mmc: omap_hsmmc: Convert hsmmc driver to use device tree
Define dt bindings for the ti-omap-hsmmc, and adapt the driver to extract
data (which was earlier passed as platform_data) from device tree.
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 0306aea..e0808d4 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -26,6 +26,9 @@
#include <linux/platform_device.h>
#include <linux/timer.h>
#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
#include <linux/mmc/host.h>
#include <linux/mmc/core.h>
#include <linux/mmc/mmc.h>
@@ -1710,6 +1713,65 @@
#endif
+#ifdef CONFIG_OF
+static u16 omap4_reg_offset = 0x100;
+
+static const struct of_device_id omap_mmc_of_match[] = {
+ {
+ .compatible = "ti,omap2-hsmmc",
+ },
+ {
+ .compatible = "ti,omap3-hsmmc",
+ },
+ {
+ .compatible = "ti,omap4-hsmmc",
+ .data = &omap4_reg_offset,
+ },
+ {},
+}
+MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
+
+static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
+{
+ struct omap_mmc_platform_data *pdata;
+ struct device_node *np = dev->of_node;
+ u32 bus_width;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL; /* out of memory */
+
+ if (of_find_property(np, "ti,dual-volt", NULL))
+ pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
+
+ /* This driver only supports 1 slot */
+ pdata->nr_slots = 1;
+ pdata->slots[0].switch_pin = of_get_named_gpio(np, "cd-gpios", 0);
+ pdata->slots[0].gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
+
+ if (of_find_property(np, "ti,non-removable", NULL)) {
+ pdata->slots[0].nonremovable = true;
+ pdata->slots[0].no_regulator_off_init = true;
+ }
+ of_property_read_u32(np, "ti,bus-width", &bus_width);
+ if (bus_width == 4)
+ pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
+ else if (bus_width == 8)
+ pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
+
+ if (of_find_property(np, "ti,needs-special-reset", NULL))
+ pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
+
+ return pdata;
+}
+#else
+static inline struct omap_mmc_platform_data
+ *of_get_hsmmc_pdata(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
static int __init omap_hsmmc_probe(struct platform_device *pdev)
{
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
@@ -1717,6 +1779,16 @@
struct omap_hsmmc_host *host = NULL;
struct resource *res;
int ret, irq;
+ const struct of_device_id *match;
+
+ match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
+ if (match) {
+ pdata = of_get_hsmmc_pdata(&pdev->dev);
+ if (match->data) {
+ u16 *offsetp = match->data;
+ pdata->reg_offset = *offsetp;
+ }
+ }
if (pdata == NULL) {
dev_err(&pdev->dev, "Platform Data is missing\n");
@@ -2122,6 +2194,7 @@
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.pm = &omap_hsmmc_dev_pm_ops,
+ .of_match_table = of_match_ptr(omap_mmc_of_match),
},
};