diff mbox series

[RFC,v1,3/3] dt-binding: display: Require two rests on mantix panel

Message ID 71a9108f3472ba9af4bead01b1b770d1e73eb08e.1600707235.git.agx@sigxcpu.org
State Changes Requested
Headers show
Series drm/panel: mantix panel reset fixes | expand

Checks

Context Check Description
robh/checkpatch success

Commit Message

Guido Günther Sept. 21, 2020, 4:55 p.m. UTC
We need to reset both for the panel to show an image.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
---
 .../bindings/display/panel/mantix,mlaf057we51-x.yaml       | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Comments

Fabio Estevam Sept. 21, 2020, 5:05 p.m. UTC | #1
Hi Guido,

On Mon, Sep 21, 2020 at 1:56 PM Guido Günther <agx@sigxcpu.org> wrote:
>
> We need to reset both for the panel to show an image.

There is a typo in "resets" in the Subject line.
Guido Günther Sept. 22, 2020, 11:38 a.m. UTC | #2
Hi,
On Mon, Sep 21, 2020 at 02:05:55PM -0300, Fabio Estevam wrote:
> Hi Guido,
> 
> On Mon, Sep 21, 2020 at 1:56 PM Guido Günther <agx@sigxcpu.org> wrote:
> >
> > We need to reset both for the panel to show an image.
> 
> There is a typo in "resets" in the Subject line.

Fix queued for v2. Thanks!
 -- Guido
Sam Ravnborg Sept. 24, 2020, 7:38 p.m. UTC | #3
Hi Guido.

On Mon, Sep 21, 2020 at 06:55:52PM +0200, Guido Günther wrote:
> We need to reset both for the panel to show an image.
> 
> Signed-off-by: Guido Günther <agx@sigxcpu.org>
> ---
>  .../bindings/display/panel/mantix,mlaf057we51-x.yaml       | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> index 937323cc9aaa..ba5a18fac9f9 100644
> --- a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> @@ -35,7 +35,9 @@ properties:
>    vddi-supply:
>      description: 1.8V I/O voltage supply
>  
> -  reset-gpios: true
> +  reset-gpios:
> +    minItems: 2
> +    maxItems: 2

reset-gpios is, as you already wrote, defined in panel-common.yaml.
Do not try to change it here.
It would be much better, I think, to introduce a mantix,reset-gpios
property.

This would avoid that we had two different reset-gpios definitions.

	Sam

>  
>    backlight: true
>  
> @@ -62,7 +64,8 @@ examples:
>              avdd-supply = <&reg_avdd>;
>              avee-supply = <&reg_avee>;
>              vddi-supply = <&reg_1v8_p>;
> -            reset-gpios = <&gpio1 29 GPIO_ACTIVE_LOW>;
> +            reset-gpios = <&gpio1 29 GPIO_ACTIVE_LOW>,
> +                          <&gpio1 24 GPIO_ACTIVE_LOW>;
>              backlight = <&backlight>;
>          };
>      };
> -- 
> 2.26.2
Thierry Reding Sept. 28, 2020, 6:50 a.m. UTC | #4
On Thu, Sep 24, 2020 at 09:38:07PM +0200, Sam Ravnborg wrote:
> Hi Guido.
> 
> On Mon, Sep 21, 2020 at 06:55:52PM +0200, Guido Günther wrote:
> > We need to reset both for the panel to show an image.
> > 
> > Signed-off-by: Guido Günther <agx@sigxcpu.org>
> > ---
> >  .../bindings/display/panel/mantix,mlaf057we51-x.yaml       | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > index 937323cc9aaa..ba5a18fac9f9 100644
> > --- a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > +++ b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > @@ -35,7 +35,9 @@ properties:
> >    vddi-supply:
> >      description: 1.8V I/O voltage supply
> >  
> > -  reset-gpios: true
> > +  reset-gpios:
> > +    minItems: 2
> > +    maxItems: 2
> 
> reset-gpios is, as you already wrote, defined in panel-common.yaml.
> Do not try to change it here.
> It would be much better, I think, to introduce a mantix,reset-gpios
> property.
> 
> This would avoid that we had two different reset-gpios definitions.

My understanding is that this will only override the defaults defined in
panel-common.yaml. So everything else about the
panel-common.yaml#/properties/reset-gpios definition remains valid and
all this does is say that when this matched on "mantix,mlaf057we51-x",
then the "reset-gpios" property is expected to contain two entries as
opposed to the single entry that is expected by default.

Thierry
Guido Günther Sept. 28, 2020, 3:02 p.m. UTC | #5
Hi Thierry,
On Mon, Sep 28, 2020 at 08:50:39AM +0200, Thierry Reding wrote:
> On Thu, Sep 24, 2020 at 09:38:07PM +0200, Sam Ravnborg wrote:
> > Hi Guido.
> > 
> > On Mon, Sep 21, 2020 at 06:55:52PM +0200, Guido Günther wrote:
> > > We need to reset both for the panel to show an image.
> > > 
> > > Signed-off-by: Guido Günther <agx@sigxcpu.org>
> > > ---
> > >  .../bindings/display/panel/mantix,mlaf057we51-x.yaml       | 7 +++++--
> > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > > index 937323cc9aaa..ba5a18fac9f9 100644
> > > --- a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > > +++ b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > > @@ -35,7 +35,9 @@ properties:
> > >    vddi-supply:
> > >      description: 1.8V I/O voltage supply
> > >  
> > > -  reset-gpios: true
> > > +  reset-gpios:
> > > +    minItems: 2
> > > +    maxItems: 2
> > 
> > reset-gpios is, as you already wrote, defined in panel-common.yaml.
> > Do not try to change it here.
> > It would be much better, I think, to introduce a mantix,reset-gpios
> > property.
> > 
> > This would avoid that we had two different reset-gpios definitions.
> 
> My understanding is that this will only override the defaults defined in
> panel-common.yaml. So everything else about the
> panel-common.yaml#/properties/reset-gpios definition remains valid and
> all this does is say that when this matched on "mantix,mlaf057we51-x",
> then the "reset-gpios" property is expected to contain two entries as
> opposed to the single entry that is expected by default.

I thought so too but I get:

linux/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.example.dt.yaml: panel@0: reset-gpios: [[4294967295, 29, 1], [4294967295, 24, 1]] is too long
	From schema: /.../linux/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml

It seems to bepossible to *extend* reset-gpios though because when i use
an example like:

            reset-gpios = <&gpio1 29 GPIO_ACTIVE_LOW>,
                          <&gpio1 24 GPIO_ACTIVE_LOW>;

i correctly get

linux/linux/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.example.dt.yaml: panel@0: reset-gpios: [[4294967295, 29, 1]] is too short
	From schema: /.../linux/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
 
so the `minItems: 2` is being picked up. This mens i can add
properties but i can't overwrite the existing `maxItems: 2` - that's why
i was wondering how that is supposed to work (if properties should be
overrideable from common files or not).
Cheers,
 -- Guido

> 
> Thierry
Rob Herring Sept. 29, 2020, 5:46 p.m. UTC | #6
On Thu, Sep 24, 2020 at 09:38:07PM +0200, Sam Ravnborg wrote:
> Hi Guido.
> 
> On Mon, Sep 21, 2020 at 06:55:52PM +0200, Guido Günther wrote:
> > We need to reset both for the panel to show an image.
> > 
> > Signed-off-by: Guido Günther <agx@sigxcpu.org>
> > ---
> >  .../bindings/display/panel/mantix,mlaf057we51-x.yaml       | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > index 937323cc9aaa..ba5a18fac9f9 100644
> > --- a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > +++ b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
> > @@ -35,7 +35,9 @@ properties:
> >    vddi-supply:
> >      description: 1.8V I/O voltage supply
> >  
> > -  reset-gpios: true
> > +  reset-gpios:
> > +    minItems: 2
> > +    maxItems: 2
> 
> reset-gpios is, as you already wrote, defined in panel-common.yaml.
> Do not try to change it here.
> It would be much better, I think, to introduce a mantix,reset-gpios
> property.

Yes.

You also need to define what each reset entry corresponds to as the 
assertion/deassertion order could be important. You might just do 2 
properties with <pinname>-gpios.

Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
index 937323cc9aaa..ba5a18fac9f9 100644
--- a/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
+++ b/Documentation/devicetree/bindings/display/panel/mantix,mlaf057we51-x.yaml
@@ -35,7 +35,9 @@  properties:
   vddi-supply:
     description: 1.8V I/O voltage supply
 
-  reset-gpios: true
+  reset-gpios:
+    minItems: 2
+    maxItems: 2
 
   backlight: true
 
@@ -62,7 +64,8 @@  examples:
             avdd-supply = <&reg_avdd>;
             avee-supply = <&reg_avee>;
             vddi-supply = <&reg_1v8_p>;
-            reset-gpios = <&gpio1 29 GPIO_ACTIVE_LOW>;
+            reset-gpios = <&gpio1 29 GPIO_ACTIVE_LOW>,
+                          <&gpio1 24 GPIO_ACTIVE_LOW>;
             backlight = <&backlight>;
         };
     };