video: atmel_lcdfb: add device tree suport
get display timings from device tree Use videomode helpers to get display timings and configurations from device tree Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD
Tomi Valkeinen
Родитель
ce3b64f5f1
Коммит
b985172b32
|
|
@ -0,0 +1,75 @@
|
|||
Atmel LCDC Framebuffer
|
||||
-----------------------------------------------------
|
||||
|
||||
Required properties:
|
||||
- compatible :
|
||||
"atmel,at91sam9261-lcdc" ,
|
||||
"atmel,at91sam9263-lcdc" ,
|
||||
"atmel,at91sam9g10-lcdc" ,
|
||||
"atmel,at91sam9g45-lcdc" ,
|
||||
"atmel,at91sam9g45es-lcdc" ,
|
||||
"atmel,at91sam9rl-lcdc" ,
|
||||
"atmel,at32ap-lcdc"
|
||||
- reg : Should contain 1 register ranges(address and length)
|
||||
- interrupts : framebuffer controller interrupt
|
||||
- display: a phandle pointing to the display node
|
||||
|
||||
Required nodes:
|
||||
- display: a display node is required to initialize the lcd panel
|
||||
This should be in the board dts.
|
||||
- default-mode: a videomode within the display with timing parameters
|
||||
as specified below.
|
||||
|
||||
Example:
|
||||
|
||||
fb0: fb@0x00500000 {
|
||||
compatible = "atmel,at91sam9g45-lcdc";
|
||||
reg = <0x00500000 0x1000>;
|
||||
interrupts = <23 3 0>;
|
||||
pinctrl-names = "default";
|
||||
pinctrl-0 = <&pinctrl_fb>;
|
||||
display = <&display0>;
|
||||
status = "okay";
|
||||
#address-cells = <1>;
|
||||
#size-cells = <1>;
|
||||
|
||||
};
|
||||
|
||||
Atmel LCDC Display
|
||||
-----------------------------------------------------
|
||||
Required properties (as per of_videomode_helper):
|
||||
|
||||
- atmel,dmacon: dma controler configuration
|
||||
- atmel,lcdcon2: lcd controler configuration
|
||||
- atmel,guard-time: lcd guard time (Delay in frame periods)
|
||||
- bits-per-pixel: lcd panel bit-depth.
|
||||
|
||||
Optional properties (as per of_videomode_helper):
|
||||
- atmel,lcdcon-backlight: enable backlight
|
||||
- atmel,lcd-wiring-mode: lcd wiring mode "RGB" or "BRG"
|
||||
- atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed)
|
||||
|
||||
Example:
|
||||
display0: display {
|
||||
bits-per-pixel = <32>;
|
||||
atmel,lcdcon-backlight;
|
||||
atmel,dmacon = <0x1>;
|
||||
atmel,lcdcon2 = <0x80008002>;
|
||||
atmel,guard-time = <9>;
|
||||
atmel,lcd-wiring-mode = <1>;
|
||||
|
||||
display-timings {
|
||||
native-mode = <&timing0>;
|
||||
timing0: timing0 {
|
||||
clock-frequency = <9000000>;
|
||||
hactive = <480>;
|
||||
vactive = <272>;
|
||||
hback-porch = <1>;
|
||||
hfront-porch = <1>;
|
||||
vback-porch = <40>;
|
||||
vfront-porch = <1>;
|
||||
hsync-len = <45>;
|
||||
vsync-len = <1>;
|
||||
};
|
||||
};
|
||||
};
|
||||
|
|
@ -996,6 +996,8 @@ config FB_ATMEL
|
|||
select FB_CFB_FILLRECT
|
||||
select FB_CFB_COPYAREA
|
||||
select FB_CFB_IMAGEBLIT
|
||||
select FB_MODE_HELPERS
|
||||
select VIDEOMODE_HELPERS
|
||||
help
|
||||
This enables support for the AT91/AT32 LCD Controller.
|
||||
|
||||
|
|
|
|||
|
|
@ -20,7 +20,11 @@
|
|||
#include <linux/gfp.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_data/atmel.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/of_gpio.h>
|
||||
#include <video/of_display_timing.h>
|
||||
#include <video/videomode.h>
|
||||
|
||||
#include <mach/cpu.h>
|
||||
#include <asm/gpio.h>
|
||||
|
|
@ -58,6 +62,13 @@ struct atmel_lcdfb_info {
|
|||
struct atmel_lcdfb_config *config;
|
||||
};
|
||||
|
||||
struct atmel_lcdfb_power_ctrl_gpio {
|
||||
int gpio;
|
||||
int active_low;
|
||||
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
#define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
|
||||
#define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
|
||||
|
||||
|
|
@ -953,16 +964,187 @@ static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
|
|||
clk_disable_unprepare(sinfo->lcdc_clk);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id atmel_lcdfb_dt_ids[] = {
|
||||
{ .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
|
||||
{ .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
|
||||
{ .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
|
||||
{ .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
|
||||
{ .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
|
||||
{ .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
|
||||
{ .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
|
||||
|
||||
static const char *atmel_lcdfb_wiring_modes[] = {
|
||||
[ATMEL_LCDC_WIRING_BGR] = "BRG",
|
||||
[ATMEL_LCDC_WIRING_RGB] = "RGB",
|
||||
};
|
||||
|
||||
const int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
|
||||
{
|
||||
const char *mode;
|
||||
int err, i;
|
||||
|
||||
err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
|
||||
if (err < 0)
|
||||
return ATMEL_LCDC_WIRING_BGR;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
|
||||
if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
|
||||
return i;
|
||||
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
|
||||
{
|
||||
struct atmel_lcdfb_power_ctrl_gpio *og;
|
||||
|
||||
list_for_each_entry(og, &pdata->pwr_gpios, list)
|
||||
gpio_set_value(og->gpio, on);
|
||||
}
|
||||
|
||||
static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
|
||||
{
|
||||
struct fb_info *info = sinfo->info;
|
||||
struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
|
||||
struct fb_var_screeninfo *var = &info->var;
|
||||
struct device *dev = &sinfo->pdev->dev;
|
||||
struct device_node *np =dev->of_node;
|
||||
struct device_node *display_np;
|
||||
struct device_node *timings_np;
|
||||
struct display_timings *timings;
|
||||
enum of_gpio_flags flags;
|
||||
struct atmel_lcdfb_power_ctrl_gpio *og;
|
||||
bool is_gpio_power = false;
|
||||
int ret = -ENOENT;
|
||||
int i, gpio;
|
||||
|
||||
sinfo->config = (struct atmel_lcdfb_config*)
|
||||
of_match_device(atmel_lcdfb_dt_ids, dev)->data;
|
||||
|
||||
display_np = of_parse_phandle(np, "display", 0);
|
||||
if (!display_np) {
|
||||
dev_err(dev, "failed to find display phandle\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to get property bits-per-pixel\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to get property atmel,guard-time\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to get property atmel,lcdcon2\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to get property bits-per-pixel\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
ret = -ENOMEM;
|
||||
for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
|
||||
gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
|
||||
i, &flags);
|
||||
if (gpio < 0)
|
||||
continue;
|
||||
|
||||
og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
|
||||
if (!og)
|
||||
goto put_display_node;
|
||||
|
||||
og->gpio = gpio;
|
||||
og->active_low = flags & OF_GPIO_ACTIVE_LOW;
|
||||
is_gpio_power = true;
|
||||
ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
|
||||
if (ret) {
|
||||
dev_err(dev, "request gpio %d failed\n", gpio);
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
ret = gpio_direction_output(gpio, og->active_low);
|
||||
if (ret) {
|
||||
dev_err(dev, "set direction output gpio %d failed\n", gpio);
|
||||
goto put_display_node;
|
||||
}
|
||||
}
|
||||
|
||||
if (is_gpio_power)
|
||||
pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
|
||||
|
||||
ret = atmel_lcdfb_get_of_wiring_modes(display_np);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
pdata->lcd_wiring_mode = ret;
|
||||
|
||||
pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
|
||||
|
||||
timings = of_get_display_timings(display_np);
|
||||
if (!timings) {
|
||||
dev_err(dev, "failed to get display timings\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
timings_np = of_find_node_by_name(display_np, "display-timings");
|
||||
if (!timings_np) {
|
||||
dev_err(dev, "failed to find display-timings node\n");
|
||||
goto put_display_node;
|
||||
}
|
||||
|
||||
for (i = 0; i < of_get_child_count(timings_np); i++) {
|
||||
struct videomode vm;
|
||||
struct fb_videomode fb_vm;
|
||||
|
||||
ret = videomode_from_timings(timings, &vm, i);
|
||||
if (ret < 0)
|
||||
goto put_timings_node;
|
||||
ret = fb_videomode_from_videomode(&vm, &fb_vm);
|
||||
if (ret < 0)
|
||||
goto put_timings_node;
|
||||
|
||||
fb_add_videomode(&fb_vm, &info->modelist);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
put_timings_node:
|
||||
of_node_put(timings_np);
|
||||
put_display_node:
|
||||
of_node_put(display_np);
|
||||
return ret;
|
||||
}
|
||||
#else
|
||||
static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct fb_info *info;
|
||||
struct atmel_lcdfb_info *sinfo;
|
||||
struct atmel_lcdfb_pdata *pdata;
|
||||
struct fb_videomode fbmode;
|
||||
struct atmel_lcdfb_pdata *pdata = NULL;
|
||||
struct resource *regs = NULL;
|
||||
struct resource *map = NULL;
|
||||
struct fb_modelist *modelist;
|
||||
int ret;
|
||||
|
||||
dev_dbg(dev, "%s BEGIN\n", __func__);
|
||||
|
|
@ -975,17 +1157,35 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
}
|
||||
|
||||
sinfo = info->par;
|
||||
sinfo->pdev = pdev;
|
||||
sinfo->info = info;
|
||||
|
||||
INIT_LIST_HEAD(&info->modelist);
|
||||
|
||||
if (pdev->dev.of_node) {
|
||||
ret = atmel_lcdfb_of_init(sinfo);
|
||||
if (ret)
|
||||
goto free_info;
|
||||
} else if (dev_get_platdata(dev)) {
|
||||
struct fb_monspecs *monspecs;
|
||||
int i;
|
||||
|
||||
if (dev_get_platdata(dev)) {
|
||||
pdata = dev_get_platdata(dev);
|
||||
monspecs = pdata->default_monspecs;
|
||||
sinfo->pdata = *pdata;
|
||||
|
||||
for (i = 0; i < monspecs->modedb_len; i++)
|
||||
fb_add_videomode(&monspecs->modedb[i], &info->modelist);
|
||||
|
||||
sinfo->config = atmel_lcdfb_get_config(pdev);
|
||||
|
||||
info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
|
||||
memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
|
||||
} else {
|
||||
dev_err(dev, "cannot get default configuration\n");
|
||||
goto free_info;
|
||||
}
|
||||
sinfo->info = info;
|
||||
sinfo->pdev = pdev;
|
||||
sinfo->config = atmel_lcdfb_get_config(pdev);
|
||||
|
||||
if (!sinfo->config)
|
||||
goto free_info;
|
||||
|
||||
|
|
@ -994,7 +1194,6 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
info->pseudo_palette = sinfo->pseudo_palette;
|
||||
info->fbops = &atmel_lcdfb_ops;
|
||||
|
||||
memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
|
||||
info->fix = atmel_lcdfb_fix;
|
||||
|
||||
/* Enable LCDC Clocks */
|
||||
|
|
@ -1010,14 +1209,11 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
}
|
||||
atmel_lcdfb_start_clock(sinfo);
|
||||
|
||||
ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
|
||||
info->monspecs.modedb_len, info->monspecs.modedb,
|
||||
pdata->default_bpp);
|
||||
if (!ret) {
|
||||
dev_err(dev, "no suitable video mode found\n");
|
||||
goto stop_clk;
|
||||
}
|
||||
modelist = list_first_entry(&info->modelist,
|
||||
struct fb_modelist, list);
|
||||
fb_videomode_to_var(&info->var, &modelist->mode);
|
||||
|
||||
atmel_lcdfb_check_var(&info->var, info);
|
||||
|
||||
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!regs) {
|
||||
|
|
@ -1101,18 +1297,6 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
goto unregister_irqs;
|
||||
}
|
||||
|
||||
/*
|
||||
* This makes sure that our colour bitfield
|
||||
* descriptors are correctly initialised.
|
||||
*/
|
||||
atmel_lcdfb_check_var(&info->var, info);
|
||||
|
||||
ret = fb_set_var(info, &info->var);
|
||||
if (ret) {
|
||||
dev_warn(dev, "unable to set display parameters\n");
|
||||
goto free_cmap;
|
||||
}
|
||||
|
||||
dev_set_drvdata(dev, info);
|
||||
|
||||
/*
|
||||
|
|
@ -1121,13 +1305,9 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
ret = register_framebuffer(info);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to register framebuffer device: %d\n", ret);
|
||||
goto free_cmap;
|
||||
goto reset_drvdata;
|
||||
}
|
||||
|
||||
/* add selected videomode to modelist */
|
||||
fb_var_to_videomode(&fbmode, &info->var);
|
||||
fb_add_videomode(&fbmode, &info->modelist);
|
||||
|
||||
/* Power up the LCDC screen */
|
||||
atmel_lcdfb_power_control(sinfo, 1);
|
||||
|
||||
|
|
@ -1136,7 +1316,8 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
|
|||
|
||||
return 0;
|
||||
|
||||
free_cmap:
|
||||
reset_drvdata:
|
||||
dev_set_drvdata(dev, NULL);
|
||||
fb_dealloc_cmap(&info->cmap);
|
||||
unregister_irqs:
|
||||
cancel_work_sync(&sinfo->task);
|
||||
|
|
@ -1254,6 +1435,7 @@ static struct platform_driver atmel_lcdfb_driver = {
|
|||
.driver = {
|
||||
.name = "atmel_lcdfb",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
|
||||
},
|
||||
};
|
||||
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче