Hi Chunyan,
On Wed, Jun 14, 2017 at 11:21 AM, Chunyan Zhang
<[email protected]> wrote:
> The value of property 'clock-cells' is not determined only by the number
> of clock outputs in one clock node, it is determined by whether the clock
> output in this node can be referenced directly without index. If the
> output clock has to be referenced by a index, the clock-cell of this
> clock node can't be defined 0.
>
> Signed-off-by: Chunyan Zhang <[email protected]>
> ---
> Documentation/devicetree/bindings/clock/clock-bindings.txt | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/clock/clock-bindings.txt
> b/Documentation/devicetree/bindings/clock/clock-bindings.txt
> index 2ec489e..e2b76b4 100644
> --- a/Documentation/devicetree/bindings/clock/clock-bindings.txt
> +++ b/Documentation/devicetree/bindings/clock/clock-bindings.txt
> @@ -18,6 +18,9 @@ Required properties:
> with a single clock output and 1 for nodes with multiple
> clock outputs.
>
> + There's one exception, please see the description for
> + clock-indices below.
> +
> Optional properties:
> clock-output-names: Recommended to be a list of strings of clock output
> signal
> names indexed by the first cell in the clock specifier.
> @@ -48,6 +51,13 @@ clock-indices: If the identifying number for the
> clocks in the node
> is not linear from zero, then this allows the mapping of
> identifiers into the clock-output-names array.
>
> + This property not only servers for clocks with multiple
serves
> + clock outputs, but also for clocks with a single clock
> + output whose identifying number is not zero.
Why would you want a single clock and a non-zero identifying number?
> + So long as clock-indices is set, clock-cells cannot be
> + set zero.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
