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usb: musb: ux500: add device tree probing support

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This patch will allow ux500-musb to be probed and configured solely from
configuration found in Device Tree.

Cc: Rob Herring <[email protected]>
Cc: [email protected]
Cc: [email protected]
Acked-by: Felipe Balbi <[email protected]>
Acked-by: Fabio Baltieri <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Lee Jones 2013-05-15 10:51:48 +01:00 • committed by Linus Walleij
commit 313bdb11e5
2 changed files with 101 additions and 0 deletions
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51
drivers/usb/musb/ux500.c
View file

@ -25,6 +25,7 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/musb-ux500.h>
@ -194,14 +195,57 @@ static const struct musb_platform_ops ux500_ops = {
.set_vbus = ux500_musb_set_vbus,
};
static struct musb_hdrc_platform_data *
ux500_of_probe(struct platform_device *pdev, struct device_node *np)
{
struct musb_hdrc_platform_data *pdata;
const char *mode;
int strlen;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
mode = of_get_property(np, "dr_mode", &strlen);
if (!mode) {
dev_err(&pdev->dev, "No 'dr_mode' property found\n");
return NULL;
}
if (strlen > 0) {
if (!strcmp(mode, "host"))
pdata->mode = MUSB_HOST;
if (!strcmp(mode, "otg"))
pdata->mode = MUSB_OTG;
if (!strcmp(mode, "peripheral"))
pdata->mode = MUSB_PERIPHERAL;
}
return pdata;
}
static int ux500_probe(struct platform_device *pdev)
{
struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
struct device_node *np = pdev->dev.of_node;
struct platform_device *musb;
struct ux500_glue *glue;
struct clk *clk;
int ret = -ENOMEM;
if (!pdata) {
if (np) {
pdata = ux500_of_probe(pdev, np);
if (!pdata)
goto err0;
pdev->dev.platform_data = pdata;
} else {
dev_err(&pdev->dev, "no pdata or device tree found\n");
goto err0;
}
}
glue = kzalloc(sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&pdev->dev, "failed to allocate glue context\n");
@ -230,6 +274,7 @@ static int ux500_probe(struct platform_device *pdev)
musb->dev.parent = &pdev->dev;
musb->dev.dma_mask = &pdev->dev.coherent_dma_mask;
musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
musb->dev.of_node = pdev->dev.of_node;
glue->dev = &pdev->dev;
glue->musb = musb;
@ -328,12 +373,18 @@ static const struct dev_pm_ops ux500_pm_ops = {
#define DEV_PM_OPS NULL
#endif
static const struct of_device_id ux500_match[] = {
{ .compatible = "stericsson,db8500-musb", },
{}
};
static struct platform_driver ux500_driver = {
.probe = ux500_probe,
.remove = ux500_remove,
.driver = {
.name = "musb-ux500",
.pm = DEV_PM_OPS,
.of_match_table = ux500_match,
},
};