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video: fbdev: pxafb: Add support for lcd-supply regulator

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Optionally obtain a lcd-supply regulator during probe and use it in
__pxafb_lcd_power() to switch the power supply of LCD panels.

This helps boards booted from DT to control such voltages without
callbacks.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Reviewed-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
This commit is contained in:
Daniel Mack 2018-07-24 19:11:26 +02:00 committed by Bartlomiej Zolnierkiewicz
parent a2f2058e3d
commit 31e1391af2
3 changed files with 30 additions and 0 deletions
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3
Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt
View File

@ -10,6 +10,9 @@ Required properties:
- interrupts : framebuffer controller interrupt.
- clocks: phandle to input clocks
Optional properties:
- lcd-supply: A phandle to a power regulator that controls the LCD voltage.
Required nodes:
- port: connection to the LCD panel (see video-interfaces.txt)
This node must have its properties bus-width and remote-endpoint set.

24
drivers/video/fbdev/pxafb.c
View File

@ -56,6 +56,7 @@
#include <linux/freezer.h>
#include <linux/console.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>
@ -1423,6 +1424,21 @@ static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
if (fbi->lcd_power)
fbi->lcd_power(on, &fbi->fb.var);
if (fbi->lcd_supply && fbi->lcd_supply_enabled != on) {
int ret;
if (on)
ret = regulator_enable(fbi->lcd_supply);
else
ret = regulator_disable(fbi->lcd_supply);
if (ret < 0)
pr_warn("Unable to %s LCD supply regulator: %d\n",
on ? "enable" : "disable", ret);
else
fbi->lcd_supply_enabled = on;
}
}
static void pxafb_enable_controller(struct pxafb_info *fbi)
@ -2299,6 +2315,14 @@ static int pxafb_probe(struct platform_device *dev)
fbi->backlight_power = inf->pxafb_backlight_power;
fbi->lcd_power = inf->pxafb_lcd_power;
fbi->lcd_supply = devm_regulator_get_optional(&dev->dev, "lcd");
if (IS_ERR(fbi->lcd_supply)) {
if (PTR_ERR(fbi->lcd_supply) == -EPROBE_DEFER)
return -EPROBE_DEFER;
fbi->lcd_supply = NULL;
}
r = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&dev->dev, "no I/O memory resource defined\n");

3
drivers/video/fbdev/pxafb.h
View File

@ -165,6 +165,9 @@ struct pxafb_info {
struct notifier_block freq_policy;
#endif
struct regulator *lcd_supply;
bool lcd_supply_enabled;
void (*lcd_power)(int, struct fb_var_screeninfo *);
void (*backlight_power)(int);