As we mark mxs-phy as dummy clock for i.mx6q, we only need to
enable it at probe, this clock doesn't need to be managed
by clock framework.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/otg/mxs-phy.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/otg/mxs-phy.c b/drivers/usb/otg/mxs-phy.c
index 7630272..7dca384 100644
--- a/drivers/usb/otg/mxs-phy.c
+++ b/drivers/usb/otg/mxs-phy.c
@@ -20,6 +20,9 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
#define DRIVER_NAME "mxs_phy"
@@ -108,6 +111,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
void __iomem *base;
struct clk *clk;
struct mxs_phy *mxs_phy;
+ struct regmap *anatop;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@@ -146,6 +150,46 @@ static int mxs_phy_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, &mxs_phy->phy);
+ /*
+ * At mx6x, USB PHY PLL and its output gate is controlled by hardware.
+ * It just needs to open at init, if the usb device is
+ * in suspend, it will close related PLL automatically.
+ */
+
+ anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
+
+#define CTRL_SET 0x4
+#define CTRL_CLR 0x8
+
+#define BM_ANADIG_USB_PLL_480_CTRL_BYPASS (1 << 16)
+#define BM_ANADIG_USB_PLL_480_CTRL_ENABLE (1 << 13)
+#define BM_ANADIG_USB_PLL_480_CTRL_POWER (1 << 12)
+#define BM_ANADIG_USB_PLL_480_CTRL_EN_USB_CLKS (1 << 6)
+
+ if (!IS_ERR(anatop)) {
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ u32 phy_reg_offset;
+ int ret;
+
+ ret = of_property_read_u32(np, "anatop-phy-reg-offset",
+ &phy_reg_offset);
+ if (ret) {
+ dev_err(dev, "no anatop-phy-reg-offset property set\n");
+ return -EINVAL;
+ }
+
+ regmap_write(anatop, phy_reg_offset + 0x8,
+ BM_ANADIG_USB_PLL_480_CTRL_BYPASS);
+ regmap_write(anatop, phy_reg_offset + 0x4,
+ BM_ANADIG_USB_PLL_480_CTRL_ENABLE
+ | BM_ANADIG_USB_PLL_480_CTRL_POWER
+ | BM_ANADIG_USB_PLL_480_CTRL_EN_USB_CLKS);
+
+ } else {
+ pr_warn("failed to find fsl,imx6q-anatop regmap\n");
+ }
+
return 0;
}
--
1.7.0.4
--
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