linux-kernel - [RFC][PATCH 4/4] lcd: platform-lcd: Add device tree support

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Date:	Mon, 02 Jan 2012 11:24:35 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	rpurdie@...ys.net, linux-samsung-soc@...r.kernel.org,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	kgene.kim@...sung.com, jg1.han@...sung.com,
	broonie@...nsource.wolfsonmicro.com, kyungmin.park@...sung.com,
	cbou@...l.ru, kwangwoo.lee@...il.com, augulis.darius@...il.com,
	ben-linux@...ff.org, patches@...aro.org
Subject: [RFC][PATCH 4/4] lcd: platform-lcd: Add device tree support

Add device tree based initialization for Hydis hv070wsa lcd panel.

Cc: Ben Dooks <ben-linux@...ff.org>
Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
---
 drivers/video/backlight/platform_lcd.c |   33 ++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/drivers/video/backlight/platform_lcd.c b/drivers/video/backlight/platform_lcd.c
index feb4fd0..ebdddfd 100644
--- a/drivers/video/backlight/platform_lcd.c
+++ b/drivers/video/backlight/platform_lcd.c
@@ -18,6 +18,8 @@
 #include <linux/lcd.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #include <video/platform_lcd.h>
 
@@ -81,9 +83,18 @@ static struct lcd_ops platform_lcd_ops = {
 	.check_fb	= platform_lcd_match,
 };
 
+static const struct of_device_id platform_lcd_dt_match[];
+
 static inline struct plat_lcd_driver_data *platform_lcd_get_driver_data(
 			struct platform_device *pdev)
 {
+#ifdef CONFIG_OF
+	if (pdev->dev.of_node) {
+		const struct of_device_id *match;
+		match = of_match_node(platform_lcd_dt_match, pdev->dev.of_node);
+		return (struct plat_lcd_driver_data *)match->data;
+	}
+#endif
 	return (struct plat_lcd_driver_data *)
 			platform_get_device_id(pdev)->driver_data;
 }
@@ -167,6 +178,19 @@ static int lcd_hv070wsa_init(struct platform_lcd *plcd)
 	struct plat_lcd_hydis_hv070wsa_pdata *pdata = plcd->lcd_pdata;
 	int err;
 
+#ifdef CONFIG_OF
+	if (of_have_populated_dt()) {
+		plcd->lcd_pdata = devm_kzalloc(plcd->us,
+						sizeof(*pdata), GFP_KERNEL);
+		if (!plcd->lcd_pdata) {
+			dev_err(plcd->us, "mem alloc for pdata failed\n");
+			return -ENOMEM;
+		}
+		pdata = plcd->lcd_pdata;
+		pdata->gpio = of_get_gpio(plcd->us->of_node, 0);
+	}
+#endif
+
 	if (!pdata) {
 		dev_err(plcd->us, "no platform data\n");
 		return -EINVAL;
@@ -214,10 +238,19 @@ static struct platform_device_id platform_lcd_driver_ids[] = {
 };
 MODULE_DEVICE_TABLE(platform, platform_lcd_driver_ids);
 
+#ifdef CONFIG_OF
+static const struct of_device_id platform_lcd_dt_match[] = {
+	{ .compatible = "hydis,hv070wsa", .data = (void *)HV070WSA_DRV_DATA},
+	{},
+};
+MODULE_DEVICE_TABLE(of, platform_lcd_dt_match);
+#endif
+
 static struct platform_driver platform_lcd_driver = {
 	.driver		= {
 		.name	= "platform-lcd",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(platform_lcd_dt_match),
 	},
 	.probe		= platform_lcd_probe,
 	.remove		= __devexit_p(platform_lcd_remove),
-- 
1.6.6.rc2

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