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Subject[PATCH 1/1] video/atmel_lcdfb: Introduce regulator support
Date
This adds regulator support to enable/disable the LCD voltage, using
'lcd-supply' as regulator name.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
---
.../devicetree/bindings/video/atmel,lcdc.txt | 3 +++
drivers/video/fbdev/atmel_lcdfb.c | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/video/atmel,lcdc.txt b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
index 1ec175eddca8..5ae0faf443c3 100644
--- a/Documentation/devicetree/bindings/video/atmel,lcdc.txt
+++ b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
@@ -20,6 +20,9 @@ Required nodes:
- default-mode: a videomode within the display with timing parameters
as specified below.

+Optional properties:
+- lcd-supply: Regulator for LCD supply voltage.
+
Example:

fb0: fb@0x00500000 {
diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c
index d36e830d6fc6..59fd2e062d4f 100644
--- a/drivers/video/fbdev/atmel_lcdfb.c
+++ b/drivers/video/fbdev/atmel_lcdfb.c
@@ -24,6 +24,7 @@
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <video/of_display_timing.h>
+#include <linux/regulator/consumer.h>
#include <video/videomode.h>

#include <mach/cpu.h>
@@ -60,6 +61,7 @@ struct atmel_lcdfb_info {
struct atmel_lcdfb_pdata pdata;

struct atmel_lcdfb_config *config;
+ struct regulator *reg_lcd;
};

struct atmel_lcdfb_power_ctrl_gpio {
@@ -302,10 +304,24 @@ static void init_contrast(struct atmel_lcdfb_info *sinfo)

static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
{
+ int ret;
struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;

if (pdata->atmel_lcdfb_power_control)
pdata->atmel_lcdfb_power_control(pdata, on);
+ else if (sinfo->reg_lcd) {
+ if (on) {
+ ret = regulator_enable(sinfo->reg_lcd);
+ if (ret)
+ dev_err(&sinfo->pdev->dev,
+ "lcd regulator enable failed: %d\n", ret);
+ } else {
+ ret = regulator_disable(sinfo->reg_lcd);
+ if (ret)
+ dev_err(&sinfo->pdev->dev,
+ "lcd regulator disable failed: %d\n", ret);
+ }
+ }
}

static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
@@ -1192,6 +1208,10 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
if (!sinfo->config)
goto free_info;

+ sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
+ if (IS_ERR(sinfo->reg_lcd))
+ sinfo->reg_lcd = NULL;
+
info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
info->pseudo_palette = sinfo->pseudo_palette;
info->fbops = &atmel_lcdfb_ops;
--
1.8.5.5


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