[PATCH 26/29] usb: otg: mv_otg: add device tree support
Chao Xie
xiechao.mail at gmail.com
Wed Nov 21 21:05:07 EST 2012
From: Chao Xie <chao.xie at marvell.com>
Signed-off-by: Chao Xie <xiechao.mail at gmail.com>
---
drivers/usb/otg/mv_otg.c | 127 +++++++++++++++++++++++++++++++++++++--------
drivers/usb/otg/mv_otg.h | 6 +-
2 files changed, 107 insertions(+), 26 deletions(-)
diff --git a/drivers/usb/otg/mv_otg.c b/drivers/usb/otg/mv_otg.c
index bd6369c..887024c 100644
--- a/drivers/usb/otg/mv_otg.c
+++ b/drivers/usb/otg/mv_otg.c
@@ -17,6 +17,7 @@
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
+#include <linux/of.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
@@ -333,7 +334,7 @@ static void mv_otg_update_inputs(struct mv_otg *mvotg)
else
otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
- if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
+ if (mvotg->otg_force_a_bus_req && !otg_ctrl->id)
otg_ctrl->a_bus_req = 1;
otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
@@ -690,21 +691,69 @@ int mv_otg_remove(struct platform_device *pdev)
return 0;
}
+static int mv_otg_parse_dt(struct platform_device *pdev,
+ struct mv_otg *mvotg)
+{
+ struct device_node *np = pdev->dev.of_node;
+ unsigned int clks_num;
+ unsigned int val;
+ int i, ret;
+ const char *clk_name;
+
+ if (!np)
+ return 1;
+
+ clks_num = of_property_count_strings(np, "clocks");
+ if (clks_num < 0)
+ return clks_num;
+
+ mvotg->clk = devm_kzalloc(&pdev->dev,
+ sizeof(struct clk *) * clks_num, GFP_KERNEL);
+ if (mvotg->clk == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < clks_num; i++) {
+ ret = of_property_read_string_index(np, "clocks", i,
+ &clk_name);
+ if (ret)
+ return ret;
+ mvotg->clk[i] = devm_clk_get(&pdev->dev, clk_name);
+ if (IS_ERR(mvotg->clk[i]))
+ return PTR_ERR(mvotg->clk[i]);
+ }
+
+ mvotg->clknum = clks_num;
+
+ ret = of_property_read_u32(np, "extern_attr", &mvotg->extern_attr);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(np, "mode", &mvotg->mode);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(np, "force_a_bus_req", &val);
+ if (ret)
+ return ret;
+ mvotg->otg_force_a_bus_req = !!val;
+
+ ret = of_property_read_u32(np, "disable_clock_gating", &val);
+ if (ret)
+ return ret;
+ mvotg->clock_gating = !val;
+
+ return 0;
+}
+
static int mv_otg_probe(struct platform_device *pdev)
{
- struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
struct mv_otg *mvotg;
struct usb_otg *otg;
struct resource *r;
- int retval = 0, clk_i, i;
+ int retval = 0, i;
size_t size;
- if (pdata == NULL) {
- dev_err(&pdev->dev, "failed to get platform data\n");
- return -ENODEV;
- }
-
- size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
+ size = sizeof(*mvotg);
mvotg = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!mvotg) {
dev_err(&pdev->dev, "failed to allocate memory!\n");
@@ -718,17 +767,45 @@ static int mv_otg_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, mvotg);
mvotg->pdev = pdev;
- mvotg->extern_attr = pdata->extern_attr;
- mvotg->pdata = pdata;
- mvotg->clknum = pdata->clknum;
- for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
- mvotg->clk[clk_i] = devm_clk_get(&pdev->dev,
+ retval = mv_otg_parse_dt(pdev, mvotg);
+ if (retval > 0) {
+ struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
+ /* no CONFIG_OF */
+ int clk_i = 0;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "missing platform_data\n");
+ return -ENODEV;
+ }
+ mvotg->extern_attr = pdata->extern_attr;
+ mvotg->mode = pdata->mode;
+ mvotg->clknum = pdata->clknum;
+ mvotg->otg_force_a_bus_req = pdata->otg_force_a_bus_req;
+ if (pdata->disable_otg_clock_gating)
+ mvotg->clock_gating = 0;
+
+ size = sizeof(struct clk *) * mvotg->clknum;
+ mvotg->clk = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+ if (mvotg->clk == NULL) {
+ dev_err(&pdev->dev,
+ "failed to allocate memory for clk\n");
+ return -ENOMEM;
+ }
+
+ for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
+ mvotg->clk[clk_i] = devm_clk_get(&pdev->dev,
pdata->clkname[clk_i]);
- if (IS_ERR(mvotg->clk[clk_i])) {
- retval = PTR_ERR(mvotg->clk[clk_i]);
- return retval;
+ if (IS_ERR(mvotg->clk[clk_i])) {
+ dev_err(&pdev->dev, "failed to get clk %s\n",
+ pdata->clkname[clk_i]);
+ retval = PTR_ERR(mvotg->clk[clk_i]);
+ return retval;
+ }
}
+ } else if (retval < 0) {
+ dev_err(&pdev->dev, "error parse dt\n");
+ return retval;
}
mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
@@ -770,6 +847,7 @@ static int mv_otg_probe(struct platform_device *pdev)
}
mvotg->mvphy = mv_usb2_get_phy();
if (mvotg->mvphy == NULL) {
+ dev_err(&pdev->dev, "failed to get usb phy\n");
retval = -ENODEV;
goto err_destroy_workqueue;
}
@@ -791,9 +869,6 @@ static int mv_otg_probe(struct platform_device *pdev)
mv_usb2_register_notifier(mvotg->mvphy, &mvotg->notifier);
}
- if (pdata->disable_otg_clock_gating)
- mvotg->clock_gating = 0;
-
mv_otg_reset(mvotg);
mv_otg_init_irq(mvotg);
@@ -892,13 +967,19 @@ static int mv_otg_resume(struct platform_device *pdev)
}
#endif
+static struct of_device_id mv_otg_dt_ids[] = {
+ { .compatible = "mrvl,mv-otg" },
+};
+MODULE_DEVICE_TABLE(of, mv_otg_dt_ids);
+
static struct platform_driver mv_otg_driver = {
.probe = mv_otg_probe,
.remove = __exit_p(mv_otg_remove),
.driver = {
- .owner = THIS_MODULE,
- .name = driver_name,
- },
+ .owner = THIS_MODULE,
+ .name = driver_name,
+ .of_match_table = mv_otg_dt_ids,
+ },
#ifdef CONFIG_PM
.suspend = mv_otg_suspend,
.resume = mv_otg_resume,
diff --git a/drivers/usb/otg/mv_otg.h b/drivers/usb/otg/mv_otg.h
index f5bc7dd..3b9356d 100644
--- a/drivers/usb/otg/mv_otg.h
+++ b/drivers/usb/otg/mv_otg.h
@@ -157,12 +157,12 @@ struct mv_otg {
spinlock_t wq_lock;
- struct mv_usb_platform_data *pdata;
-
unsigned int active;
unsigned int clock_gating;
+ unsigned int mode;
+ unsigned int otg_force_a_bus_req;
unsigned int clknum;
- struct clk *clk[0];
+ struct clk **clk;
};
#endif
--
1.7.4.1
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