[PATCH v2 3/3] mmc: sdhci-esdhc-imx: add device tree probe support
Shawn Guo
shawn.guo at linaro.org
Tue Jul 5 11:26:08 EDT 2011
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 | 102 +++++++++++++++++++-
2 files changed, 137 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..351d239
--- /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:
+ "none" : No CD
+ "controller" : Uses eSDHC controller internal CD signal
+ "gpio" : Uses GPIO pin for CD
+ "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
+- gpios : Should specify GPIOs in this order: CD GPIO, WP GPIO, if
+ properties cd-type and wp-type are "gpio".
+
+Examples:
+
+esdhc at 70004000 {
+ compatible = "fsl,imx51-esdhc";
+ reg = <0x70004000 0x4000>;
+ interrupts = <1>;
+ fsl,cd-type = "controller";
+ fsl,wp-type = "controller";
+};
+
+esdhc at 70008000 {
+ compatible = "fsl,imx51-esdhc";
+ reg = <0x70008000 0x4000>;
+ interrupts = <2>;
+ fsl,cd-type = "gpio";
+ fsl,wp-type = "gpio";
+ 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 1edda29..593d6b9 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"
@@ -72,6 +75,14 @@ static struct platform_device_id 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 inline int is_imx25_esdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX25_ESDHC;
@@ -305,24 +316,96 @@ static irqreturn_t cd_irq(int irq, void *data)
return IRQ_HANDLED;
};
+#ifdef CONFIG_OF
+static const char *cd_types[] = {
+ [ESDHC_CD_NONE] = "none",
+ [ESDHC_CD_CONTROLLER] = "controller",
+ [ESDHC_CD_GPIO] = "gpio",
+ [ESDHC_CD_PERMANENT] = "permanent",
+};
+
+static const char *wp_types[] = {
+ [ESDHC_WP_NONE] = "none",
+ [ESDHC_WP_CONTROLLER] = "controller",
+ [ESDHC_WP_GPIO] = "gpio",
+};
+
+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, *wp;
+
+ 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, "fsl,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, "fsl,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 = 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;
@@ -416,12 +499,17 @@ 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;
@@ -444,6 +532,9 @@ static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
sdhci_pltfm_free(pdev);
+ if (np)
+ kfree(boarddata);
+
return 0;
}
@@ -451,6 +542,7 @@ 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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