mmc: sdhci-esdhc-imx: add device tree probe support

The patch adds device tree probe support for sdhci-esdhc-imx driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: Chris Ball <cjb@laptop.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Chris Ball <cjb@laptop.org>

2 files changed, 103 insertions, 9 deletions

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 000000000000..ab22fe6e73ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
@@ -0,0 +1,34 @@
+* 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
+
+Optional properties:
+- fsl,card-wired : Indicate the card is wired to host permanently
+- fsl,cd-internal : Indicate to use controller internal card detection
+- fsl,wp-internal : Indicate to use controller internal write protection
+- cd-gpios : Specify GPIOs for card detection
+- wp-gpios : Specify GPIOs for write protection
+
+Examples:
+
+esdhc@70004000 {
+        compatible = "fsl,imx51-esdhc";
+        reg = <0x70004000 0x4000>;
+        interrupts = <1>;
+        fsl,cd-internal;
+        fsl,wp-internal;
+};
+
+esdhc@70008000 {
+        compatible = "fsl,imx51-esdhc";
+        reg = <0x70008000 0x4000>;
+        interrupts = <2>;
+        cd-gpios = <&gpio0 6 0>; /* GPIO1_6 */
+        wp-gpios = <&gpio0 5 0>; /* GPIO1_5 */
+};
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index a0d0da4d9bc8..9ebfb4b482f5 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"
@@ -74,6 +77,15 @@ 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 */ }
+};
+MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
+
 static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
 {
         return data->devtype == IMX25_ESDHC;
@@ -290,8 +302,48 @@ 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,
+                         struct esdhc_platform_data *boarddata)
+{
+        struct device_node *np = pdev->dev.of_node;
+
+        if (!np)
+                return -ENODEV;
+
+        if (of_get_property(np, "fsl,card-wired", NULL))
+                boarddata->cd_type = ESDHC_CD_PERMANENT;
+
+        if (of_get_property(np, "fsl,cd-controller", NULL))
+                boarddata->cd_type = ESDHC_CD_CONTROLLER;
+
+        if (of_get_property(np, "fsl,wp-controller", NULL))
+                boarddata->wp_type = ESDHC_WP_CONTROLLER;
+
+        boarddata->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
+        if (gpio_is_valid(boarddata->cd_gpio))
+                boarddata->cd_type = ESDHC_CD_GPIO;
+
+        boarddata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
+        if (gpio_is_valid(boarddata->wp_gpio))
+                boarddata->wp_type = ESDHC_WP_GPIO;
+
+        return 0;
+}
+#else
+static inline int
+sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
+                         struct esdhc_platform_data *boarddata)
+{
+        return -ENODEV;
+}
+#endif
+
 static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
 {
+        const struct of_device_id *of_id =
+                        of_match_device(imx_esdhc_dt_ids, &pdev->dev);
         struct sdhci_pltfm_host *pltfm_host;
         struct sdhci_host *host;
         struct esdhc_platform_data *boarddata;
@@ -306,9 +358,13 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
         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;
+        }
 
+        if (of_id)
+                pdev->id_entry = of_id->data;
         imx_data->devtype = pdev->id_entry->driver_data;
         pltfm_host->priv = imx_data;
 
@@ -331,14 +387,16 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
         if (is_imx53_esdhc(imx_data))
                 imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT;
 
-        if (!host->mmc->parent->platform_data) {
-                dev_err(mmc_dev(host->mmc), "no board data!\n");
-                err = -EINVAL;
-                goto no_board_data;
-        }
-        imx_data->boarddata = *((struct esdhc_platform_data *)
-                                host->mmc->parent->platform_data);
         boarddata = &imx_data->boarddata;
+        if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) {
+                if (!host->mmc->parent->platform_data) {
+                        dev_err(mmc_dev(host->mmc), "no board data!\n");
+                        err = -EINVAL;
+                        goto no_board_data;
+                }
+                imx_data->boarddata = *((struct esdhc_platform_data *)
+                                        host->mmc->parent->platform_data);
+        }
 
         /* write_protect */
         if (boarddata->wp_type == ESDHC_WP_GPIO) {
@@ -407,6 +465,7 @@ no_board_data:
         clk_put(pltfm_host->clk);
 err_clk_get:
         kfree(imx_data);
+err_imx_data:
         sdhci_pltfm_free(pdev);
         return err;
 }
@@ -442,6 +501,7 @@ 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,