On Tue, Oct 13, 2015 at 01:04:17AM +0800, Chen-Yu Tsai wrote:
> The physical display tied to the framebuffer may have regulators
> providing power to it, such as power for LCDs or interface conversion
> chips.
>
> The number of regulators in use may vary, but the regulator supply
> binding can not be a list. Work around this by adding a "num-supplies"
> property to communicate the number of supplies, and a list of 0 ~ N
> "vinN-supply" properties for the actual regulator supply.
This is getting more complicated by the minute...
> Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
> ---
> .../devicetree/bindings/video/simple-framebuffer.txt | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/video/simple-framebuffer.txt b/Documentation/devicetree/bindings/video/simple-framebuffer.txt
> index 4474ef6e0b95..0cc43e1be8b5 100644
> --- a/Documentation/devicetree/bindings/video/simple-framebuffer.txt
> +++ b/Documentation/devicetree/bindings/video/simple-framebuffer.txt
> @@ -47,10 +47,14 @@ Required properties:
> - a8b8g8r8 (32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r).
>
> Optional properties:
> -- clocks : List of clocks used by the framebuffer. Clocks listed here
> - are expected to already be configured correctly. The OS must
> - ensure these clocks are not modified or disabled while the
> - simple framebuffer remains active.
> +- clocks : List of clocks used by the framebuffer.
> +- num-supplies : The number of regulators used by the framebuffer.
> +- vinN-supply : The N-th (from 0) regulator used by the framebuffer.
I don't see why you need num-supplies. Why not just try probing
vin${N}-supply until such a property isn't present in the DT?
Thanks,
Mark.
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