linux-kernel - [PATCH v6 2/2] PCI: exynos: Adapt to clk_bulk

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Message-Id: <20240220084046.23786-3-shradha.t@samsung.com>
Date: Tue, 20 Feb 2024 14:10:46 +0530
From: Shradha Todi <shradha.t@...sung.com>
To: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Cc: mturquette@...libre.com, sboyd@...nel.org, jingoohan1@...il.com,
	lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	krzysztof.kozlowski@...aro.org, alim.akhtar@...sung.com,
	linux@...linux.org.uk, m.szyprowski@...sung.com,
	manivannan.sadhasivam@...aro.org, pankaj.dubey@...sung.com,
	gost.dev@...sung.com, Shradha Todi <shradha.t@...sung.com>
Subject: [PATCH v6 2/2] PCI: exynos: Adapt to clk_bulk_* APIs

There is no need to hardcode the clock info in the driver as driver can
rely on the devicetree to supply the clocks required for the functioning
of the peripheral. Get rid of the static clock info and obtain the
platform supplied clocks. All the clocks supplied is obtained and enabled
using the devm_clk_bulk_get_all_enable() API.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Shradha Todi <shradha.t@...sung.com>
---
 drivers/pci/controller/dwc/pci-exynos.c | 54 ++-----------------------
 1 file changed, 4 insertions(+), 50 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index ec5611005566..3234eb5be1fb 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -54,43 +54,11 @@
 struct exynos_pcie {
 	struct dw_pcie			pci;
 	void __iomem			*elbi_base;
-	struct clk			*clk;
-	struct clk			*bus_clk;
+	struct clk_bulk_data		*clks;
 	struct phy			*phy;
 	struct regulator_bulk_data	supplies[2];
 };
 
-static int exynos_pcie_init_clk_resources(struct exynos_pcie *ep)
-{
-	struct device *dev = ep->pci.dev;
-	int ret;
-
-	ret = clk_prepare_enable(ep->clk);
-	if (ret) {
-		dev_err(dev, "cannot enable pcie rc clock");
-		return ret;
-	}
-
-	ret = clk_prepare_enable(ep->bus_clk);
-	if (ret) {
-		dev_err(dev, "cannot enable pcie bus clock");
-		goto err_bus_clk;
-	}
-
-	return 0;
-
-err_bus_clk:
-	clk_disable_unprepare(ep->clk);
-
-	return ret;
-}
-
-static void exynos_pcie_deinit_clk_resources(struct exynos_pcie *ep)
-{
-	clk_disable_unprepare(ep->bus_clk);
-	clk_disable_unprepare(ep->clk);
-}
-
 static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
 {
 	writel(val, base + reg);
@@ -332,17 +300,9 @@ static int exynos_pcie_probe(struct platform_device *pdev)
 	if (IS_ERR(ep->elbi_base))
 		return PTR_ERR(ep->elbi_base);
 
-	ep->clk = devm_clk_get(dev, "pcie");
-	if (IS_ERR(ep->clk)) {
-		dev_err(dev, "Failed to get pcie rc clock\n");
-		return PTR_ERR(ep->clk);
-	}
-
-	ep->bus_clk = devm_clk_get(dev, "pcie_bus");
-	if (IS_ERR(ep->bus_clk)) {
-		dev_err(dev, "Failed to get pcie bus clock\n");
-		return PTR_ERR(ep->bus_clk);
-	}
+	ret = devm_clk_bulk_get_all_enable(dev, &ep->clks);
+	if (ret < 0)
+		return ret;
 
 	ep->supplies[0].supply = "vdd18";
 	ep->supplies[1].supply = "vdd10";
@@ -351,10 +311,6 @@ static int exynos_pcie_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = exynos_pcie_init_clk_resources(ep);
-	if (ret)
-		return ret;
-
 	ret = regulator_bulk_enable(ARRAY_SIZE(ep->supplies), ep->supplies);
 	if (ret)
 		return ret;
@@ -369,7 +325,6 @@ static int exynos_pcie_probe(struct platform_device *pdev)
 
 fail_probe:
 	phy_exit(ep->phy);
-	exynos_pcie_deinit_clk_resources(ep);
 	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
 
 	return ret;
@@ -383,7 +338,6 @@ static int __exit exynos_pcie_remove(struct platform_device *pdev)
 	exynos_pcie_assert_core_reset(ep);
 	phy_power_off(ep->phy);
 	phy_exit(ep->phy);
-	exynos_pcie_deinit_clk_resources(ep);
 	regulator_bulk_disable(ARRAY_SIZE(ep->supplies), ep->supplies);
 
 	return 0;
-- 
2.17.1