diff mbox series

[2/3] dt-bindings: timer: sifive,clint: add compatible for OpenC906

Message ID 20221121041757.418645-3-uwu@icenowy.me
State New
Headers show
Series Some DT binding quirks for T-Head C9xx | expand

Commit Message

Icenowy Zheng Nov. 21, 2022, 4:17 a.m. UTC
T-Head OpenC906 is a open-source-licensed fixed-configuration of C906,
which is now public and able to be integrated.

Add a compatible for the CLINT shipped as part of OpenC906, which should
just be ordinary C9xx CLINT.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
---
 Documentation/devicetree/bindings/timer/sifive,clint.yaml | 1 +
 1 file changed, 1 insertion(+)

Comments

Rob Herring Nov. 30, 2022, 6:13 p.m. UTC | #1
On Tue, Nov 22, 2022 at 03:41:27PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2022年11月22日 GMT+08:00 下午3:35:48, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> 写到:
> >On 22/11/2022 08:18, Icenowy Zheng wrote:
> >> 在 2022-11-21星期一的 11:06 +0100,Krzysztof Kozlowski写道:
> >>> On 21/11/2022 05:17, Icenowy Zheng wrote:
> >>>> T-Head OpenC906 is a open-source-licensed fixed-configuration of
> >>>> C906,
> >>>> which is now public and able to be integrated.
> >>>>
> >>>> Add a compatible for the CLINT shipped as part of OpenC906, which
> >>>> should
> >>>> just be ordinary C9xx CLINT.
> >>>>
> >>>> Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
> >>>> ---
> >>>>  Documentation/devicetree/bindings/timer/sifive,clint.yaml | 1 +
> >>>>  1 file changed, 1 insertion(+)
> >>>>
> >>>> diff --git
> >>>> a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> >>>> b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> >>>> index aada6957216c..86703e995e31 100644
> >>>> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> >>>> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> >>>> @@ -35,6 +35,7 @@ properties:
> >>>>            - const: sifive,clint0
> >>>>        - items:
> >>>>            - enum:
> >>>> +              - thead,openc906-clint
> >>>>                - allwinner,sun20i-d1-clint
> >>>
> >>> Add entries sorted alphabetically. This should be squashed with
> >>> previous
> >>> patch.
> >> 
> >> I make it a seperated patch because I think it's a questionable
> >> approach.
> >> 
> >> If you think it's okay, I will just squash it and put it as the second
> >> patch in the next iteration, with adding openc906-plic as the first
> >> one.
> >
> >What is a questionable approach? Why commit msg is not saying this?
> 
> Ah I mentioned it in the cover letter. The problem is just I doubt whether
> binding strings for single SoCs are necessary.

They are.

Unless all the quirks/bugs/features are somehow guaranteed to be exactly 
the same as other SoCs sharing the same compatible string, or there is 
another mechanism to identify the exact version (e.g. a version 
register).

Rob
Conor Dooley Dec. 1, 2022, 7:18 p.m. UTC | #2
On Wed, Nov 30, 2022 at 12:13:30PM -0600, Rob Herring wrote:
> On Tue, Nov 22, 2022 at 03:41:27PM +0800, Icenowy Zheng wrote:
> > 
> > 
> > 于 2022年11月22日 GMT+08:00 下午3:35:48, Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> 写到:
> > >On 22/11/2022 08:18, Icenowy Zheng wrote:
> > >> 在 2022-11-21星期一的 11:06 +0100,Krzysztof Kozlowski写道:
> > >>> On 21/11/2022 05:17, Icenowy Zheng wrote:
> > >>>> T-Head OpenC906 is a open-source-licensed fixed-configuration of
> > >>>> C906,
> > >>>> which is now public and able to be integrated.
> > >>>>
> > >>>> Add a compatible for the CLINT shipped as part of OpenC906, which
> > >>>> should
> > >>>> just be ordinary C9xx CLINT.
> > >>>>
> > >>>> Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
> > >>>> ---
> > >>>>  Documentation/devicetree/bindings/timer/sifive,clint.yaml | 1 +
> > >>>>  1 file changed, 1 insertion(+)
> > >>>>
> > >>>> diff --git
> > >>>> a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> > >>>> b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> > >>>> index aada6957216c..86703e995e31 100644
> > >>>> --- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> > >>>> +++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
> > >>>> @@ -35,6 +35,7 @@ properties:
> > >>>>            - const: sifive,clint0
> > >>>>        - items:
> > >>>>            - enum:
> > >>>> +              - thead,openc906-clint
> > >>>>                - allwinner,sun20i-d1-clint
> > >>>
> > >>> Add entries sorted alphabetically. This should be squashed with
> > >>> previous
> > >>> patch.
> > >> 
> > >> I make it a seperated patch because I think it's a questionable
> > >> approach.
> > >> 
> > >> If you think it's okay, I will just squash it and put it as the second
> > >> patch in the next iteration, with adding openc906-plic as the first
> > >> one.
> > >
> > >What is a questionable approach? Why commit msg is not saying this?
> > 
> > Ah I mentioned it in the cover letter. The problem is just I doubt whether
> > binding strings for single SoCs are necessary.
> 
> They are.
> 
> Unless all the quirks/bugs/features are somehow guaranteed to be exactly 
> the same as other SoCs sharing the same compatible string, or there is 
> another mechanism to identify the exact version (e.g. a version 
> register).

Icenowy,

Having thought about this a little - are we not *more* likely to see
bug/quirk disparity between implementations of the OpenC906 stuff by
the very nature of being an open-source IP?

Thanks,
Conor.
Icenowy Zheng Dec. 2, 2022, 6:12 a.m. UTC | #3
在 2022-12-01星期四的 19:18 +0000,Conor Dooley写道:
> On Wed, Nov 30, 2022 at 12:13:30PM -0600, Rob Herring wrote:
> > On Tue, Nov 22, 2022 at 03:41:27PM +0800, Icenowy Zheng wrote:
> > > 
> > > 
> > > 于 2022年11月22日 GMT+08:00 下午3:35:48, Krzysztof Kozlowski
> > > <krzysztof.kozlowski@linaro.org> 写到:
> > > > On 22/11/2022 08:18, Icenowy Zheng wrote:
> > > > > 在 2022-11-21星期一的 11:06 +0100,Krzysztof Kozlowski写道:
> > > > > > On 21/11/2022 05:17, Icenowy Zheng wrote:
> > > > > > > T-Head OpenC906 is a open-source-licensed fixed-
> > > > > > > configuration of
> > > > > > > C906,
> > > > > > > which is now public and able to be integrated.
> > > > > > > 
> > > > > > > Add a compatible for the CLINT shipped as part of
> > > > > > > OpenC906, which
> > > > > > > should
> > > > > > > just be ordinary C9xx CLINT.
> > > > > > > 
> > > > > > > Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
> > > > > > > ---
> > > > > > >  Documentation/devicetree/bindings/timer/sifive,clint.yam
> > > > > > > l | 1 +
> > > > > > >  1 file changed, 1 insertion(+)
> > > > > > > 
> > > > > > > diff --git
> > > > > > > a/Documentation/devicetree/bindings/timer/sifive,clint.ya
> > > > > > > ml
> > > > > > > b/Documentation/devicetree/bindings/timer/sifive,clint.ya
> > > > > > > ml
> > > > > > > index aada6957216c..86703e995e31 100644
> > > > > > > ---
> > > > > > > a/Documentation/devicetree/bindings/timer/sifive,clint.ya
> > > > > > > ml
> > > > > > > +++
> > > > > > > b/Documentation/devicetree/bindings/timer/sifive,clint.ya
> > > > > > > ml
> > > > > > > @@ -35,6 +35,7 @@ properties:
> > > > > > >            - const: sifive,clint0
> > > > > > >        - items:
> > > > > > >            - enum:
> > > > > > > +              - thead,openc906-clint
> > > > > > >                - allwinner,sun20i-d1-clint
> > > > > > 
> > > > > > Add entries sorted alphabetically. This should be squashed
> > > > > > with
> > > > > > previous
> > > > > > patch.
> > > > > 
> > > > > I make it a seperated patch because I think it's a
> > > > > questionable
> > > > > approach.
> > > > > 
> > > > > If you think it's okay, I will just squash it and put it as
> > > > > the second
> > > > > patch in the next iteration, with adding openc906-plic as the
> > > > > first
> > > > > one.
> > > > 
> > > > What is a questionable approach? Why commit msg is not saying
> > > > this?
> > > 
> > > Ah I mentioned it in the cover letter. The problem is just I
> > > doubt whether
> > > binding strings for single SoCs are necessary.
> > 
> > They are.
> > 
> > Unless all the quirks/bugs/features are somehow guaranteed to be
> > exactly 
> > the same as other SoCs sharing the same compatible string, or there
> > is 
> > another mechanism to identify the exact version (e.g. a version 
> > register).
> 
> Icenowy,
> 
> Having thought about this a little - are we not *more* likely to see
> bug/quirk disparity between implementations of the OpenC906 stuff by
> the very nature of being an open-source IP?

It's an open-source edition of a specific version of the commercial IP,
a fixed configuration.

In addition, maybe we can just retrieve the version infomation via a T-
Head custom CPU configuration register, mcpuid. Despite the
implementation of this register is weird -- it contains 7 different
read-only values, with the most significant nibble behaving as an
index.

> 
> Thanks,
> Conor.
>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/timer/sifive,clint.yaml b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
index aada6957216c..86703e995e31 100644
--- a/Documentation/devicetree/bindings/timer/sifive,clint.yaml
+++ b/Documentation/devicetree/bindings/timer/sifive,clint.yaml
@@ -35,6 +35,7 @@  properties:
           - const: sifive,clint0
       - items:
           - enum:
+              - thead,openc906-clint
               - allwinner,sun20i-d1-clint
           - const: thead,c900-clint
       - items: