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SubjectRe: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support
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Dear Dong Aisheng,

> From: Dong Aisheng <dong.aisheng@linaro.org>
>
> Signed-off-by: Dong Aisheng <dong.aisheng@linaro.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@80010000 {
> + 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;
> +
> + pdata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
> +
> + dev_dbg(&pdev->dev, "wp-gpios %d flags %d\n", pdata->wp_gpio,
> + pdata->flags);
> +
> + return 0;
> +}
> +#else
> +static struct resource * __devinit mxs_mmc_get_of_dmares(
> + struct platform_device *pdev)
> +{
> + return NULL;
> +}
> +static inline int mxs_mmc_get_of_property(struct platform_device *pdev,
> + struct mxs_mmc_platform_data *pdata)
> +{
> + return -ENODEV;
> +}
> +#endif
> +
> static int mxs_mmc_probe(struct platform_device *pdev)
> {
> struct mxs_mmc_host *host;
> struct mmc_host *mmc;
> struct resource *iores, *dmares, *r;
> - struct mxs_mmc_platform_data *pdata;
> + struct mxs_mmc_platform_data *pdata = NULL;
> int ret = 0, irq_err, irq_dma;
> dma_cap_mask_t mask;
>
> iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> + dmares = mxs_mmc_get_of_dmares(pdev);
> + if (dmares == NULL)
> + dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> irq_err = platform_get_irq(pdev, 0);
> irq_dma = platform_get_irq(pdev, 1);
> if (!iores || !dmares || irq_err < 0 || irq_dma < 0)
> @@ -740,7 +806,9 @@ static int mxs_mmc_probe(struct platform_device *pdev)
> mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
> MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL;
>
> - pdata = mmc_dev(host->mmc)->platform_data;
> + mxs_mmc_get_of_property(pdev, &pdata);
> + if (pdata == NULL)
> + pdata = mmc_dev(host->mmc)->platform_data;
> if (pdata) {
> if (pdata->flags & SLOTF_8_BIT_CAPABLE)
> mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
> @@ -851,6 +919,13 @@ static const struct dev_pm_ops mxs_mmc_pm_ops = {
> };
> #endif
>
> +static const struct of_device_id mxs_mmc_dt_ids[] = {
> + { .compatible = "fsl,imx23-mmc", .data = NULL, },
> + { .compatible = "fsl,imx28-mmc", .data = NULL, },

Do you really need two distinct ones here?

> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids);
> +
> static struct platform_driver mxs_mmc_driver = {
> .probe = mxs_mmc_probe,
> .remove = mxs_mmc_remove,
> @@ -860,6 +935,7 @@ static struct platform_driver mxs_mmc_driver = {
> #ifdef CONFIG_PM
> .pm = &mxs_mmc_pm_ops,
> #endif
> + .of_match_table = mxs_mmc_dt_ids,
> },
> };


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