linux-kernel - [PATCH v2 4/4] PCI: dra7xx: Get an optional clock

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Date:   Mon, 31 May 2021 10:59:34 +0200
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     linux-pci@...r.kernel.org
Cc:     Luca Ceresoli <luca@...aceresoli.net>, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
Subject: [PATCH v2 4/4] PCI: dra7xx: Get an optional clock

If the clock is provided externally we need to make sure it is enabled
before starting PCI scan.

Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>

---

Changes v1 -> v2:
 - Update commit subject as suggested by Bjorn
---
 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 a8daa356f7e6..11f392b7a9a2 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 <kishon@...com>
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -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;
 };
 
@@ -745,6 +747,15 @@ 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);
@@ -932,6 +943,8 @@ 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 = {
-- 
2.25.1