From 7bc057dd65ab02995f21fa3b0f9d97261cd5aa2a Mon Sep 17 00:00:00 2001 From: Amelie Delaunay Date: Mon, 8 Feb 2021 12:46:59 +0100 Subject: phy: stm32: register usbphyc as 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: Amelie Delaunay Link: https://lore.kernel.org/r/20210208114659.15269-3-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul --- drivers/phy/st/Kconfig | 1 + drivers/phy/st/phy-stm32-usbphyc.c | 65 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/drivers/phy/st/Kconfig b/drivers/phy/st/Kconfig index b32f44ff9033..3fc3d0781fb8 100644 --- a/drivers/phy/st/Kconfig +++ b/drivers/phy/st/Kconfig @@ -36,6 +36,7 @@ config PHY_STIH407_USB config PHY_STM32_USBPHYC tristate "STMicroelectronics STM32 USB HS PHY Controller driver" depends on ARCH_STM32 || COMPILE_TEST + depends on COMMON_CLK select GENERIC_PHY help Enable this to support the High-Speed USB transceivers that are part diff --git a/drivers/phy/st/phy-stm32-usbphyc.c b/drivers/phy/st/phy-stm32-usbphyc.c index d08fbb180e43..c184f4e34584 100644 --- a/drivers/phy/st/phy-stm32-usbphyc.c +++ b/drivers/phy/st/phy-stm32-usbphyc.c @@ -7,6 +7,7 @@ */ #include #include +#include #include #include #include @@ -70,6 +71,7 @@ struct stm32_usbphyc { struct regulator *vdda1v1; struct regulator *vdda1v8; atomic_t n_pll_cons; + struct clk_hw clk48_hw; int switch_setup; }; @@ -295,6 +297,61 @@ static const struct phy_ops stm32_usbphyc_phy_ops = { .owner = THIS_MODULE, }; +static int stm32_usbphyc_clk48_prepare(struct clk_hw *hw) +{ + struct stm32_usbphyc *usbphyc = container_of(hw, struct stm32_usbphyc, clk48_hw); + + return stm32_usbphyc_pll_enable(usbphyc); +} + +static void stm32_usbphyc_clk48_unprepare(struct clk_hw *hw) +{ + struct stm32_usbphyc *usbphyc = container_of(hw, struct stm32_usbphyc, clk48_hw); + + stm32_usbphyc_pll_disable(usbphyc); +} + +static unsigned long stm32_usbphyc_clk48_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + return 48000000; +} + +static const struct clk_ops usbphyc_clk48_ops = { + .prepare = stm32_usbphyc_clk48_prepare, + .unprepare = stm32_usbphyc_clk48_unprepare, + .recalc_rate = stm32_usbphyc_clk48_recalc_rate, +}; + +static void stm32_usbphyc_clk48_unregister(void *data) +{ + struct stm32_usbphyc *usbphyc = data; + + of_clk_del_provider(usbphyc->dev->of_node); + clk_hw_unregister(&usbphyc->clk48_hw); +} + +static int stm32_usbphyc_clk48_register(struct stm32_usbphyc *usbphyc) +{ + struct device_node *node = usbphyc->dev->of_node; + struct clk_init_data init = { }; + int ret = 0; + + init.name = "ck_usbo_48m"; + init.ops = &usbphyc_clk48_ops; + + usbphyc->clk48_hw.init = &init; + + ret = clk_hw_register(usbphyc->dev, &usbphyc->clk48_hw); + if (ret) + return ret; + + ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &usbphyc->clk48_hw); + if (ret) + clk_hw_unregister(&usbphyc->clk48_hw); + + return ret; +} + static void stm32_usbphyc_switch_setup(struct stm32_usbphyc *usbphyc, u32 utmi_switch) { @@ -473,6 +530,12 @@ static int stm32_usbphyc_probe(struct platform_device *pdev) goto clk_disable; } + ret = stm32_usbphyc_clk48_register(usbphyc); + if (ret) { + dev_err(dev, "failed to register ck_usbo_48m clock: %d\n", ret); + goto clk_disable; + } + version = readl_relaxed(usbphyc->base + STM32_USBPHYC_VERSION); dev_info(dev, "registered rev:%lu.%lu\n", FIELD_GET(MAJREV, version), FIELD_GET(MINREV, version)); @@ -497,6 +560,8 @@ static int stm32_usbphyc_remove(struct platform_device *pdev) if (usbphyc->phys[port]->active) stm32_usbphyc_phy_exit(usbphyc->phys[port]->phy); + stm32_usbphyc_clk48_unregister(usbphyc); + clk_disable_unprepare(usbphyc->clk); return 0; -- cgit