Commit 4344429d authored by Fabio Estevam's avatar Fabio Estevam Committed by Shawn Guo

video: mxsfb: Introduce regulator support

Instead of using a custom binding for retrieving the GPIO that activates the
LCD from devicetree, use a standard regulator.

This approach has the advantage to be more generic.

For example: in the case of a board that has a PMIC supplying the LCD voltage,
the current approach would not work, as it only searches for a GPIO pin.
Signed-off-by: default avatarFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent ac77bc22
......@@ -7,9 +7,6 @@ Required properties:
- interrupts: Should contain lcdif interrupts
- display : phandle to display node (see below for details)
Optional properties:
- panel-enable-gpios : Should specify the gpio for panel enable
* display node
Required properties:
......@@ -25,7 +22,6 @@ lcdif@80030000 {
compatible = "fsl,imx28-lcdif";
reg = <0x80030000 2000>;
interrupts = <38 86>;
panel-enable-gpios = <&gpio3 30 0>;
display: display {
bits-per-pixel = <32>;
......
......@@ -59,7 +59,7 @@ hog_pins_a: hog@0 {
lcdif@80030000 {
pinctrl-names = "default";
pinctrl-0 = <&lcdif_24bit_pins_a>;
panel-enable-gpios = <&gpio1 18 0>;
lcd-supply = <&reg_lcd_3v3>;
display = <&display>;
status = "okay";
......@@ -120,6 +120,15 @@ reg_vddio_sd0: vddio-sd0 {
regulator-max-microvolt = <3300000>;
gpio = <&gpio1 29 0>;
};
reg_lcd_3v3: lcd-3v3 {
compatible = "regulator-fixed";
regulator-name = "lcd-3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpio = <&gpio1 18 0>;
enable-active-high;
};
};
backlight {
......
......@@ -123,7 +123,7 @@ lcdif@80030000 {
pinctrl-names = "default";
pinctrl-0 = <&lcdif_24bit_pins_a
&lcdif_pins_evk>;
panel-enable-gpios = <&gpio3 30 0>;
lcd-supply = <&reg_lcd_3v3>;
display = <&display>;
status = "okay";
......@@ -310,6 +310,15 @@ reg_usb1_vbus: usb1_vbus {
gpio = <&gpio3 8 0>;
enable-active-high;
};
reg_lcd_3v3: lcd-3v3 {
compatible = "regulator-fixed";
regulator-name = "lcd-3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpio = <&gpio3 30 0>;
enable-active-high;
};
};
sound {
......
......@@ -42,7 +42,6 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <video/of_display_timing.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
......@@ -50,6 +49,7 @@
#include <linux/io.h>
#include <linux/pinctrl/consumer.h>
#include <linux/fb.h>
#include <linux/regulator/consumer.h>
#include <video/videomode.h>
#define REG_SET 4
......@@ -179,6 +179,7 @@ struct mxsfb_info {
unsigned dotclk_delay;
const struct mxsfb_devdata *devdata;
u32 sync;
struct regulator *reg_lcd;
};
#define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
......@@ -338,9 +339,19 @@ static void mxsfb_enable_controller(struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
u32 reg;
int ret;
dev_dbg(&host->pdev->dev, "%s\n", __func__);
if (host->reg_lcd) {
ret = regulator_enable(host->reg_lcd);
if (ret) {
dev_err(&host->pdev->dev,
"lcd regulator enable failed: %d\n", ret);
return;
}
}
clk_prepare_enable(host->clk);
clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
......@@ -362,6 +373,7 @@ static void mxsfb_disable_controller(struct fb_info *fb_info)
struct mxsfb_info *host = to_imxfb_host(fb_info);
unsigned loop;
u32 reg;
int ret;
dev_dbg(&host->pdev->dev, "%s\n", __func__);
......@@ -385,6 +397,13 @@ static void mxsfb_disable_controller(struct fb_info *fb_info)
clk_disable_unprepare(host->clk);
host->enabled = 0;
if (host->reg_lcd) {
ret = regulator_disable(host->reg_lcd);
if (ret)
dev_err(&host->pdev->dev,
"lcd regulator disable failed: %d\n", ret);
}
}
static int mxsfb_set_par(struct fb_info *fb_info)
......@@ -859,8 +878,6 @@ static int mxsfb_probe(struct platform_device *pdev)
struct fb_info *fb_info;
struct fb_modelist *modelist;
struct pinctrl *pinctrl;
int panel_enable;
enum of_gpio_flags flags;
int ret;
if (of_id)
......@@ -904,21 +921,9 @@ static int mxsfb_probe(struct platform_device *pdev)
goto fb_release;
}
panel_enable = of_get_named_gpio_flags(pdev->dev.of_node,
"panel-enable-gpios", 0, &flags);
if (gpio_is_valid(panel_enable)) {
unsigned long f = GPIOF_OUT_INIT_HIGH;
if (flags == OF_GPIO_ACTIVE_LOW)
f = GPIOF_OUT_INIT_LOW;
ret = devm_gpio_request_one(&pdev->dev, panel_enable,
f, "panel-enable");
if (ret) {
dev_err(&pdev->dev,
"failed to request gpio %d: %d\n",
panel_enable, ret);
goto fb_release;
}
}
host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
if (IS_ERR(host->reg_lcd))
host->reg_lcd = NULL;
fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
GFP_KERNEL);
......
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