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phy: usb: sunxi: Introduce Allwinner A31 USB PHY support 

The USB phy controller in the A31 differs mostly from the older controllers
because it has a clock dedicated for each phy, while the older ones were having
a single clock for all the phys.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Maxime Ripard 2014-05-13 17:44:18 +02:00 committed by Kishon Vijay Abraham I
parent fecc2d785b
commit eadd431239
1 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/phy/phy-sun4i-usb.c
View File

@ -61,7 +61,6 @@
#define MAX_PHYS 3
struct sun4i_usb_phy_data {
struct clk *clk;
void __iomem *base;
struct mutex mutex;
int num_phys;
@ -71,6 +70,7 @@ struct sun4i_usb_phy_data {
void __iomem *pmu;
struct regulator *vbus;
struct reset_control *reset;
struct clk *clk;
int index;
} phys[MAX_PHYS];
};
@ -146,13 +146,13 @@ static int sun4i_usb_phy_init(struct phy *_phy)
struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
int ret;
ret = clk_prepare_enable(data->clk);
ret = clk_prepare_enable(phy->clk);
if (ret)
return ret;
ret = reset_control_deassert(phy->reset);
if (ret) {
clk_disable_unprepare(data->clk);
clk_disable_unprepare(phy->clk);
return ret;
}
@ -170,11 +170,10 @@ static int sun4i_usb_phy_init(struct phy *_phy)
static int sun4i_usb_phy_exit(struct phy *_phy)
{
struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
sun4i_usb_phy_passby(phy, 0);
reset_control_assert(phy->reset);
clk_disable_unprepare(data->clk);
clk_disable_unprepare(phy->clk);
return 0;
}
@ -225,6 +224,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct phy_provider *phy_provider;
bool dedicated_clocks;
struct resource *res;
int i;
@ -244,17 +244,16 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
else
data->disc_thresh = 2;
if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
dedicated_clocks = true;
else
dedicated_clocks = false;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
data->base = devm_ioremap_resource(dev, res);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
data->clk = devm_clk_get(dev, "usb_phy");
if (IS_ERR(data->clk)) {
dev_err(dev, "could not get usb_phy clock\n");
return PTR_ERR(data->clk);
}
/* Skip 0, 0 is the phy for otg which is not yet supported. */
for (i = 1; i < data->num_phys; i++) {
struct sun4i_usb_phy *phy = data->phys + i;
@ -268,6 +267,17 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
phy->vbus = NULL;
}
if (dedicated_clocks)
snprintf(name, sizeof(name), "usb%d_phy", i);
else
strlcpy(name, "usb_phy", sizeof(name));
phy->clk = devm_clk_get(dev, name);
if (IS_ERR(phy->clk)) {
dev_err(dev, "failed to get clock %s\n", name);
return PTR_ERR(phy->clk);
}
snprintf(name, sizeof(name), "usb%d_reset", i);
phy->reset = devm_reset_control_get(dev, name);
if (IS_ERR(phy->reset)) {
@ -305,6 +315,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
static const struct of_device_id sun4i_usb_phy_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-usb-phy" },
{ .compatible = "allwinner,sun5i-a13-usb-phy" },
{ .compatible = "allwinner,sun6i-a31-usb-phy" },
{ .compatible = "allwinner,sun7i-a20-usb-phy" },
{ },
};