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lcd: add functions to set up simplefb device tree

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simple-framebuffer is a new device tree binding that describes a pre-
configured frame-buffer memory region and its format. The Linux kernel
contains a driver that supports this binding. Implement functions to
create a DT node (or fill in an existing node) with parameters that
describe the framebuffer format that U-Boot is using.

This will be immediately used by the Raspberry Pi board in U-Boot, and
likely will be used by the Samsung ARM ChromeBook support soon too. It
could well be used by many other boards (e.g. Tegra boards with built-in
LCD panels, which aren't yet supported by the Linux kernel).

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stephen Warren
2013-05-27 18:31:17 +00:00
committed by Anatolij Gustschin
parent db0d47dd43
commit 6a195d2d8a
3 changed files with 115 additions and 0 deletions
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87
common/lcd.c
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@@ -57,6 +57,10 @@
#include <atmel_lcdc.h>
#endif
#if defined(CONFIG_LCD_DT_SIMPLEFB)
#include <libfdt.h>
#endif
/************************************************************************/
/* ** FONT DATA */
/************************************************************************/
@@ -1182,3 +1186,86 @@ int lcd_get_screen_columns(void)
{
return CONSOLE_COLS;
}
#if defined(CONFIG_LCD_DT_SIMPLEFB)
static int lcd_dt_simplefb_configure_node(void *blob, int off)
{
u32 stride;
fdt32_t cells[2];
int ret;
const char format[] =
#if LCD_BPP == LCD_COLOR16
"r5g6b5";
#else
"";
#endif
if (!format[0])
return -1;
stride = panel_info.vl_col * 2;
cells[0] = cpu_to_fdt32(gd->fb_base);
cells[1] = cpu_to_fdt32(stride * panel_info.vl_row);
ret = fdt_setprop(blob, off, "reg", cells, sizeof(cells[0]) * 2);
if (ret < 0)
return -1;
cells[0] = cpu_to_fdt32(panel_info.vl_col);
ret = fdt_setprop(blob, off, "width", cells, sizeof(cells[0]));
if (ret < 0)
return -1;
cells[0] = cpu_to_fdt32(panel_info.vl_row);
ret = fdt_setprop(blob, off, "height", cells, sizeof(cells[0]));
if (ret < 0)
return -1;
cells[0] = cpu_to_fdt32(stride);
ret = fdt_setprop(blob, off, "stride", cells, sizeof(cells[0]));
if (ret < 0)
return -1;
ret = fdt_setprop(blob, off, "format", format, strlen(format) + 1);
if (ret < 0)
return -1;
ret = fdt_delprop(blob, off, "status");
if (ret < 0)
return -1;
return 0;
}
int lcd_dt_simplefb_add_node(void *blob)
{
const char compat[] = "simple-framebuffer";
const char disabled[] = "disabled";
int off, ret;
off = fdt_add_subnode(blob, 0, "framebuffer");
if (off < 0)
return -1;
ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
if (ret < 0)
return -1;
ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
if (ret < 0)
return -1;
return lcd_dt_simplefb_configure_node(blob, off);
}
int lcd_dt_simplefb_enable_existing_node(void *blob)
{
int off;
off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
if (off < 0)
return -1;
return lcd_dt_simplefb_configure_node(blob, off);
}
#endif