[PATCH 3/3] mmc: sdhci-esdhc-imx: add device tree probe support
Grant Likely
grant.likely at secretlab.ca
Mon Jul 4 02:25:48 EDT 2011
On Sun, Jul 03, 2011 at 04:30:51PM +0800, Shawn Guo wrote:
> The patch adds device tree probe support for sdhci-esdhc-imx driver.
>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> Cc: Wolfram Sang <w.sang at pengutronix.de>
> Cc: Chris Ball <cjb at laptop.org>
> Cc: Grant Likely <grant.likely at secretlab.ca>
> ---
> .../devicetree/bindings/mmc/fsl-imx-esdhc.txt | 40 ++++++++
> drivers/mmc/host/sdhci-esdhc-imx.c | 99 +++++++++++++++++++-
> 2 files changed, 134 insertions(+), 5 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
>
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> new file mode 100644
> index 0000000..e182e7c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> @@ -0,0 +1,40 @@
> +* Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
> +
> +The Enhanced Secure Digital Host Controller on Freescale i.MX family
> +provides an interface for MMC, SD, and SDIO types of memory cards.
> +
> +Required properties:
> +- compatible : Should be "fsl,<chip>-esdhc"
> +- reg : Should contain eSDHC registers location and length
> +- interrupts : Should contain eSDHC interrupt
> +- cd-type : String, card detection (CD) method. Supported values are:
Similar to previous comments, use the "fsl," prefix to this property name.
> + "none" : No CD
> + "controller" : Uses eSDHC controller internal CD signal
> + "gpio" : Uses GPIO pin for CD
I would say the presence of a "cd-gpios" property would implicitly
mean gpio is to be used for the CD pin.
> + "permanent" : No CD because card is permanently wired to host
> +- wp-type : String, write protection (WP) method. Supported values are:
> + "none" : No WP
> + "controller" : Uses eSDHC controller internal WP signal
> + "gpio" : Uses GPIO pin for WP
Ditto comments here.
> +- gpios : Should specify GPIOs in this order: CD GPIO, WP GPIO, if
> + properties cd-type and wp-type are "gpio".
The gpios binding has been extended to allow named gpios now. You can
uses something like "cd-gpios" and "wp-gpios".
> +
> +Examples:
> +
> +esdhc at 70004000 {
> + compatible = "fsl,imx51-esdhc";
> + reg = <0x70004000 0x4000>;
> + interrupts = <1>;
> + cd-type = "controller";
> + wp-type = "controller";
> +};
> +
> +esdhc at 70008000 {
> + compatible = "fsl,imx51-esdhc";
> + reg = <0x70008000 0x4000>;
> + interrupts = <2>;
> + cd-type = "gpio";
> + wp-type = "gpio";
> + gpios = <&gpio0 6 0>, /* CD, GPIO1_6 */
> + <&gpio0 5 0>; /* WP, GPIO1_5 */
> +};
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 705d670..57793e3 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -20,6 +20,9 @@
> #include <linux/mmc/host.h>
> #include <linux/mmc/mmc.h>
> #include <linux/mmc/sdio.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> #include <mach/esdhc.h>
> #include "sdhci-pltfm.h"
> #include "sdhci-esdhc.h"
> @@ -78,6 +81,14 @@ static struct platform_device_id imx_esdhc_devtype[] = {
> };
> MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);
>
> +static const struct of_device_id imx_esdhc_dt_ids[] = {
> + { .compatible = "fsl,imx25-esdhc", .data = &imx_esdhc_devtype[IMX25_ESDHC], },
> + { .compatible = "fsl,imx35-esdhc", .data = &imx_esdhc_devtype[IMX35_ESDHC], },
> + { .compatible = "fsl,imx51-esdhc", .data = &imx_esdhc_devtype[IMX51_ESDHC], },
> + { .compatible = "fsl,imx53-esdhc", .data = &imx_esdhc_devtype[IMX53_ESDHC], },
> + { /* sentinel */ },
> +};
> +
> static unsigned int esdhc_pltfm_get_max_blk_size(struct sdhci_host *host)
> {
> /* Force 2048 bytes, which is the maximum supported size in SDHCI. */
> @@ -290,24 +301,93 @@ static irqreturn_t cd_irq(int irq, void *data)
> return IRQ_HANDLED;
> };
>
> +#ifdef CONFIG_OF
> +static int __devinit sdhci_esdhc_imx_probe_dt(struct platform_device *pdev)
> +{
> + const struct of_device_id *of_id =
> + of_match_device(imx_esdhc_dt_ids, &pdev->dev);
> + struct device_node *np = pdev->dev.of_node;
> + struct esdhc_platform_data *boarddata;
> + int err, i;
> + const char *cd, *cd_types[] = {
> + [ESDHC_CD_NONE] = "none",
> + [ESDHC_CD_CONTROLLER] = "controller",
> + [ESDHC_CD_GPIO] = "gpio",
> + [ESDHC_CD_PERMANENT] = "permanent",
> + };
> + const char *wp, *wp_types[] = {
> + [ESDHC_WP_NONE] = "none",
> + [ESDHC_WP_CONTROLLER] = "controller",
> + [ESDHC_WP_GPIO] = "gpio",
> + };
> +
> + if (!np)
> + return -ENODEV;
> +
> + boarddata = kzalloc(sizeof(*boarddata), GFP_KERNEL);
> + if (!boarddata)
> + return -ENOMEM;
> + pdev->dev.platform_data = boarddata;
> +
> + err = of_property_read_string(np, "cd-type", &cd);
> + if (err)
> + return err;
> + for (i = 0; i < ARRAY_SIZE(cd_types); i++)
> + if (!strcasecmp(cd, cd_types[i])) {
> + boarddata->cd_type = i;
> + break;
> + }
> +
> + err = of_property_read_string(np, "wp-type", &wp);
> + if (err)
> + return err;
> + for (i = 0; i < ARRAY_SIZE(wp_types); i++)
> + if (!strcasecmp(wp, wp_types[i])) {
> + boarddata->wp_type = i;
> + break;
> + }
> +
> + boarddata->cd_gpio = of_get_gpio(np, 0);
> + boarddata->wp_gpio = of_get_gpio(np, 1);
> +
> + pdev->id_entry = (struct platform_device_id *) of_id->data;
> +
> + return 0;
> +}
> +#else
> +static inline int sdhci_esdhc_imx_probe_dt(struct platform_device *pdev)
> +{
> + return 0;
> +}
> +#endif
> +
> static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
> {
> + struct device_node *np = pdev->dev.of_node;
> struct sdhci_pltfm_host *pltfm_host;
> struct sdhci_host *host;
> - struct esdhc_platform_data *boarddata;
> + struct esdhc_platform_data *boarddata = NULL;
> struct clk *clk;
> int err;
> struct pltfm_imx_data *imx_data;
>
> + err = sdhci_esdhc_imx_probe_dt(pdev);
> + if (err)
> + return err;
> +
> host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata);
> - if (IS_ERR(host))
> - return PTR_ERR(host);
> + if (IS_ERR(host)) {
> + err = PTR_ERR(host);
> + goto err_sdhci_pltfm;
> + }
>
> pltfm_host = sdhci_priv(host);
>
> imx_data = kzalloc(sizeof(struct pltfm_imx_data), GFP_KERNEL);
> - if (!imx_data)
> - return -ENOMEM;
> + if (!imx_data) {
> + err = -ENOMEM;
> + goto err_imx_data;
> + }
>
> imx_data->devtype = pdev->id_entry->driver_data;
> pltfm_host->priv = imx_data;
> @@ -401,12 +481,17 @@ no_board_data:
> clk_put(pltfm_host->clk);
> err_clk_get:
> kfree(imx_data);
> +err_imx_data:
> sdhci_pltfm_free(pdev);
> +err_sdhci_pltfm:
> + if (np)
> + kfree(boarddata);
> return err;
> }
>
> static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
> {
> + struct device_node *np = pdev->dev.of_node;
> struct sdhci_host *host = platform_get_drvdata(pdev);
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data;
> @@ -429,6 +514,9 @@ static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
>
> sdhci_pltfm_free(pdev);
>
> + if (np)
> + kfree(boarddata);
> +
> return 0;
> }
>
> @@ -436,6 +524,7 @@ static struct platform_driver sdhci_esdhc_imx_driver = {
> .driver = {
> .name = "sdhci-esdhc-imx",
> .owner = THIS_MODULE,
> + .of_match_table = imx_esdhc_dt_ids,
> },
> .id_table = imx_esdhc_devtype,
> .probe = sdhci_esdhc_imx_probe,
> --
> 1.7.4.1
>
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