drm/msm/dsi: Use pinctrl in DSI driver

Some targets use pinctrl framework to configure some
pins. This change allows DSI driver to set default and
sleep pinctrl status.
Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

Documentation/devicetree/bindings/drm/msm/dsi.txt

@@ -38,6 +38,9 @@ Optional properties:
   driving a 2-DSI panel whose 2 links need receive command simultaneously.
 - interrupt-parent: phandle to the MDP block if the interrupt signal is routed
   through MDP block
+- pinctrl-names: the pin control state names; should contain "default"
+- pinctrl-0: the default pinctrl state (active)
+- pinctrl-n: the "sleep" pinctrl state
 
 DSI PHY:
 Required properties:
@@ -94,6 +97,10 @@ Example:
 		qcom,master-dsi;
 		qcom,sync-dual-dsi;
 
+		pinctrl-names = "default", "sleep";
+		pinctrl-0 = <&mdss_dsi_active>;
+		pinctrl-1 = <&mdss_dsi_suspend>;
+
 		panel: panel@0 {
 			compatible = "sharp,lq101r1sx01";
 			reg = <0>;

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -20,6 +20,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/regulator/consumer.h>
 #include <linux/spinlock.h>
 #include <video/mipi_display.h>
@@ -1919,6 +1920,13 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 		goto fail_disable_reg;
 	}
 
+	ret = pinctrl_pm_select_default_state(&msm_host->pdev->dev);
+	if (ret) {
+		pr_err("%s: failed to set pinctrl default state, %d\n",
+			__func__, ret);
+		goto fail_disable_clk;
+	}
+
 	dsi_timing_setup(msm_host);
 	dsi_sw_reset(msm_host);
 	dsi_ctrl_config(msm_host, true, clk_pre, clk_post);
@@ -1931,6 +1939,8 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 
 	return 0;
 
+fail_disable_clk:
+	dsi_clk_ctrl(msm_host, 0);
 fail_disable_reg:
 	dsi_host_regulator_disable(msm_host);
 unlock_ret:
@@ -1953,6 +1963,8 @@ int msm_dsi_host_power_off(struct mipi_dsi_host *host)
 	if (msm_host->disp_en_gpio)
 		gpiod_set_value(msm_host->disp_en_gpio, 0);
 
+	pinctrl_pm_select_sleep_state(&msm_host->pdev->dev);
+
 	msm_dsi_manager_phy_disable(msm_host->id);
 
 	dsi_clk_ctrl(msm_host, 0);