diff mbox series

[v2,4/8] dt-bindings: sifive,ccache0: Support StarFive JH7110 SoC

Message ID 20221118011714.70877-5-hal.feng@starfivetech.com
State New
Headers show
Series Basic device tree support for StarFive JH7110 RISC-V SoC | expand

Commit Message

Hal Feng Nov. 18, 2022, 1:17 a.m. UTC 
From: Emil Renner Berthing <kernel@esmil.dk>

This cache controller is also used on the StarFive JH7110 SoC.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
---
 .../devicetree/bindings/riscv/sifive,ccache0.yaml          | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Comments

Hal Feng Nov. 22, 2022, 8:40 a.m. UTC | #1 
On Fri, 18 Nov 2022 19:39:52 +0800, Conor Dooley wrote:
> On Fri, Nov 18, 2022 at 11:37:50AM +0000, Conor Dooley wrote:
> > On Fri, Nov 18, 2022 at 09:17:10AM +0800, Hal Feng wrote:
> > > From: Emil Renner Berthing <kernel@esmil.dk>
> > > 
> > > This cache controller is also used on the StarFive JH7110 SoC.
> > 
> > "... and configured identically to that of the FU740"?
> > Anyways,
> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> 
> Actually, after looking at the next patch - why can you not fall back to
> the fu740 one since you appear to have the same configuration as it?

Right, I will drop this patch and use "sifive,fu740-c000-ccache" as
compatible in dts.

Best regards,
Hal
Ben Dooks Nov. 22, 2022, 9:09 a.m. UTC | #2 
On 22/11/2022 09:07, Conor Dooley wrote:
> On Tue, Nov 22, 2022 at 04:40:23PM +0800, Hal Feng wrote:
>> On Fri, 18 Nov 2022 19:39:52 +0800, Conor Dooley wrote:
>>> On Fri, Nov 18, 2022 at 11:37:50AM +0000, Conor Dooley wrote:
>>>> On Fri, Nov 18, 2022 at 09:17:10AM +0800, Hal Feng wrote:
>>>>> From: Emil Renner Berthing <kernel@esmil.dk>
>>>>>
>>>>> This cache controller is also used on the StarFive JH7110 SoC.
>>>>
>>>> "... and configured identically to that of the FU740"?
>>>> Anyways,
>>>> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
>>>
>>> Actually, after looking at the next patch - why can you not fall back to
>>> the fu740 one since you appear to have the same configuration as it?
>>
>> Right, I will drop this patch and use "sifive,fu740-c000-ccache" as
>> compatible in dts.
> 
> Uh, that's not quite what I was suggesting. Rather than using that one
> in isolation, you can do the following in your dt:
> "starfive,jh7110-ccache", "sifive,fu740-c000-ccache"
> 
> And then in the driver we need to make no changes - unless down the line
> we find some sort of issue that requires special handling etc. There's
> no harm in having a "starfive,jh7110-ccache" IMO.

Yeah, sifive,ccache0 is probably the generic one which would get
this working.
Emil Renner Berthing Nov. 22, 2022, 10:35 a.m. UTC | #3 
On Tue, 22 Nov 2022 at 11:16, Hal Feng <hal.feng@starfivetech.com> wrote:
>
> On Tue, 22 Nov 2022 10:01:30 +0000, Conor Dooley wrote:
> > On Tue, Nov 22, 2022 at 05:55:57PM +0800, Hal Feng wrote:
> > > On Tue, 22 Nov 2022 09:07:26 +0000, Conor Dooley wrote:
> > > > On Tue, Nov 22, 2022 at 04:40:23PM +0800, Hal Feng wrote:
> > > > > On Fri, 18 Nov 2022 19:39:52 +0800, Conor Dooley wrote:
> > > > > > On Fri, Nov 18, 2022 at 11:37:50AM +0000, Conor Dooley wrote:
> > > > > > > On Fri, Nov 18, 2022 at 09:17:10AM +0800, Hal Feng wrote:
> > > > > > > > From: Emil Renner Berthing <kernel@esmil.dk>
> > > > > > > >
> > > > > > > > This cache controller is also used on the StarFive JH7110 SoC.
> > > > > > >
> > > > > > > "... and configured identically to that of the FU740"?
> > > > > > > Anyways,
> > > > > > > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > > > > >
> > > > > > Actually, after looking at the next patch - why can you not fall back to
> > > > > > the fu740 one since you appear to have the same configuration as it?
> > > > >
> > > > > Right, I will drop this patch and use "sifive,fu740-c000-ccache" as
> > > > > compatible in dts.
> > > >
> > > > Uh, that's not quite what I was suggesting. Rather than using that one
> > > > in isolation, you can do the following in your dt:
> > > > "starfive,jh7110-ccache", "sifive,fu740-c000-ccache"
> > > >
> > > > And then in the driver we need to make no changes - unless down the line
> > > > we find some sort of issue that requires special handling etc. There's
> > > > no harm in having a "starfive,jh7110-ccache" IMO.
> > >
> > > Just like what microchip did as blow?
>
> below
>
> > >
> > > Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml:
> > > properties:
> > >   compatible:
> > >     oneOf:
> > >       - items:
> > >           - enum:
> > >               - sifive,ccache0
> > >               - sifive,fu540-c000-ccache
> > >               - sifive,fu740-c000-ccache
> > >               - starfive,jh7110-ccache
> > >           - const: cache
> > >       - items:
> > >           - const: microchip,mpfs-ccache
> > >           - const: sifive,fu540-c000-ccache
> > >           - const: cache
> >
> > No, I don't think this is correct either. You'd do something like:
> >
> > >       - items:
> > >           - const: starfive,jh7110-ccache
> > >           - const: sifive,fu740-c000-ccache

For the record I don't think the line above should be there. The
fu7400-c000 is a specific tapeout and pretending the JH7110 is that
tapeout is not right. Especially when there is already the
"sifive,ccache0" string for the generic IP.

> > >           - const: cache
>
> Yeah, this is what I mean. Thanks.
>
> Best regards,
> Hal
>
> >
> > And then the driver needs no changes.
>
Hal Feng Nov. 22, 2022, 12:51 p.m. UTC | #4 
On Tue, 22 Nov 2022 11:35:28 +0100, Emil Renner Berthing wrote:
> On Tue, 22 Nov 2022 at 11:16, Hal Feng <hal.feng@starfivetech.com> wrote:
> >
> > On Tue, 22 Nov 2022 10:01:30 +0000, Conor Dooley wrote:
> > > On Tue, Nov 22, 2022 at 05:55:57PM +0800, Hal Feng wrote:
> > > > On Tue, 22 Nov 2022 09:07:26 +0000, Conor Dooley wrote:
> > > > > On Tue, Nov 22, 2022 at 04:40:23PM +0800, Hal Feng wrote:
> > > > > > On Fri, 18 Nov 2022 19:39:52 +0800, Conor Dooley wrote:
> > > > > > > On Fri, Nov 18, 2022 at 11:37:50AM +0000, Conor Dooley wrote:
> > > > > > > > On Fri, Nov 18, 2022 at 09:17:10AM +0800, Hal Feng wrote:
> > > > > > > > > From: Emil Renner Berthing <kernel@esmil.dk>
> > > > > > > > >
> > > > > > > > > This cache controller is also used on the StarFive JH7110 SoC.
> > > > > > > >
> > > > > > > > "... and configured identically to that of the FU740"?
> > > > > > > > Anyways,
> > > > > > > > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > > > > > >
> > > > > > > Actually, after looking at the next patch - why can you not fall back to
> > > > > > > the fu740 one since you appear to have the same configuration as it?
> > > > > >
> > > > > > Right, I will drop this patch and use "sifive,fu740-c000-ccache" as
> > > > > > compatible in dts.
> > > > >
> > > > > Uh, that's not quite what I was suggesting. Rather than using that one
> > > > > in isolation, you can do the following in your dt:
> > > > > "starfive,jh7110-ccache", "sifive,fu740-c000-ccache"
> > > > >
> > > > > And then in the driver we need to make no changes - unless down the line
> > > > > we find some sort of issue that requires special handling etc. There's
> > > > > no harm in having a "starfive,jh7110-ccache" IMO.
> > > >
> > > > Just like what microchip did as blow?
> >
> > below
> >
> > > >
> > > > Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml:
> > > > properties:
> > > >   compatible:
> > > >     oneOf:
> > > >       - items:
> > > >           - enum:
> > > >               - sifive,ccache0
> > > >               - sifive,fu540-c000-ccache
> > > >               - sifive,fu740-c000-ccache
> > > >               - starfive,jh7110-ccache
> > > >           - const: cache
> > > >       - items:
> > > >           - const: microchip,mpfs-ccache
> > > >           - const: sifive,fu540-c000-ccache
> > > >           - const: cache
> > >
> > > No, I don't think this is correct either. You'd do something like:
> > >
> > > >       - items:
> > > >           - const: starfive,jh7110-ccache
> > > >           - const: sifive,fu740-c000-ccache
> 
> For the record I don't think the line above should be there. The
> fu7400-c000 is a specific tapeout and pretending the JH7110 is that
> tapeout is not right. Especially when there is already the
> "sifive,ccache0" string for the generic IP.

I will change this line to

- const: sifive,ccache0

Thanks for your suggestion.

> 
> > > >           - const: cache
> >
> > Yeah, this is what I mean. Thanks.
> >
> > Best regards,
> > Hal
> >
> > >
> > > And then the driver needs no changes.
> >
Rob Herring Nov. 23, 2022, 10:26 p.m. UTC | #5 
On Tue, Nov 22, 2022 at 11:35:28AM +0100, Emil Renner Berthing wrote:
> On Tue, 22 Nov 2022 at 11:16, Hal Feng <hal.feng@starfivetech.com> wrote:
> >
> > On Tue, 22 Nov 2022 10:01:30 +0000, Conor Dooley wrote:
> > > On Tue, Nov 22, 2022 at 05:55:57PM +0800, Hal Feng wrote:
> > > > On Tue, 22 Nov 2022 09:07:26 +0000, Conor Dooley wrote:
> > > > > On Tue, Nov 22, 2022 at 04:40:23PM +0800, Hal Feng wrote:
> > > > > > On Fri, 18 Nov 2022 19:39:52 +0800, Conor Dooley wrote:
> > > > > > > On Fri, Nov 18, 2022 at 11:37:50AM +0000, Conor Dooley wrote:
> > > > > > > > On Fri, Nov 18, 2022 at 09:17:10AM +0800, Hal Feng wrote:
> > > > > > > > > From: Emil Renner Berthing <kernel@esmil.dk>
> > > > > > > > >
> > > > > > > > > This cache controller is also used on the StarFive JH7110 SoC.
> > > > > > > >
> > > > > > > > "... and configured identically to that of the FU740"?
> > > > > > > > Anyways,
> > > > > > > > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > > > > > >
> > > > > > > Actually, after looking at the next patch - why can you not fall back to
> > > > > > > the fu740 one since you appear to have the same configuration as it?
> > > > > >
> > > > > > Right, I will drop this patch and use "sifive,fu740-c000-ccache" as
> > > > > > compatible in dts.
> > > > >
> > > > > Uh, that's not quite what I was suggesting. Rather than using that one
> > > > > in isolation, you can do the following in your dt:
> > > > > "starfive,jh7110-ccache", "sifive,fu740-c000-ccache"
> > > > >
> > > > > And then in the driver we need to make no changes - unless down the line
> > > > > we find some sort of issue that requires special handling etc. There's
> > > > > no harm in having a "starfive,jh7110-ccache" IMO.
> > > >
> > > > Just like what microchip did as blow?
> >
> > below
> >
> > > >
> > > > Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml:
> > > > properties:
> > > >   compatible:
> > > >     oneOf:
> > > >       - items:
> > > >           - enum:
> > > >               - sifive,ccache0
> > > >               - sifive,fu540-c000-ccache
> > > >               - sifive,fu740-c000-ccache
> > > >               - starfive,jh7110-ccache
> > > >           - const: cache
> > > >       - items:
> > > >           - const: microchip,mpfs-ccache
> > > >           - const: sifive,fu540-c000-ccache
> > > >           - const: cache
> > >
> > > No, I don't think this is correct either. You'd do something like:
> > >
> > > >       - items:
> > > >           - const: starfive,jh7110-ccache
> > > >           - const: sifive,fu740-c000-ccache
> 
> For the record I don't think the line above should be there. The
> fu7400-c000 is a specific tapeout and pretending the JH7110 is that
> tapeout is not right. Especially when there is already the
> "sifive,ccache0" string for the generic IP.

All it really says is that this h/w will work with any client (OS) 
that understands 'sifive,fu740-c000-ccache'. Maybe 'sifive,ccache0' is 
sufficient too, IDK.

Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml b/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
index bf3f07421f7e..262d1d49ce25 100644
--- a/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
+++ b/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
@@ -25,6 +25,7 @@  select:
           - sifive,ccache0
           - sifive,fu540-c000-ccache
           - sifive,fu740-c000-ccache
+          - starfive,jh7110-ccache
 
   required:
     - compatible
@@ -37,6 +38,7 @@  properties:
               - sifive,ccache0
               - sifive,fu540-c000-ccache
               - sifive,fu740-c000-ccache
+              - starfive,jh7110-ccache
           - const: cache
       - items:
           - const: microchip,mpfs-ccache
@@ -86,6 +88,7 @@  allOf:
             enum:
               - sifive,fu740-c000-ccache
               - microchip,mpfs-ccache
+              - starfive,jh7110-ccache
 
     then:
       properties:
@@ -105,7 +108,9 @@  allOf:
       properties:
         compatible:
           contains:
-            const: sifive,fu740-c000-ccache
+            enum:
+              - sifive,fu740-c000-ccache
+              - starfive,jh7110-ccache
 
     then:
       properties: