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>
---
common/lcd.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/lcd.h | 5 ++++
2 files changed, 92 insertions(+)
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/include/lcd.h b/include/lcd.h
index c6e7fc5..7c5410d 100644
--- a/include/lcd.h
+++ b/include/lcd.h
@@ -324,6 +324,11 @@ void lcd_show_board_info(void);
/* Return the size of the LCD frame buffer, and the line length */
int lcd_get_size(int *line_length);
+#if defined(CONFIG_LCD_DT_SIMPLEFB)
+int lcd_dt_simplefb_add_node(void *blob);
+int lcd_dt_simplefb_enable_existing_node(void *blob);
+#endif
+
/************************************************************************/
/* ** BITMAP DISPLAY SUPPORT */
/************************************************************************/
--
1.7.10.4
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