[PATCH v5 4/5] PCI: qcom: Add interconnect support to 2.7.0/1.9.0 ops

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

Add optional interconnect support for the 2.7.0/1.9.0 hosts. Set the
bandwidth according to the values from the downstream driver.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index d8d400423a0a..55ac3caa6d7d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -12,6 +12,7 @@
 #include <linux/crc8.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
+#include <linux/interconnect.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -167,6 +168,7 @@ struct qcom_pcie_resources_2_7_0 {
 	struct clk *pipe_clk_src;
 	struct clk *phy_pipe_clk;
 	struct clk *ref_clk_src;
+	struct icc_path *path;
 };
 
 union qcom_pcie_resources {
@@ -1121,6 +1123,10 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
 	if (IS_ERR(res->pci_reset))
 		return PTR_ERR(res->pci_reset);
 
+	res->path = devm_of_icc_get(dev, "pci");
+	if (IS_ERR(res->path))
+		return PTR_ERR(res->path);
+
 	res->supplies[0].supply = "vdda";
 	res->supplies[1].supply = "vddpe-3v3";
 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(res->supplies),
@@ -1183,6 +1189,9 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
 	if (pcie->cfg->pipe_clk_need_muxing)
 		clk_set_parent(res->pipe_clk_src, res->phy_pipe_clk);
 
+	if (res->path)
+		icc_set_bw(res->path, 500, 800);
+
 	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
 	if (ret < 0)
 		goto err_disable_regulators;
@@ -1241,6 +1250,8 @@ static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
 	struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
 
 	clk_bulk_disable_unprepare(res->num_clks, res->clks);
+	if (res->path)
+		icc_set_bw(res->path, 0, 0);
 
 	/* Set TCXO as clock source for pcie_pipe_clk_src */
 	if (pcie->cfg->pipe_clk_need_muxing)
-- 
2.34.1