[U-Boot] [PATCH 1/2] lcd: add functions to setup up simplefb device tree

[Stephen Warren]

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 at 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