tree 1ecdbe9525d593257712ff1c24b2f26accac925e
parent 2750585ca7bb880ca3f10b8ab0f15c8d3b481987
author Hannes Schmelzer <Hannes.Schmelzer@br-automation.com> 1496149544 +0200
committer Simon Glass <sjg@chromium.org> 1497037534 -0600

cmd/fdt: support single value replacement within an array

With this commit we can modify single values within an array of a dts
property.

This is useful if we have for example a pwm-backlight where we want to
modifiy the pwm frequency per u-boot script.

The pwm is described in dts like this:

backlight {
	pwms = <0x0000002b 0x00000000 0x004c4b40>;
};

For changing the frequency, here the 3rd parameter, we simply type:

fdt set /backlight pwms <? ? 0x1E8480>;

For doing all this we:
- backup the property content into our 'SCRATCHPAD'
- only modify the array-cell if the new content doesn't start with '?'

Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
Reviewed-by: Simon Glass <sjg@chromium.org>