The RZ/A2 has an optional dedicated 48MHz clock input for the PLL.
If a clock node named 'usb_x1' exists and set to non-zero, then we can
assume we want it use it.
Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
v4:
* added reviewed-by
v3:
* avoid magic number
* use devm_clk_get and clk_get_rate
v2:
* use 'usb_x1' clock node instead of 'renesas,uses_usb_x1' property
---
drivers/phy/renesas/phy-rcar-gen3-usb2.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 1322185a00a2..06e0fc804226 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -12,6 +12,7 @@
#include <linux/extcon-provider.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
@@ -34,6 +35,7 @@
#define USB2_VBCTRL 0x60c
#define USB2_LINECTRL1 0x610
#define USB2_ADPCTRL 0x630
+#define USB2_PHYCLK_CTRL 0x644
/* INT_ENABLE */
#define USB2_INT_ENABLE_UCOM_INTEN BIT(3)
@@ -75,6 +77,9 @@
#define USB2_ADPCTRL_IDPULLUP BIT(5) /* 1 = ID sampling is enabled */
#define USB2_ADPCTRL_DRVVBUS BIT(4)
+/* PHYCLK_CTRL */
+#define PHYCLK_CTRL_UCLKSEL BIT(0)
+
#define NUM_OF_PHYS 4
enum rcar_gen3_phy_index {
PHY_INDEX_BOTH_HC,
@@ -110,6 +115,7 @@ struct rcar_gen3_chan {
bool extcon_host;
bool is_otg_channel;
bool uses_otg_pins;
+ bool uses_usb_x1;
};
/*
@@ -391,6 +397,9 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)
void __iomem *usb2_base = channel->base;
u32 val;
+ if (channel->uses_usb_x1)
+ writel(PHYCLK_CTRL_UCLKSEL, usb2_base + USB2_PHYCLK_CTRL);
+
/* Initialize USB2 part */
val = readl(usb2_base + USB2_INT_ENABLE);
val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
@@ -583,6 +592,7 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct rcar_gen3_chan *channel;
struct phy_provider *provider;
+ struct clk *usb_x1_clk;
struct resource *res;
const struct phy_ops *phy_usb2_ops;
int irq, ret = 0, i;
@@ -630,6 +640,10 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
}
}
+ usb_x1_clk = devm_clk_get(dev, "usb_x1");
+ if (!IS_ERR(usb_x1_clk) && clk_get_rate(usb_x1_clk))
+ channel->uses_usb_x1 = true;
+
/*
* devm_phy_create() will call pm_runtime_enable(&phy->dev);
* And then, phy-core will manage runtime pm for this device.
--
2.16.1
