dt-bindings: pwm: Fix cros-ec-pwm example dtc 'reg' warning

The example for the CrOS EC PWM is incomplete and now generates a dtc
warning:

Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.example.dts:17.11-23.11:
Warning (unit_address_vs_reg): /example-0/cros-ec@0: node has a unit name, but no reg or ranges property

Fixing this results in more warnings as a parent spi node is needed as
well.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Benson Leung <bleung@chromium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: linux-pwm@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
 .../bindings/pwm/google,cros-ec-pwm.yaml        | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

Hello Rob,

On Wed, Apr 15, 2020 at 01:26:39PM -0500, Rob Herring wrote:
> The example for the CrOS EC PWM is incomplete and now generates a dtc
> warning:
> 
> Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.example.dts:17.11-23.11:
> Warning (unit_address_vs_reg): /example-0/cros-ec@0: node has a unit name, but no reg or ranges property
> 
> Fixing this results in more warnings as a parent spi node is needed as
> well.
> 
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> Cc: Benson Leung <bleung@chromium.org>
> Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Cc: Guenter Roeck <groeck@chromium.org>
> Cc: linux-pwm@vger.kernel.org
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  .../bindings/pwm/google,cros-ec-pwm.yaml        | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> index 24c217b76580..41ece1d85315 100644
> --- a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> +++ b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> @@ -31,10 +31,17 @@ additionalProperties: false
>  
>  examples:
>    - |
> -    cros-ec@0 {
> -        compatible = "google,cros-ec-spi";
> -        cros_ec_pwm: ec-pwm {
> -            compatible = "google,cros-ec-pwm";
> -            #pwm-cells = <1>;
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        cros-ec@0 {
> +            compatible = "google,cros-ec-spi";
> +            reg = <0>;
> +
> +            cros_ec_pwm: ec-pwm {
> +                compatible = "google,cros-ec-pwm";
> +                #pwm-cells = <1>;
> +            };

Looks reasonable

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Is this supposed to go via the pwm tree, or do you apply yourself via a
device-tree tree?

Best regards
Uwe

On Wed, Apr 15, 2020 at 2:29 PM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
> Hello Rob,
>
> On Wed, Apr 15, 2020 at 01:26:39PM -0500, Rob Herring wrote:
> > The example for the CrOS EC PWM is incomplete and now generates a dtc
> > warning:
> >
> > Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.example.dts:17.11-23.11:
> > Warning (unit_address_vs_reg): /example-0/cros-ec@0: node has a unit name, but no reg or ranges property
> >
> > Fixing this results in more warnings as a parent spi node is needed as
> > well.
> >
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> > Cc: Benson Leung <bleung@chromium.org>
> > Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> > Cc: Guenter Roeck <groeck@chromium.org>
> > Cc: linux-pwm@vger.kernel.org
> > Signed-off-by: Rob Herring <robh@kernel.org>
> > ---
> >  .../bindings/pwm/google,cros-ec-pwm.yaml        | 17 ++++++++++++-----
> >  1 file changed, 12 insertions(+), 5 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> > index 24c217b76580..41ece1d85315 100644
> > --- a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> > +++ b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.yaml
> > @@ -31,10 +31,17 @@ additionalProperties: false
> >
> >  examples:
> >    - |
> > -    cros-ec@0 {
> > -        compatible = "google,cros-ec-spi";
> > -        cros_ec_pwm: ec-pwm {
> > -            compatible = "google,cros-ec-pwm";
> > -            #pwm-cells = <1>;
> > +    spi {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        cros-ec@0 {
> > +            compatible = "google,cros-ec-spi";
> > +            reg = <0>;
> > +
> > +            cros_ec_pwm: ec-pwm {
> > +                compatible = "google,cros-ec-pwm";
> > +                #pwm-cells = <1>;
> > +            };
>
> Looks reasonable
>
> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Thanks.

> Is this supposed to go via the pwm tree, or do you apply yourself via a
> device-tree tree?

I'll take it for rc2.

Rob