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 swar...@wwwdotorg.org
---
v2: Add binding doc, remove ifdefs from lcd.h
---
common/lcd.c | 87
.../video/simple-framebuffer.txt | 25 ++
include/lcd.h |3 +
3 files changed, 115 insertions(+)
create mode 100644 doc/device-tree-bindings/video/simple-framebuffer.txt
diff --git a/common/lcd.c b/common/lcd.c
index edae835..3a60484 100644
--- a/common/lcd.c
+++ b/common/lcd.c
@@ -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
diff --git a/doc/device-tree-bindings/video/simple-framebuffer.txt
b/doc/device-tree-bindings/video/simple-framebuffer.txt
new file mode 100644
index 000..3ea4605
--- /dev/null
+++ b/doc/device-tree-bindings/video/simple-framebuffer.txt
@@ -0,0 +1,25 @@
+Simple Framebuffer
+
+A simple frame-buffer describes a raw memory region that may be rendered to,
+with the assumption that the display hardware has already been set up to scan
+out from that buffer.
+
+Required properties:
+- compatible: simple-framebuffer
+- reg: Should contain the location and size of the framebuffer memory.
+- width: The width of the framebuffer in pixels.
+- height: The height of the framebuffer in pixels.
+- stride: The number of bytes in each line of the framebuffer.
+- format: The format of the framebuffer surface. Valid values are:
+ - r5g6b5 (16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b).
+
+Example:
+
+ framebuffer {
+ compatible = simple-framebuffer;
+ reg = 0x1d385000 (1600 * 1200 * 2);
+ width = 1600;
+ height = 1200;
+ stride = (1600 * 2);
+ format = r5g6b5;
+ };
diff --git a/include/lcd.h b/include/lcd.h
index
