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lcd: add functions to set up simplefb device tree
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>
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87
common/lcd.c
87
common/lcd.c
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@ -57,6 +57,10 @@
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#include <atmel_lcdc.h>
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#endif
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#if defined(CONFIG_LCD_DT_SIMPLEFB)
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#include <libfdt.h>
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#endif
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/************************************************************************/
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/* ** FONT DATA */
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/************************************************************************/
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@ -1182,3 +1186,86 @@ int lcd_get_screen_columns(void)
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{
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return CONSOLE_COLS;
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}
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#if defined(CONFIG_LCD_DT_SIMPLEFB)
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static int lcd_dt_simplefb_configure_node(void *blob, int off)
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{
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u32 stride;
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fdt32_t cells[2];
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int ret;
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const char format[] =
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#if LCD_BPP == LCD_COLOR16
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"r5g6b5";
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#else
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"";
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#endif
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if (!format[0])
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return -1;
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stride = panel_info.vl_col * 2;
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cells[0] = cpu_to_fdt32(gd->fb_base);
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cells[1] = cpu_to_fdt32(stride * panel_info.vl_row);
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ret = fdt_setprop(blob, off, "reg", cells, sizeof(cells[0]) * 2);
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if (ret < 0)
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return -1;
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cells[0] = cpu_to_fdt32(panel_info.vl_col);
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ret = fdt_setprop(blob, off, "width", cells, sizeof(cells[0]));
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if (ret < 0)
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return -1;
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cells[0] = cpu_to_fdt32(panel_info.vl_row);
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ret = fdt_setprop(blob, off, "height", cells, sizeof(cells[0]));
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if (ret < 0)
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return -1;
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cells[0] = cpu_to_fdt32(stride);
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ret = fdt_setprop(blob, off, "stride", cells, sizeof(cells[0]));
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if (ret < 0)
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return -1;
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ret = fdt_setprop(blob, off, "format", format, strlen(format) + 1);
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if (ret < 0)
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return -1;
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ret = fdt_delprop(blob, off, "status");
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if (ret < 0)
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return -1;
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return 0;
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}
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int lcd_dt_simplefb_add_node(void *blob)
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{
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const char compat[] = "simple-framebuffer";
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const char disabled[] = "disabled";
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int off, ret;
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off = fdt_add_subnode(blob, 0, "framebuffer");
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if (off < 0)
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return -1;
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ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
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if (ret < 0)
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return -1;
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ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
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if (ret < 0)
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return -1;
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return lcd_dt_simplefb_configure_node(blob, off);
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}
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int lcd_dt_simplefb_enable_existing_node(void *blob)
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{
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int off;
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off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
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if (off < 0)
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return -1;
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return lcd_dt_simplefb_configure_node(blob, off);
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}
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#endif
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25
doc/device-tree-bindings/video/simple-framebuffer.txt
Normal file
25
doc/device-tree-bindings/video/simple-framebuffer.txt
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Simple Framebuffer
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A simple frame-buffer describes a raw memory region that may be rendered to,
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with the assumption that the display hardware has already been set up to scan
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out from that buffer.
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Required properties:
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- compatible: "simple-framebuffer"
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- reg: Should contain the location and size of the framebuffer memory.
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- width: The width of the framebuffer in pixels.
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- height: The height of the framebuffer in pixels.
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- stride: The number of bytes in each line of the framebuffer.
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- format: The format of the framebuffer surface. Valid values are:
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- r5g6b5 (16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b).
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Example:
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framebuffer {
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compatible = "simple-framebuffer";
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reg = <0x1d385000 (1600 * 1200 * 2)>;
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width = <1600>;
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height = <1200>;
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stride = <(1600 * 2)>;
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format = "r5g6b5";
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};
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@ -324,6 +324,9 @@ void lcd_show_board_info(void);
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/* Return the size of the LCD frame buffer, and the line length */
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int lcd_get_size(int *line_length);
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int lcd_dt_simplefb_add_node(void *blob);
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int lcd_dt_simplefb_enable_existing_node(void *blob);
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/************************************************************************/
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/* ** BITMAP DISPLAY SUPPORT */
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/************************************************************************/
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