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Thu, 04 Mar 2021 17:05:03 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id DDA3110002A; Thu, 4 Mar 2021 17:05:02 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CF8082073BB; Thu, 4 Mar 2021 17:05:02 +0100 (CET) Received: from localhost (10.75.127.49) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 4 Mar 2021 17:05:02 +0100 From: Amelie Delaunay To: Kishon Vijay Abraham I , Vinod Koul , Rob Herring , Alexandre Torgue , Maxime Coquelin CC: , , , , Amelie Delaunay Subject: [RESEND PATCH v3 2/2] phy: stm32: register usbphyc as clock provider of ck_usbo_48m clock Date: Thu, 4 Mar 2021 17:04:40 +0100 Message-ID: <20210304160440.27612-3-amelie.delaunay@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210304160440.27612-1-amelie.delaunay@foss.st.com> References: <20210304160440.27612-1-amelie.delaunay@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG3NODE2.st.com (10.75.127.8) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-03-04_05:2021-03-03, 2021-03-04 signatures=0 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- No changes in v3. Changes in v2: - fix COMMON_CLK dependency issue reported by kernel test robot --- 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; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel