[PATCH 1/4] drm/exynos: dsim: fix to control mipi phy register

[Inki Dae <inki.dae@samsung.com>]

This patch fixes the issue that the try to get a phy object is failed
to enable mipi phy.

System and power management unit registers should be controlled by
syscon framework. So this patch removes existing phy framework based
codes and adds syscon support instead. However, we should support
legacy device tree binding so consider the legacy binding for compatibility.

In addition, we need to remove below device node and relevant properties,
	mipi_phy: video-phy@10020710 {
		compatible = "samsung,s5pv210-mipi-video-phy";
		reg = <0x10020710 8>;
		#phy-cells = <1>;
	};

Now camera device node uses mipi_phy node relevant properties like below,
	camera {
		...
		csis_0: csis@11880000 {
			...
			phys = <&mipi_phy 0>;
			phy-names = "csis";
			...
		};
		csis_1: csis@11890000 {
			...
			phys = <&mipi_phy 2>;
			phy-names = "csis";
			...
		};
		...
	};

With above, we will find below message while booting,
     can't request region for resource [mem 0x10020710-0x10020717]

Signed-off-by: Inki Dae <inki.dae@samsung.com>
---
 .../devicetree/bindings/video/exynos_dsim.txt      |    9 ++--
 drivers/gpu/drm/exynos/exynos_drm_dsi.c            |   54 ++++++++++++++++++--
 2 files changed, 56 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/video/exynos_dsim.txt b/Documentation/devicetree/bindings/video/exynos_dsim.txt
index ca2b4aa..dec3b55 100644
--- a/Documentation/devicetree/bindings/video/exynos_dsim.txt
+++ b/Documentation/devicetree/bindings/video/exynos_dsim.txt
@@ -11,15 +11,18 @@ Required properties:
   - clocks: list of clock specifiers, must contain an entry for each required
     entry in clock-names
   - clock-names: should include "bus_clk"and "pll_clk" entries
-  - phys: list of phy specifiers, must contain an entry for each required
-    entry in phy-names
-  - phy-names: should include "dsim" entry
+  - samsung,pmureg: handle to syscon used to control the PMU registers
   - vddcore-supply: MIPI DSIM Core voltage supply (e.g. 1.1V)
   - vddio-supply: MIPI DSIM I/O and PLL voltage supply (e.g. 1.8V)
   - samsung,pll-clock-frequency: specifies frequency of the "pll_clk" clock
   - #address-cells, #size-cells: should be set respectively to <1> and <0>
     according to DSI host bindings (see MIPI DSI bindings [1])
 
+Deprecated properties for MIPI DSI Master:
+  - phys: list of phy specifiers, must contain an entry for each required
+    entry in phy-names (Deprecated)
+  - phy-names: should include "dsim" entry (Deprecated)
+
 Optional properties:
   - samsung,power-domain: a phandle to DSIM power domain node
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 05fe93d..38b025e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -23,6 +23,8 @@
 #include <linux/phy/phy.h>
 #include <linux/regulator/consumer.h>
 #include <linux/component.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include <video/mipi_display.h>
 #include <video/videomode.h>
@@ -263,6 +265,8 @@ struct exynos_dsi_transfer {
 struct exynos_dsi_driver_data {
 	unsigned int plltmr_reg;
 
+	unsigned int mipi_phy_offset;
+	unsigned int mipi_phy_en_shift;
 	unsigned int has_freqband:1;
 	unsigned int has_clklane_stop:1;
 };
@@ -277,6 +281,7 @@ struct exynos_dsi {
 
 	void __iomem *reg_base;
 	struct phy *phy;
+	struct regmap *pmureg;
 	struct clk *pll_clk;
 	struct clk *bus_clk;
 	struct regulator_bulk_data supplies[2];
@@ -313,21 +318,29 @@ static struct exynos_dsi_driver_data exynos3_dsi_driver_data = {
 	.plltmr_reg = 0x50,
 	.has_freqband = 1,
 	.has_clklane_stop = 1,
+	.mipi_phy_offset = 0x710,
+	.mipi_phy_en_shift = 0,
 };
 
 static struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
 	.plltmr_reg = 0x50,
 	.has_freqband = 1,
 	.has_clklane_stop = 1,
+	.mipi_phy_offset = 0x710,
+	.mipi_phy_en_shift = 0,
 };
 
 static struct exynos_dsi_driver_data exynos4415_dsi_driver_data = {
 	.plltmr_reg = 0x58,
 	.has_clklane_stop = 1,
+	.mipi_phy_offset = 0x710,
+	.mipi_phy_en_shift = 0,
 };
 
 static struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
 	.plltmr_reg = 0x58,
+	.mipi_phy_offset = 0x714,
+	.mipi_phy_en_shift = 0,
 };
 
 static struct of_device_id exynos_dsi_of_match[] = {
@@ -1294,6 +1307,7 @@ static const struct mipi_dsi_host_ops exynos_dsi_ops = {
 
 static int exynos_dsi_poweron(struct exynos_dsi *dsi)
 {
+	struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 	int ret;
 
 	ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
@@ -1314,7 +1328,14 @@ static int exynos_dsi_poweron(struct exynos_dsi *dsi)
 		goto err_pll_clk;
 	}
 
-	ret = phy_power_on(dsi->phy);
+	if (dsi->phy) {
+		ret = phy_power_on(dsi->phy);
+	} else {
+		ret = regmap_update_bits(dsi->pmureg,
+					 driver_data->mipi_phy_offset,
+					 0x1 << driver_data->mipi_phy_en_shift,
+					 0x1 << driver_data->mipi_phy_en_shift);
+	}
 	if (ret < 0) {
 		dev_err(dsi->dev, "cannot enable phy %d\n", ret);
 		goto err_phy;
@@ -1334,6 +1355,7 @@ err_bus_clk:
 
 static void exynos_dsi_poweroff(struct exynos_dsi *dsi)
 {
+	struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 	int ret;
 
 	usleep_range(10000, 20000);
@@ -1348,7 +1370,14 @@ static void exynos_dsi_poweroff(struct exynos_dsi *dsi)
 
 	dsi->state &= ~DSIM_STATE_CMD_LPM;
 
-	phy_power_off(dsi->phy);
+	if (dsi->phy) {
+		phy_power_off(dsi->phy);
+	} else {
+		regmap_update_bits(dsi->pmureg,
+				   driver_data->mipi_phy_offset,
+				   0x0 << driver_data->mipi_phy_en_shift,
+				   0x0 << driver_data->mipi_phy_en_shift);
+	}
 
 	clk_disable_unprepare(dsi->pll_clk);
 	clk_disable_unprepare(dsi->bus_clk);
@@ -1742,13 +1771,30 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 		goto err_del_component;
 	}
 
+	/*
+	 * Consider legacy device tree binding.
+	 * phy framework isn't used anymore. (Deprecated)
+	 */
 	dsi->phy = devm_phy_get(dev, "dsim");
-	if (IS_ERR(dsi->phy)) {
-		dev_info(dev, "failed to get dsim phy\n");
+	if (!IS_ERR(dsi->phy))
+		goto skip_syscon;
+
+	if (PTR_ERR(dsi->phy) == -EPROBE_DEFER) {
 		ret = PTR_ERR(dsi->phy);
 		goto err_del_component;
 	}
 
+	dsi->phy = NULL;
+
+	dsi->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
+							"samsung,pmureg");
+	if (IS_ERR(dsi->pmureg)) {
+		dev_warn(dev, "failed to get pmu register.\n");
+		ret = PTR_ERR(dsi->pmureg);
+		goto err_del_component;
+	}
+
+skip_syscon:
 	dsi->irq = platform_get_irq(pdev, 0);
 	if (dsi->irq < 0) {
 		dev_err(dev, "failed to request dsi irq resource\n");
-- 
1.7.9.5

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