rockchip: video: split RK3288-specific part off from rk_hdmi

To prepare for the addition of RK3399 HDMI support, the HDMI driver is
refactored and broken into a chip-specific and a generic part.  This
change adds the internal interfaces, makes common/reusable functions
externally visible and splits the RK3288 driver into a separate file.

For the probing of regulators, we reuse the infrastructure created
during the VOP refactoring... i.e. we simply call into the helper
function defined for the VOP.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

4 files changed, 166 insertions, 90 deletions

diff --git a/drivers/video/rockchip/Makefile b/drivers/video/rockchip/Makefile
index 495d5f7..65d0ed6 100644
--- a/drivers/video/rockchip/Makefile
+++ b/drivers/video/rockchip/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_ROCKCHIP_RK3288) += rk3288_vop.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += rk3399_vop.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_EDP) += rk_edp.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_LVDS) += rk_lvds.o
-obj-$(CONFIG_DISPLAY_ROCKCHIP_HDMI) += rk_hdmi.o
+obj-hdmi-$(CONFIG_ROCKCHIP_RK3288) += rk3288_hdmi.o
+obj-$(CONFIG_DISPLAY_ROCKCHIP_HDMI) += rk_hdmi.o $(obj-hdmi-y)
 obj-$(CONFIG_DISPLAY_ROCKCHIP_MIPI) += rk_mipi.o
 endif
diff --git a/drivers/video/rockchip/rk3288_hdmi.c b/drivers/video/rockchip/rk3288_hdmi.c
new file mode 100644
index 0000000..eae0dd2
--- /dev/null
+++ b/drivers/video/rockchip/rk3288_hdmi.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <dw_hdmi.h>
+#include <edid.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/grf_rk3288.h>
+#include <power/regulator.h>
+#include "rk_hdmi.h"
+
+static int rk3288_hdmi_enable(struct udevice *dev, int panel_bpp,
+			      const struct display_timing *edid)
+{
+	struct rk_hdmi_priv *priv = dev_get_priv(dev);
+	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
+	int vop_id = uc_plat->source_id;
+	struct rk3288_grf *grf = priv->grf;
+
+	/* hdmi source select hdmi controller */
+	rk_setreg(&grf->soc_con6, 1 << 15);
+
+	/* hdmi data from vop id */
+	rk_clrsetreg(&grf->soc_con6, 1 << 4, (vop_id == 1) ? (1 << 4) : 0);
+
+	return 0;
+}
+
+static int rk3288_hdmi_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk_hdmi_priv *priv = dev_get_priv(dev);
+	struct dw_hdmi *hdmi = &priv->hdmi;
+
+	hdmi->i2c_clk_high = 0x7a;
+	hdmi->i2c_clk_low = 0x8d;
+
+	/*
+	 * TODO(sjg@chromium.org): The above values don't work - these
+	 * ones work better, but generate lots of errors in the data.
+	 */
+	hdmi->i2c_clk_high = 0x0d;
+	hdmi->i2c_clk_low = 0x0d;
+
+	return rk_hdmi_ofdata_to_platdata(dev);
+}
+
+static int rk3288_clk_config(struct udevice *dev)
+{
+	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
+	struct clk clk;
+	int ret;
+
+	/*
+	 * Configure the maximum clock to permit whatever resolution the
+	 * monitor wants
+	 */
+	ret = clk_get_by_index(uc_plat->src_dev, 0, &clk);
+	if (ret >= 0) {
+		ret = clk_set_rate(&clk, 384000000);
+		clk_free(&clk);
+	}
+	if (ret < 0) {
+		debug("%s: Failed to set clock in source device '%s': ret=%d\n",
+		      __func__, uc_plat->src_dev->name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const char * const rk3288_regulator_names[] = {
+	"vcc50_hdmi"
+};
+
+static int rk3288_hdmi_probe(struct udevice *dev)
+{
+	/* Enable VOP clock for RK3288 */
+	rk3288_clk_config(dev);
+
+	/* Enable regulators required for HDMI */
+	rk_hdmi_probe_regulators(dev, rk3288_regulator_names,
+				 ARRAY_SIZE(rk3288_regulator_names));
+
+	return rk_hdmi_probe(dev);
+}
+
+static const struct dm_display_ops rk3288_hdmi_ops = {
+	.read_edid = rk_hdmi_read_edid,
+	.enable = rk3288_hdmi_enable,
+};
+
+static const struct udevice_id rk3288_hdmi_ids[] = {
+	{ .compatible = "rockchip,rk3288-dw-hdmi" },
+	{ }
+};
+
+U_BOOT_DRIVER(rk3288_hdmi_rockchip) = {
+	.name = "rk3288_hdmi_rockchip",
+	.id = UCLASS_DISPLAY,
+	.of_match = rk3288_hdmi_ids,
+	.ops = &rk3288_hdmi_ops,
+	.ofdata_to_platdata = rk3288_hdmi_ofdata_to_platdata,
+	.probe = rk3288_hdmi_probe,
+	.priv_auto_alloc_size = sizeof(struct rk_hdmi_priv),
+};
diff --git a/drivers/video/rockchip/rk_hdmi.c b/drivers/video/rockchip/rk_hdmi.c
index 2d1b5e7..a9c8fba 100644
--- a/drivers/video/rockchip/rk_hdmi.c
+++ b/drivers/video/rockchip/rk_hdmi.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
  * Copyright (c) 2015 Google, Inc
  * Copyright 2014 Rockchip Inc.
  *
@@ -17,13 +18,9 @@
 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
-#include <asm/arch/grf_rk3288.h>
-#include <power/regulator.h>
-
-struct rk_hdmi_priv {
-	struct dw_hdmi hdmi;
-	struct rk3288_grf *grf;
-};
+#include <asm/arch/hardware.h>
+#include "rk_hdmi.h"
+#include "rk_vop.h" /* for rk_vop_probe_regulators */
 
 static const struct hdmi_phy_config rockchip_phy_config[] = {
 	{
@@ -75,22 +72,14 @@ static const struct hdmi_mpll_config rockchip_mpll_cfg[] = {
 	}
 };
 
-static int rk_hdmi_read_edid(struct udevice *dev, u8 *buf, int buf_size)
+int rk_hdmi_read_edid(struct udevice *dev, u8 *buf, int buf_size)
 {
 	struct rk_hdmi_priv *priv = dev_get_priv(dev);
 
 	return dw_hdmi_read_edid(&priv->hdmi, buf, buf_size);
 }
 
-static int rk_hdmi_enable(struct udevice *dev, int panel_bpp,
-			  const struct display_timing *edid)
-{
-	struct rk_hdmi_priv *priv = dev_get_priv(dev);
-
-	return dw_hdmi_enable(&priv->hdmi, edid);
-}
-
-static int rk_hdmi_ofdata_to_platdata(struct udevice *dev)
+int rk_hdmi_ofdata_to_platdata(struct udevice *dev)
 {
 	struct rk_hdmi_priv *priv = dev_get_priv(dev);
 	struct dw_hdmi *hdmi = &priv->hdmi;
@@ -98,15 +87,9 @@ static int rk_hdmi_ofdata_to_platdata(struct udevice *dev)
 	hdmi->ioaddr = (ulong)devfdt_get_addr(dev);
 	hdmi->mpll_cfg = rockchip_mpll_cfg;
 	hdmi->phy_cfg = rockchip_phy_config;
-	hdmi->i2c_clk_high = 0x7a;
-	hdmi->i2c_clk_low = 0x8d;
-
-	/*
-	 * TODO(sjg@chromium.org): The above values don't work - these ones
-	 * work better, but generate lots of errors in the data.
-	 */
-	hdmi->i2c_clk_high = 0x0d;
-	hdmi->i2c_clk_low = 0x0d;
+
+	/* hdmi->i2c_clk_{high,low} are set up by the SoC driver */
+
 	hdmi->reg_io_width = 4;
 	hdmi->phy_set = dw_hdmi_phy_cfg;
 
@@ -115,53 +98,17 @@ static int rk_hdmi_ofdata_to_platdata(struct udevice *dev)
 	return 0;
 }
 
-static int rk_hdmi_probe(struct udevice *dev)
+void rk_hdmi_probe_regulators(struct udevice *dev,
+			      const char * const *names, int cnt)
+{
+	rk_vop_probe_regulators(dev, names, cnt);
+}
+
+int rk_hdmi_probe(struct udevice *dev)
 {
-	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
 	struct rk_hdmi_priv *priv = dev_get_priv(dev);
 	struct dw_hdmi *hdmi = &priv->hdmi;
-	struct udevice *reg;
-	struct clk clk;
 	int ret;
-	int vop_id = uc_plat->source_id;
-
-	ret = clk_get_by_index(dev, 0, &clk);
-	if (ret >= 0) {
-		ret = clk_set_rate(&clk, 0);
-		clk_free(&clk);
-	}
-	if (ret) {
-		debug("%s: Failed to set hdmi clock: ret=%d\n", __func__, ret);
-		return ret;
-	}
-
-	/*
-	 * Configure the maximum clock to permit whatever resolution the
-	 * monitor wants
-	 */
-	ret = clk_get_by_index(uc_plat->src_dev, 0, &clk);
-	if (ret >= 0) {
-		ret = clk_set_rate(&clk, 384000000);
-		clk_free(&clk);
-	}
-	if (ret < 0) {
-		debug("%s: Failed to set clock in source device '%s': ret=%d\n",
-		      __func__, uc_plat->src_dev->name, ret);
-		return ret;
-	}
-
-	ret = regulator_get_by_platname("vcc50_hdmi", &reg);
-	if (!ret)
-		ret = regulator_set_enable(reg, true);
-	if (ret)
-		debug("%s: Cannot set regulator vcc50_hdmi\n", __func__);
-
-	/* hdmi source select hdmi controller */
-	rk_setreg(&priv->grf->soc_con6, 1 << 15);
-
-	/* hdmi data from vop id */
-	rk_clrsetreg(&priv->grf->soc_con6, 1 << 4,
-		     (vop_id == 1) ? (1 << 4) : 0);
 
 	ret = dw_hdmi_phy_wait_for_hpd(hdmi);
 	if (ret < 0) {
@@ -174,23 +121,3 @@ static int rk_hdmi_probe(struct udevice *dev)
 
 	return 0;
 }
-
-static const struct dm_display_ops rk_hdmi_ops = {
-	.read_edid = rk_hdmi_read_edid,
-	.enable = rk_hdmi_enable,
-};
-
-static const struct udevice_id rk_hdmi_ids[] = {
-	{ .compatible = "rockchip,rk3288-dw-hdmi" },
-	{ }
-};
-
-U_BOOT_DRIVER(hdmi_rockchip) = {
-	.name	= "hdmi_rockchip",
-	.id	= UCLASS_DISPLAY,
-	.of_match = rk_hdmi_ids,
-	.ops	= &rk_hdmi_ops,
-	.ofdata_to_platdata	= rk_hdmi_ofdata_to_platdata,
-	.probe	= rk_hdmi_probe,
-	.priv_auto_alloc_size	 = sizeof(struct rk_hdmi_priv),
-};
diff --git a/drivers/video/rockchip/rk_hdmi.h b/drivers/video/rockchip/rk_hdmi.h
new file mode 100644
index 0000000..501ed3a
--- /dev/null
+++ b/drivers/video/rockchip/rk_hdmi.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __RK_HDMI_H__
+#define __RK_HDMI_H__
+
+struct rkhdmi_driverdata {
+	/* configuration */
+	u8 i2c_clk_high;
+	u8 i2c_clk_low;
+	const char * const *regulator_names;
+	u32 regulator_names_cnt;
+	/* setters/getters */
+	int (*set_input_vop)(struct udevice *dev);
+	int (*clk_config)(struct udevice *dev);
+};
+
+struct rk_hdmi_priv {
+	struct dw_hdmi hdmi;
+	void *grf;
+};
+
+int rk_hdmi_read_edid(struct udevice *dev, u8 *buf, int buf_size);
+void rk_hdmi_probe_regulators(struct udevice *dev,
+			      const char * const *names, int cnt);
+int rk_hdmi_ofdata_to_platdata(struct udevice *dev);
+int rk_hdmi_probe(struct udevice *dev);
+
+#endif