Hi Joel,
On Fri, 2017-05-26 at 13:32 +1000, Joel Stanley wrote:
> This adds the bindings documentation for a basic single-register reset
> controller.
>
> The bindings describe a single 32-bit register that contains up to 32
> reset lines, each deasserted by clearing the appropriate bit in the
> register.
>
> Signed-off-by: Joel Stanley <j...@jms.id.au>
> ---
> .../devicetree/bindings/reset/reset-basic.txt | 31
> ++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/reset/reset-basic.txt
>
> diff --git a/Documentation/devicetree/bindings/reset/reset-basic.txt
> b/Documentation/devicetree/bindings/reset/reset-basic.txt
> new file mode 100644
> index 000000000000..7341e04e7904
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reset/reset-basic.txt
> @@ -0,0 +1,31 @@
> +Basic single-register reset controller
> +======================================
> +
> +This describes a generic reset controller where the reset lines are
> controlled
> +by single bits within a 32-bit memory location. The memory location is
> assumed
> +to be part of a syscon regmap.
There are a few more assumptions. First, that the reset line is asserted
by setting the corresponding bits, and that it is deasserted by clearing
them. Further, that the bits are not auto-clearing. And then, that the
same bit can be read back to provide the current reset line status.
> +Reset controller required properties:
> + - compatible: should be "reset-basic"
> + - #reset-cells: must be set to 1
> + - reg: reset register location within regmap
> +
> +Device node required properties:
> + - resets phandle
> + - bit number, counting from zero, for the desired reset line. Max is 31.
> +
> +Example:
> +
> +syscon {
> + compatible = "syscon";
> +
> + uart_rest: rest@0c {
The device node name should be "reset-controller", and leading zeroes
should be dropped from the address part:
uart_rest: reset-controller@c {
> + compatible = "reset-basic";
Maybe this is not necessary for the example, but the compatible should
contain a vendor/hardware specific string first.
> + #reset-cells = <1>;
> + reg = <0x0c>;
> + };
> +}
> +
> +&uart {
> + resets = <&uart_rest 0x04>;
I'd use decimal here.
regards
Philipp
