From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
This patch adds support to enable 100MHz pcie refclk,
On some boards like DB600c this clock is not enabled by default.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
Documentation/devicetree/bindings/pci/qcom,pcie.txt | 1 +
drivers/pci/dwc/pcie-qcom.c | 21 ++++++++++++++++++++-
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
index 3c9d321b3d3b..7f001f5913cf 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
@@ -88,6 +88,7 @@
Definition: Should contain the following entries
- "core" Clocks the pcie hw block
- "phy" Clocks the pcie PHY block
+ - "ref" Clocks the pcie refclk
- clock-names:
Usage: required for apq8084/ipq4019
Value type: <stringlist>
diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
index 6310c66e265c..c316b0b7c614 100644
--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -82,6 +82,7 @@
struct qcom_pcie_resources_2_1_0 {
struct clk *iface_clk;
struct clk *core_clk;
+ struct clk *ref_clk;
struct clk *phy_clk;
struct reset_control *pci_reset;
struct reset_control *axi_reset;
@@ -233,6 +234,15 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
if (IS_ERR(res->iface_clk))
return PTR_ERR(res->iface_clk);
+ res->ref_clk = devm_clk_get(dev, "ref");
+
+ if (IS_ERR(res->ref_clk)) {
+ if (PTR_ERR(res->ref_clk) == -EPROBE_DEFER)
+ return PTR_ERR(res->ref_clk);
+
+ res->ref_clk = NULL;
+ }
+
res->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(res->core_clk))
return PTR_ERR(res->core_clk);
@@ -271,6 +281,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
reset_control_assert(res->por_reset);
reset_control_assert(res->pci_reset);
clk_disable_unprepare(res->iface_clk);
+ clk_disable_unprepare(res->ref_clk);
clk_disable_unprepare(res->core_clk);
clk_disable_unprepare(res->phy_clk);
regulator_disable(res->vdda);
@@ -310,10 +321,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
goto err_assert_ahb;
}
+ ret = clk_prepare_enable(res->ref_clk);
+ if (ret) {
+ dev_err(dev, "cannot prepare/enable ref clock\n");
+ goto err_assert_ahb;
+ }
+
ret = clk_prepare_enable(res->iface_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable iface clock\n");
- goto err_assert_ahb;
+ goto err_clk_iface;
}
ret = clk_prepare_enable(res->phy_clk);
@@ -386,6 +403,8 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
clk_disable_unprepare(res->phy_clk);
err_clk_phy:
clk_disable_unprepare(res->iface_clk);
+err_clk_iface:
+ clk_disable_unprepare(res->ref_clk);
err_assert_ahb:
regulator_disable(res->vdda_phy);
err_vdda_phy:
--
2.16.2
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
