PCI: qcom: Add missing supplies required for msm8996

This patch adds supplies that are required for msm8996. vdda
is analog supply that go in to controller, and vddpe_3v3 is
supply to PCIe endpoint.

Without these supplies PCIe endpoints which require power supplies are
not enumerated at all, as there is no one to power it up.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Reviewed-by: Rob Herring <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
index 3c9d321b3d3b0d22e04d7ba8f022982ffc452cce..1fd703bd73e0f1f20fea286738f9f525d86b01eb 100644 (file)
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
@@ -189,6 +189,10 @@
        Value type: <phandle>
        Definition: A phandle to the analog power supply for IC which generates
                    reference clock
+- vddpe-3v3-supply:
+       Usage: optional
+       Value type: <phandle>
+       Definition: A phandle to the PCIe endpoint power supply
 
 - phys:
        Usage: required for apq8084

diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
index 6310c66e265c439319ac3234caf82e083d0aa819..a7c12f737690782cee20e635992a4e1a1957b3a4 100644 (file)
--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -102,12 +102,14 @@ struct qcom_pcie_resources_1_0_0 {
        struct regulator *vdda;
 };
 
+#define QCOM_PCIE_2_3_2_MAX_SUPPLY     2
 struct qcom_pcie_resources_2_3_2 {
        struct clk *aux_clk;
        struct clk *master_clk;
        struct clk *slave_clk;
        struct clk *cfg_clk;
        struct clk *pipe_clk;
+       struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
 };
 
 struct qcom_pcie_resources_2_4_0 {
@@ -521,6 +523,14 @@ static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)
        struct qcom_pcie_resources_2_3_2 *res = &pcie->res.v2_3_2;
        struct dw_pcie *pci = pcie->pci;
        struct device *dev = pci->dev;
+       int ret;
+
+       res->supplies[0].supply = "vdda";
+       res->supplies[1].supply = "vddpe-3v3";
+       ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
+                                     res->supplies);
+       if (ret)
+               return ret;
 
        res->aux_clk = devm_clk_get(dev, "aux");
        if (IS_ERR(res->aux_clk))
@@ -550,6 +560,8 @@ static void qcom_pcie_deinit_2_3_2(struct qcom_pcie *pcie)
        clk_disable_unprepare(res->master_clk);
        clk_disable_unprepare(res->cfg_clk);
        clk_disable_unprepare(res->aux_clk);
+
+       regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
 }
 
 static void qcom_pcie_post_deinit_2_3_2(struct qcom_pcie *pcie)
@@ -567,10 +579,16 @@ static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
        u32 val;
        int ret;
 
+       ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
+       if (ret < 0) {
+               dev_err(dev, "cannot enable regulators\n");
+               return ret;
+       }
+
        ret = clk_prepare_enable(res->aux_clk);
        if (ret) {
                dev_err(dev, "cannot prepare/enable aux clock\n");
-               return ret;
+               goto err_aux_clk;
        }
 
        ret = clk_prepare_enable(res->cfg_clk);
@@ -621,6 +639,9 @@ static int qcom_pcie_init_2_3_2(struct qcom_pcie *pcie)
 err_cfg_clk:
        clk_disable_unprepare(res->aux_clk);
 
+err_aux_clk:
+       regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
+
        return ret;
 }