From 5af9405397bfb90d6adab61d58f4d94c78166698 Mon Sep 17 00:00:00 2001 From: Luca Ceresoli Date: Mon, 31 May 2021 10:59:34 +0200 Subject: [PATCH] PCI: dra7xx: Get an optional clock If the clock is provided externally we need to make sure it is enabled before starting PCI scan. Link: https://lore.kernel.org/r/20210531085934.2662457-5-luca@lucaceresoli.net Signed-off-by: Luca Ceresoli Signed-off-by: Lorenzo Pieralisi Acked-by: Kishon Vijay Abraham I --- drivers/pci/controller/dwc/pci-dra7xx.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c index f8b1221..a4221f6 100644 --- a/drivers/pci/controller/dwc/pci-dra7xx.c +++ b/drivers/pci/controller/dwc/pci-dra7xx.c @@ -7,6 +7,7 @@ * Authors: Kishon Vijay Abraham I */ +#include #include #include #include @@ -90,6 +91,7 @@ struct dra7xx_pcie { int phy_count; /* DT phy-names count */ struct phy **phy; struct irq_domain *irq_domain; + struct clk *clk; enum dw_pcie_device_mode mode; }; @@ -741,6 +743,15 @@ static int dra7xx_pcie_probe(struct platform_device *pdev) if (!link) return -ENOMEM; + dra7xx->clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(dra7xx->clk)) + return dev_err_probe(dev, PTR_ERR(dra7xx->clk), + "clock request failed"); + + ret = clk_prepare_enable(dra7xx->clk); + if (ret) + return ret; + for (i = 0; i < phy_count; i++) { snprintf(name, sizeof(name), "pcie-phy%d", i); phy[i] = devm_phy_get(dev, name); @@ -926,6 +937,8 @@ static void dra7xx_pcie_shutdown(struct platform_device *pdev) pm_runtime_disable(dev); dra7xx_pcie_disable_phy(dra7xx); + + clk_disable_unprepare(dra7xx->clk); } static const struct dev_pm_ops dra7xx_pcie_pm_ops = { -- 2.7.4