linux-kernel - [PATCH v2 3/4] PCIe: qcom: Add support to control pipe clk mux

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Message-Id: <1622904059-21244-4-git-send-email-pmaliset@codeaurora.org>
Date:   Sat,  5 Jun 2021 20:10:58 +0530
From:   Prasad Malisetty <pmaliset@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, bhelgaas@...gle.com,
        robh+dt@...nel.org, swboyd@...omium.org, lorenzo.pieralisi@....com,
        svarbanov@...sol.com
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        mgautam@...eaurora.org, dianders@...omium.org, mka@...omium.org,
        sanm@...eaurora.org, Prasad Malisetty <pmaliset@...eaurora.org>
Subject: [PATCH v2 3/4] PCIe: qcom: Add support to control pipe clk mux

In PCIe driver pipe-clk mux needs to switch between pipe_clk
and XO for GDSC enable. This is done by setting pipe_clk mux
as parent of pipe_clk after phy init.

Signed-off-by: Prasad Malisetty <pmaliset@...eaurora.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8a7a300..5cbbea4 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -166,6 +166,9 @@ struct qcom_pcie_resources_2_7_0 {
 	struct regulator_bulk_data supplies[2];
 	struct reset_control *pci_reset;
 	struct clk *pipe_clk;
+	struct clk *pipe_clk_mux;
+	struct clk *pipe_ext_src;
+	struct clk *ref_clk_src;
 };
 
 union qcom_pcie_resources {
@@ -1167,6 +1170,20 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
 	if (ret < 0)
 		return ret;
 
+	if (of_device_is_compatible(dev->of_node, "qcom,pcie-sc7280")) {
+		res->pipe_clk_mux = devm_clk_get(dev, "pipe_src");
+		if (IS_ERR(res->pipe_clk_mux))
+			return PTR_ERR(res->pipe_clk_mux);
+
+		res->pipe_ext_src = devm_clk_get(dev, "pipe_ext");
+		if (IS_ERR(res->pipe_ext_src))
+			return PTR_ERR(res->pipe_ext_src);
+
+		res->ref_clk_src = devm_clk_get(dev, "ref");
+		if (IS_ERR(res->ref_clk_src))
+			return PTR_ERR(res->ref_clk_src);
+	}
+
 	res->pipe_clk = devm_clk_get(dev, "pipe");
 	return PTR_ERR_OR_ZERO(res->pipe_clk);
 }
@@ -1255,6 +1272,11 @@ static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
 static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie)
 {
 	struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
+	struct dw_pcie *pci = pcie->pci;
+	struct device *dev = pci->dev;
+
+	if (of_device_is_compatible(dev->of_node, "qcom,pcie-sc7280"))
+		clk_set_parent(res->pipe_clk_mux, res->pipe_ext_src);
 
 	return clk_prepare_enable(res->pipe_clk);
 }
-- 
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