phy: stm32-usbphyc: usbphyc is a clock provider of ck_usbo_48m clock

ck_usbo_48m is generated by usbphyc PLL and used by OTG controller
for Full-Speed use cases with dedicated Full-Speed transceiver.

ck_usbo_48m is available as soon as the PLL is enabled.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
index bb743fe..9f0b7d7 100644 (file)
--- a/drivers/phy/phy-stm32-usbphyc.c
+++ b/drivers/phy/phy-stm32-usbphyc.c
@@ -7,6 +7,7 @@
 
 #include <common.h>
 #include <clk.h>
+#include <clk-uclass.h>
 #include <div64.h>
 #include <dm.h>
 #include <fdtdec.h>
@@ -17,6 +18,7 @@
 #include <usb.h>
 #include <asm/io.h>
 #include <dm/device_compat.h>
+#include <dm/lists.h>
 #include <dm/of_access.h>
 #include <linux/bitfield.h>
 #include <linux/bitops.h>
@@ -72,6 +74,9 @@
 #define PLL_INFF_MIN_RATE      19200000 /* in Hz */
 #define PLL_INFF_MAX_RATE      38400000 /* in Hz */
 
+/* USBPHYC_CLK48 */
+#define USBPHYC_CLK48_FREQ     48000000 /* in Hz */
+
 enum boosting_vals {
        BOOST_1000_UA = 1000,
        BOOST_2000_UA = 2000,
@@ -518,6 +523,16 @@ static const struct phy_ops stm32_usbphyc_phy_ops = {
        .of_xlate = stm32_usbphyc_of_xlate,
 };
 
+static int stm32_usbphyc_bind(struct udevice *dev)
+{
+       int ret;
+
+       ret = device_bind_driver_to_node(dev, "stm32-usbphyc-clk", "ck_usbo_48m",
+                                        dev_ofnode(dev), NULL);
+
+       return log_ret(ret);
+}
+
 static int stm32_usbphyc_probe(struct udevice *dev)
 {
        struct stm32_usbphyc *usbphyc = dev_get_priv(dev);
@@ -611,6 +626,70 @@ U_BOOT_DRIVER(stm32_usb_phyc) = {
        .id = UCLASS_PHY,
        .of_match = stm32_usbphyc_of_match,
        .ops = &stm32_usbphyc_phy_ops,
+       .bind = stm32_usbphyc_bind,
        .probe = stm32_usbphyc_probe,
        .priv_auto      = sizeof(struct stm32_usbphyc),
 };
+
+struct stm32_usbphyc_clk {
+       bool enable;
+};
+
+static ulong stm32_usbphyc_clk48_get_rate(struct clk *clk)
+{
+       return USBPHYC_CLK48_FREQ;
+}
+
+static int stm32_usbphyc_clk48_enable(struct clk *clk)
+{
+       struct stm32_usbphyc_clk *usbphyc_clk = dev_get_priv(clk->dev);
+       struct stm32_usbphyc *usbphyc;
+       int ret;
+
+       if (usbphyc_clk->enable)
+               return 0;
+
+       usbphyc = dev_get_priv(clk->dev->parent);
+
+       /* ck_usbo_48m is generated by usbphyc PLL */
+       ret = stm32_usbphyc_pll_enable(usbphyc);
+       if (ret)
+               return ret;
+
+       usbphyc_clk->enable = true;
+
+       return 0;
+}
+
+static int stm32_usbphyc_clk48_disable(struct clk *clk)
+{
+       struct stm32_usbphyc_clk *usbphyc_clk = dev_get_priv(clk->dev);
+       struct stm32_usbphyc *usbphyc;
+       int ret;
+
+       if (!usbphyc_clk->enable)
+               return 0;
+
+       usbphyc = dev_get_priv(clk->dev->parent);
+
+       ret = stm32_usbphyc_pll_disable(usbphyc);
+       if (ret)
+               return ret;
+
+       usbphyc_clk->enable = false;
+
+       return 0;
+}
+
+const struct clk_ops usbphyc_clk48_ops = {
+       .get_rate = stm32_usbphyc_clk48_get_rate,
+       .enable = stm32_usbphyc_clk48_enable,
+       .disable = stm32_usbphyc_clk48_disable,
+};
+
+U_BOOT_DRIVER(stm32_usb_phyc_clk) = {
+       .name = "stm32-usbphyc-clk",
+       .id = UCLASS_CLK,
+       .ops = &usbphyc_clk48_ops,
+       .priv_auto = sizeof(struct stm32_usbphyc_clk),
+};