linux-kernel - [PATCH 3/8] drm: bridge: thc63lvd1024: Add support for LVDS mode map

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Message-Id: <1524130269-32688-4-git-send-email-jacopo+renesas@jmondi.org>
Date:   Thu, 19 Apr 2018 11:31:04 +0200
From:   Jacopo Mondi <jacopo+renesas@...ndi.org>
To:     architt@...eaurora.org, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, airlied@...ux.ie
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>, daniel@...ll.ch,
        peda@...ntia.se, linux-renesas-soc@...r.kernel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/8] drm: bridge: thc63lvd1024: Add support for LVDS mode map

The THC63LVD1024 LVDS to RGB bridge supports two different LVDS mapping
modes, selectable by means of an external pin.

Add support for configurable LVDS input mapping modes, using the newly
introduced support for bridge input image formats.

Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
---
 drivers/gpu/drm/bridge/thc63lvd1024.c | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c b/drivers/gpu/drm/bridge/thc63lvd1024.c
index 48527f8..a3071a1 100644
--- a/drivers/gpu/drm/bridge/thc63lvd1024.c
+++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
@@ -10,9 +10,15 @@
 #include <drm/drm_panel.h>
 
 #include <linux/gpio/consumer.h>
+#include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 
+enum thc63_lvds_mapping_mode {
+	THC63_LVDS_MAP_MODE2,
+	THC63_LVDS_MAP_MODE1,
+};
+
 enum thc63_ports {
 	THC63_LVDS_IN0,
 	THC63_LVDS_IN1,
@@ -116,6 +122,37 @@ static int thc63_parse_dt(struct thc63_dev *thc63)
 	return 0;
 }
 
+static int thc63_set_bus_fmt(struct thc63_dev *thc63)
+{
+	u32 bus_fmt;
+	u32 map;
+	int ret;
+
+	ret = of_property_read_u32(thc63->dev->of_node, "thine,map", &map);
+	if (ret) {
+		dev_err(thc63->dev,
+			"Unable to parse property \"thine,map\": %d\n", ret);
+		return ret;
+	}
+
+	switch (map) {
+	case THC63_LVDS_MAP_MODE1:
+		bus_fmt = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
+		break;
+	case THC63_LVDS_MAP_MODE2:
+		bus_fmt = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
+		break;
+	default:
+		dev_err(thc63->dev,
+			"Invalid value for property \"thine,map\": %u\n", map);
+		return -EINVAL;
+	}
+
+	drm_bridge_set_bus_formats(&thc63->bridge, &bus_fmt, 1);
+
+	return 0;
+}
+
 static int thc63_gpio_init(struct thc63_dev *thc63)
 {
 	thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
@@ -166,6 +203,10 @@ static int thc63_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = thc63_set_bus_fmt(thc63);
+	if (ret)
+		return ret;
+
 	thc63->bridge.driver_private = thc63;
 	thc63->bridge.of_node = pdev->dev.of_node;
 	thc63->bridge.funcs = &thc63_bridge_func;
-- 
2.7.4