxxxxxxxxxxx
> Cc: rob.herring@xxxxxxxxxxx
> Cc: rob@xxxxxxxxxxx
> Cc: linux-doc@xxxxxxxxxxxxxxx
> Cc: richard.genoud@xxxxxxxxx
> ---
> Hi, Richard,
> 
> This patches is based on the original patch from Jean-Christophe
> 	[PATCH] spi/atmel: add DT support
> and merge the patch from Richard Genoud
> 	[PATCH] spi-atmel OF: complete documentation
> ane wenyou yang add more compatible "atmel,at91sam9260-spi", "atmel,at91sam9x5-spi", 
> 	add driver data to get IP version and dma support.
> 
> Could you sign your signature in this patch?
> 
> Best Regards,
> Wenyou Yang
> 
>  .../devicetree/bindings/spi/spi_atmel.txt          |   23 +++++
>  drivers/spi/spi-atmel.c                            |  102 +++++++++++++++++---
>  2 files changed, 113 insertions(+), 12 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/spi/spi_atmel.txt
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
> new file mode 100644
> index 0000000..20cdc91
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
> @@ -0,0 +1,23 @@
> +Atmel SPI device
> +
> +Required properties:
> +- compatible : should be "atmel,at91rm9200-spi".
> +- reg: Address and length of the register set for the device
> +- interrupts: Should contain macb interrupt
> +- cs-gpio: Should contain the GPIOs used for chipselect.
> +- dma-mask: device coherent dma mask.
> +
> +spi0: spi@f0000000 {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	compatible = "atmel,at91rm9200-spi";
> +	reg = <0xf0000000 0x100>;
> +	interrupts = <13 4>;
> +	cs-gpios = <&pioA 14 0
> +		    &pioA 7 0 /* conflicts with TXD2 */
> +		    &pioA 1 0 /* conflicts with RXD0 */
> +		    &pioB 3 0 /* conflicts with ERXDV */
> +		   >;
> +	dma-mask = <0xffffffff>;
> +	status = "disabled";
> +};
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 37f54c3..e032e3d 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -19,6 +19,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/spi/spi.h>
>  #include <linux/slab.h>
> +#include <linux/of.h>
>  
>  #include <asm/io.h>
>  #include <mach/board.h>
> @@ -185,6 +186,10 @@
>   * DMA transfers; transfer queue progress is driven by IRQs.  The clock
>   * framework provides the base clock, subdivided for each spi_device.
>   */
> +struct atmel_spi_pdata {
> +	u8			version;
> +};
> +
>  struct atmel_spi {
>  	spinlock_t		lock;
>  	unsigned long		flags;
> @@ -203,6 +208,7 @@ struct atmel_spi {
>  	struct spi_transfer	*next_transfer;
>  	unsigned long		next_remaining_bytes;
>  	int			done_status;
> +	struct atmel_spi_pdata	*pdata;
>  
>  	void			*buffer;
>  	dma_addr_t		buffer_dma;
> @@ -217,6 +223,51 @@ struct atmel_spi_device {
>  #define BUFFER_SIZE		PAGE_SIZE
>  #define INVALID_DMA_ADDRESS	0xffffffff
>  
> +static struct atmel_spi_pdata at91rm9200_config = {
> +	.version = 1,
> +};
> +
> +static struct atmel_spi_pdata at91sam9260_config = {
> +	.version = 2,
> +};
> +
> +static struct atmel_spi_pdata at91sam9x5_config = {
> +	.version = 2,
> +};
> +
> +static const struct platform_device_id atmel_spi_devtypes[] = {
> +	{
> +		.name = "spi-at91rm9200",
> +		.driver_data = (unsigned long) &at91rm9200_config,
> +	}, {
> +		.name = "spi-at91sam9260",
> +		.driver_data = (unsigned long) &at91sam9260_config,
> +	}, {
> +		.name = "spi-at91sam9x5",
> +		.driver_data = (unsigned long) &at91sam9x5_config,
> +	}, {
> +		/* sentinel */
> +	}
> +};
> +
> +#if defined(CONFIG_OF)
> +static const struct of_device_id atmel_spi_dt_ids[] = {
> +	{
> +		.compatible = "atmel,at91rm9200-spi",
> +		.data = &at91rm9200_config,
> +	} , {
> +		.compatible = "atmel,at91sam9260-spi",
> +		.data = &at91sam9260_config,
> +	} , {
> +		.compatible = "atmel,at91sam9x5-spi",
> +		.data = &at91sam9x5_config,
> +	}, {
> +		/* sentinel */
> +	}
> +};
> +MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
> +#endif
> +
>  /*
>   * Version 2 of the SPI controller has
>   *  - CR.LASTXFER
> @@ -229,11 +280,15 @@ struct atmel_spi_device {
>   * register, but I haven't checked that it exists on all chips, and
>   * this is cheaper anyway.
>   */
> -static bool atmel_spi_is_v2(void)
> +static bool atmel_spi_is_v2(struct atmel_spi *as)
>  {
> -	return !cpu_is_at91rm9200();
> +	if (as->pdata->version == 2)
> +		return true;
> +	else
> +		return false;
>  }
>  
> +
>  /*
>   * Earlier SPI controllers (e.g. on at91rm9200) have a design bug whereby
>   * they assume that spi slave device state will not change on deselect, so
> @@ -265,7 +320,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
>  	unsigned active = spi->mode & SPI_CS_HIGH;
>  	u32 mr;
>  
> -	if (atmel_spi_is_v2()) {
> +	if (atmel_spi_is_v2(as)) {
>  		/*
>  		 * Always use CSR0. This ensures that the clock
>  		 * switches to the correct idle polarity before we
> @@ -320,7 +375,7 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
>  			asd->npcs_pin, active ? " (low)" : "",
>  			mr);
>  
> -	if (atmel_spi_is_v2() || spi->chip_select != 0)
> +	if (atmel_spi_is_v2(as) || spi->chip_select != 0)
>  		gpio_set_value(asd->npcs_pin, !active);
>  }
>  
> @@ -710,7 +765,7 @@ static int atmel_spi_setup(struct spi_device *spi)
>  	u32			scbr, csr;
>  	unsigned int		bits = spi->bits_per_word;
>  	unsigned long		bus_hz;
> -	unsigned int		npcs_pin;
> +	int			npcs_pin;
>  	int			ret;
>  
>  	as = spi_master_get_devdata(spi->master);
> @@ -733,7 +788,7 @@ static int atmel_spi_setup(struct spi_device *spi)
>  	}
>  
>  	/* see notes above re chipselect */
> -	if (!atmel_spi_is_v2()
> +	if (!atmel_spi_is_v2(as)
>  			&& spi->chip_select == 0
>  			&& (spi->mode & SPI_CS_HIGH)) {
>  		dev_dbg(&spi->dev, "setup: can't be active-high\n");
> @@ -742,7 +797,7 @@ static int atmel_spi_setup(struct spi_device *spi)
>  
>  	/* v1 chips start out at half the peripheral bus speed. */
>  	bus_hz = clk_get_rate(as->clk);
> -	if (!atmel_spi_is_v2())
> +	if (!atmel_spi_is_v2(as))
>  		bus_hz /= 2;
>  
>  	if (spi->max_speed_hz) {
> @@ -782,7 +837,9 @@ static int atmel_spi_setup(struct spi_device *spi)
>  	csr |= SPI_BF(DLYBCT, 0);
>  
>  	/* chipselect must have been muxed as GPIO (e.g. in board setup) */
> -	npcs_pin = (unsigned int)spi->controller_data;
> +	if (!gpio_is_valid(spi->cs_gpio))
> +		spi->cs_gpio = (int)spi->controller_data;
> +	npcs_pin = spi->cs_gpio;
>  	asd = spi->controller_state;
>  	if (!asd) {
>  		asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL);
> @@ -812,7 +869,7 @@ static int atmel_spi_setup(struct spi_device *spi)
>  		"setup: %lu Hz bpw %u mode 0x%x -> csr%d %08x\n",
>  		bus_hz / scbr, bits, spi->mode, spi->chip_select, csr);
>  
> -	if (!atmel_spi_is_v2())
> +	if (!atmel_spi_is_v2(as))
>  		spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
>  
>  	return 0;
> @@ -899,7 +956,7 @@ static void atmel_spi_cleanup(struct spi_device *spi)
>  {
>  	struct atmel_spi	*as = spi_master_get_devdata(spi->master);
>  	struct atmel_spi_device	*asd = spi->controller_state;
> -	unsigned		gpio = (unsigned) spi->controller_data;
> +	unsigned		gpio = spi->cs_gpio;
>  
>  	if (!asd)
>  		return;
> @@ -916,6 +973,21 @@ static void atmel_spi_cleanup(struct spi_device *spi)
>  	kfree(asd);
>  }
>  
> +static struct atmel_spi_pdata * __devinit atmel_spi_get_driver_data(
> +					struct platform_device *pdev)
> +{
> +	if (pdev->dev.of_node) {
> +		const struct of_device_id *match;
> +		match = of_match_node(atmel_spi_dt_ids, pdev->dev.of_node);
> +		if (!match)
> +			return NULL;
> +		return (struct atmel_spi_pdata *) match->data;
> +	}
> +
> +	return (struct atmel_spi_pdata *)
> +			platform_get_device_id(pdev)->driver_data;
> +}
> +
>  /*-------------------------------------------------------------------------*/
>  
>  static int __devinit atmel_spi_probe(struct platform_device *pdev)
> @@ -949,7 +1021,8 @@ static int __devinit atmel_spi_probe(struct platform_device *pdev)
>  	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
>  
>  	master->bus_num = pdev->id;
> -	master->num_chipselect = 4;
> +	master->dev.of_node = pdev->dev.of_node;
> +	master->num_chipselect = master->dev.of_node ? 0 : 4;
>  	master->setup = atmel_spi_setup;
>  	master->transfer = atmel_spi_transfer;
>  	master->cleanup = atmel_spi_cleanup;
> @@ -981,6 +1054,10 @@ static int __devinit atmel_spi_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto out_unmap_regs;
>  
> +	as->pdata = atmel_spi_get_driver_data(pdev);
> +	if (!as->pdata)
> +		goto out_unmap_regs;
> +
>  	/* Initialize the hardware */
>  	clk_enable(clk);
>  	spi_writel(as, CR, SPI_BIT(SWRST));
> @@ -1078,12 +1155,13 @@ static int atmel_spi_resume(struct platform_device *pdev)
>  #define	atmel_spi_resume	NULL
>  #endif
>  
> -
>  static struct platform_driver atmel_spi_driver = {
>  	.driver		= {
>  		.name	= "atmel_spi",
>  		.owner	= THIS_MODULE,
> +		.of_match_table	= of_match_ptr(atmel_spi_dt_ids),
>  	},
> +	.id_table	= atmel_spi_devtypes,
>  	.suspend	= atmel_spi_suspend,
>  	.resume		= atmel_spi_resume,
>  	.probe		= atmel_spi_probe,
> -- 
> 1.7.9.5
> 
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