[PATCH v2 2/2] PCI: qcom: add support for ddrss_sf_tbu clock

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

On SM8250 additional clock is required for PCIe devices to access NOC.
Update PCIe controller driver to control this clock.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Fixes: e1dd639e374a ("PCI: qcom: Add SM8250 SoC support")
---
 drivers/pci/controller/dwc/pcie-qcom.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index affa2713bf80..658d007a764c 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -159,8 +159,9 @@ struct qcom_pcie_resources_2_3_3 {
 	struct reset_control *rst[7];
 };
 
+#define QCOM_PCIE_2_7_0_MAX_CLOCKS	6
 struct qcom_pcie_resources_2_7_0 {
-	struct clk_bulk_data clks[6];
+	struct clk_bulk_data clks[QCOM_PCIE_2_7_0_MAX_CLOCKS + 1]; /* + 1 for sf_tbu */
 	struct regulator_bulk_data supplies[2];
 	struct reset_control *pci_reset;
 	struct clk *pipe_clk;
@@ -1153,10 +1154,15 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
 	res->clks[4].id = "slave_q2a";
 	res->clks[5].id = "tbu";
 
-	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
+	ret = devm_clk_bulk_get(dev, QCOM_PCIE_2_7_0_MAX_CLOCKS, res->clks);
 	if (ret < 0)
 		return ret;
 
+	/* Optional clock for SM8250 */
+	res->clks[6].clk = devm_clk_get_optional(dev, "ddrss_sf_tbu");
+	if (IS_ERR(res->clks[6].clk))
+		return PTR_ERR(res->clks[6].clk);
+
 	res->pipe_clk = devm_clk_get(dev, "pipe");
 	return PTR_ERR_OR_ZERO(res->pipe_clk);
 }
-- 
2.29.2