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fdt_support: Add a fdt_setup_simplefb_node helper function

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Add a generic helper to fill and enable simplefb nodes.

The first user of this will be the sunxi display code.

lcd_dt_simplefb_configure_node is also a good candidate to be converted
to use this, but that requires someone to run some tests first, as
lcd_dt_simplefb_configure_node does not honor #address-cells and #size-cells,
but simply assumes 1 and 1 for both.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Hans de Goede 2014-11-17 15:29:11 +01:00
parent 211717a463
commit d4f495a881
2 changed files with 65 additions and 0 deletions
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62
common/fdt_support.c
View File

@ -1524,3 +1524,65 @@ int fdt_read_range(void *fdt, int node, int n, uint64_t *child_addr,
return 0;
}
/**
* fdt_setup_simplefb_node - Fill and enable a simplefb node
*
* @fdt: ptr to device tree
* @node: offset of the simplefb node
* @base_address: framebuffer base address
* @width: width in pixels
* @height: height in pixels
* @stride: bytes per line
* @format: pixel format string
*
* Convenience function to fill and enable a simplefb node.
*/
int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
u32 height, u32 stride, const char *format)
{
char name[32];
fdt32_t cells[4];
int i, addrc, sizec, ret;
of_bus_default_count_cells(fdt, fdt_parent_offset(fdt, node),
&addrc, &sizec);
i = 0;
if (addrc == 2)
cells[i++] = cpu_to_fdt32(base_address >> 32);
cells[i++] = cpu_to_fdt32(base_address);
if (sizec == 2)
cells[i++] = 0;
cells[i++] = cpu_to_fdt32(height * stride);
ret = fdt_setprop(fdt, node, "reg", cells, sizeof(cells[0]) * i);
if (ret < 0)
return ret;
snprintf(name, sizeof(name), "framebuffer@%llx", base_address);
ret = fdt_set_name(fdt, node, name);
if (ret < 0)
return ret;
ret = fdt_setprop_u32(fdt, node, "width", width);
if (ret < 0)
return ret;
ret = fdt_setprop_u32(fdt, node, "height", height);
if (ret < 0)
return ret;
ret = fdt_setprop_u32(fdt, node, "stride", stride);
if (ret < 0)
return ret;
ret = fdt_setprop_string(fdt, node, "format", format);
if (ret < 0)
return ret;
ret = fdt_setprop_string(fdt, node, "status", "okay");
if (ret < 0)
return ret;
return 0;
}

3
include/fdt_support.h
View File

@ -147,6 +147,9 @@ void of_bus_default_count_cells(void *blob, int parentoffset,
int ft_verify_fdt(void *fdt);
int arch_fixup_memory_node(void *blob);
int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
u32 height, u32 stride, const char *format);
#endif /* ifdef CONFIG_OF_LIBFDT */
#ifdef USE_HOSTCC