linux-kernel - Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

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Date:	Wed, 14 Mar 2012 08:23:43 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Dong Aisheng <b29396@...escale.com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	vinod.koul@...ux.intel.com, s.hauer@...gutronix.de,
	rob.herring@...xeda.com, rdunlap@...otime.net,
	kernel@...gutronix.de, cjb@...top.org
Subject: Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

On 16:47 Tue 13 Mar     , Dong Aisheng wrote:
> From: Dong Aisheng <dong.aisheng@...aro.org>
> 
> Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> 
> ---
> The patch is still using a private way for dma part binding
> since the common dma binding is still under discussion.
> http://www.spinics.net/lists/linux-omap/msg65528.html
> 
> Will update to use common dma binding when it hits mainline.
> ---
>  .../devicetree/bindings/mmc/fsl-mxs-mmc.txt        |   23 ++++++
>  drivers/mmc/host/mxs-mmc.c                         |   82 +++++++++++++++++++-
>  2 files changed, 102 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt
> new file mode 100644
> index 0000000..adc1142
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt
> @@ -0,0 +1,23 @@
> +* FREESCALE MXS MMC peripheral
> +
> +Required properties:
> +- compatible : Should be "fsl,<chip>-mmc"
> +- reg : Should contain registers location and length
> +- interrupts : Should contain interrupt.
> +  The format is <irq_err irq_dma>.
> +- dma_channel: Should contain the dma channel it uses
> +
> +Optional properties:
> +- wp-gpios : Specify GPIOs for write protection
> +- slot-4bit: Specify 4 bit mode support
> +- slot-8bit: Specify 8 bit and 4 bit mode support
> +
> +Examples:
> +mmc1: ssp@...10000 {
> +	compatible = "fsl,imx28-mmc";
> +	reg = <0x80010000 2000>;
> +	/* <irq_err irq_dma> */
> +	interrupts = <96 82>;
> +	dma_channel = <0>;
> +	slot-8bit;
> +};
> diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
> index 382c835..6cf2d17 100644
> --- a/drivers/mmc/host/mxs-mmc.c
> +++ b/drivers/mmc/host/mxs-mmc.c
> @@ -38,6 +38,10 @@
>  #include <linux/gpio.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/slab.h>
>  
>  #include <mach/mxs.h>
>  #include <mach/common.h>
> @@ -673,17 +677,79 @@ static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param)
>  	return true;
>  }
>  
> +#ifdef CONFIG_OF
> +static struct resource * __devinit mxs_mmc_get_of_dmares(
> +				struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct resource *dmares;
> +	int ret;
> +
> +	if (!np)
> +		return NULL;
> +
> +	dmares = kzalloc(sizeof(*dmares), GFP_KERNEL);
> +	dmares->flags = IORESOURCE_DMA;
> +	ret = of_property_read_u32(np, "dma_channel", &dmares->start);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to get dmares from dt\n");
> +		return NULL;
> +	}
> +	dmares->end = dmares->start;
> +
> +	return dmares;
> +}
> +
> +static int __devinit mxs_mmc_get_of_property(struct platform_device *pdev,
> +				struct mxs_mmc_platform_data **ppdata)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct mxs_mmc_platform_data *pdata = *ppdata;
> +
> +	if (!np)
> +		return -ENODEV;
> +
> +	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> +
> +	if (of_get_property(np, "slot-8bit", NULL))
> +		pdata->flags |= SLOTF_8_BIT_CAPABLE;
> +
> +	if (of_get_property(np, "slot-4bit", NULL))
> +		pdata->flags |= SLOTF_4_BIT_CAPABLE;
it will conflit if both binding are set use a number instead

Best Regards,
J.
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