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sandbox: Support changing the LCD colour depth

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Add a new device-tree property to control the colour depth. At present we
support 16bpp and 32bpp.

While we are here, update the code to use livetree.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Simon Glass 2020-02-03 07:36:14 -07:00
parent 6be88c7282
commit a466db5adb
3 changed files with 9 additions and 6 deletions
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1
arch/sandbox/dts/sandbox.dtsi
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@ -83,6 +83,7 @@
compatible = "sandbox,lcd-sdl";
xres = <1366>;
yres = <768>;
log2-depth = <5>;
};
leds {

6
doc/device-tree-bindings/video/sandbox-fb.txt
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@ -2,7 +2,10 @@ Sandbox LCD
===========
This uses the displaymode.txt binding except that only xres and yres are
required properties.
required properties. Also an additional optional property is defined:
log2-depth: Log base 2 of the U-Boot display buffer depth (4=16bpp, 5=32bpp).
If not provided, a value of 4 is used.
Example:
@ -10,4 +13,5 @@ Example:
compatible = "sandbox,lcd-sdl";
xres = <800>;
yres = <600>;
log2-depth = <5>;
};

8
drivers/video/sandbox_sdl.c
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@ -47,13 +47,11 @@ static int sandbox_sdl_bind(struct udevice *dev)
{
struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
struct sandbox_sdl_plat *plat = dev_get_platdata(dev);
const void *blob = gd->fdt_blob;
int node = dev_of_offset(dev);
int ret = 0;
plat->xres = fdtdec_get_int(blob, node, "xres", LCD_MAX_WIDTH);
plat->yres = fdtdec_get_int(blob, node, "yres", LCD_MAX_HEIGHT);
plat->bpix = VIDEO_BPP16;
plat->xres = dev_read_u32_default(dev, "xres", LCD_MAX_WIDTH);
plat->yres = dev_read_u32_default(dev, "yres", LCD_MAX_HEIGHT);
plat->bpix = dev_read_u32_default(dev, "log2-depth", VIDEO_BPP16);
uc_plat->size = plat->xres * plat->yres * (1 << plat->bpix) / 8;
debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);