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video: mxsfb: add simple device tree probe

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Add a simple device tree probe support for mxsfb driver.  Before
a common binding for struct fb_videomode is available, the driver will
keep using struct mxsfb_platform_data.  That said, platform code will
use auxdata to attach mxsfb_platform_data for device tree boot.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Shawn Guo 2012-06-25 19:54:35 +08:00
parent ce4409b582
commit 73fc610f9a
2 changed files with 66 additions and 13 deletions
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19
Documentation/devicetree/bindings/fb/mxsfb.txt Normal file
View File

@ -0,0 +1,19 @@
* Freescale MXS LCD Interface (LCDIF)
Required properties:
- compatible: Should be "fsl,<chip>-lcdif". Supported chips include
imx23 and imx28.
- reg: Address and length of the register set for lcdif
- interrupts: Should contain lcdif interrupts
Optional properties:
- panel-enable-gpios : Should specify the gpio for panel enable
Examples:
lcdif@80030000 {
compatible = "fsl,imx28-lcdif";
reg = <0x80030000 2000>;
interrupts = <38 86>;
panel-enable-gpios = <&gpio3 30 0>;
};

60
drivers/video/mxsfb.c
View File

@ -41,6 +41,8 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
@ -750,16 +752,43 @@ static void __devexit mxsfb_free_videomem(struct mxsfb_info *host)
}
}
static struct platform_device_id mxsfb_devtype[] = {
{
.name = "imx23-fb",
.driver_data = MXSFB_V3,
}, {
.name = "imx28-fb",
.driver_data = MXSFB_V4,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
static const struct of_device_id mxsfb_dt_ids[] = {
{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
static int __devinit mxsfb_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(mxsfb_dt_ids, &pdev->dev);
struct mxsfb_platform_data *pdata = pdev->dev.platform_data;
struct resource *res;
struct mxsfb_info *host;
struct fb_info *fb_info;
struct fb_modelist *modelist;
struct pinctrl *pinctrl;
int panel_enable;
enum of_gpio_flags flags;
int i, ret;
if (of_id)
pdev->id_entry = of_id->data;
if (!pdata) {
dev_err(&pdev->dev, "No platformdata. Giving up\n");
return -ENODEV;
@ -807,6 +836,22 @@ static int __devinit mxsfb_probe(struct platform_device *pdev)
goto error_getclock;
}
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 error_panel_enable;
}
}
fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
if (!fb_info->pseudo_palette) {
ret = -ENOMEM;
@ -854,6 +899,7 @@ error_register:
error_init_fb:
kfree(fb_info->pseudo_palette);
error_pseudo_pallette:
error_panel_enable:
clk_put(host->clk);
error_getclock:
error_getpin:
@ -901,19 +947,6 @@ static void mxsfb_shutdown(struct platform_device *pdev)
writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
}
static struct platform_device_id mxsfb_devtype[] = {
{
.name = "imx23-fb",
.driver_data = MXSFB_V3,
}, {
.name = "imx28-fb",
.driver_data = MXSFB_V4,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
static struct platform_driver mxsfb_driver = {
.probe = mxsfb_probe,
.remove = __devexit_p(mxsfb_remove),
@ -921,6 +954,7 @@ static struct platform_driver mxsfb_driver = {
.id_table = mxsfb_devtype,
.driver = {
.name = DRIVER_NAME,
.of_match_table = mxsfb_dt_ids,
},
};