RE: [PATCH v6 2/5] dt-bindings: clock: Add AST2500/AST2600 HACE reset definition

[Neal Liu]

> -----Original Message-----
> From: Dhananjay Phadke <dphadke@xxxxxxxxxxxxxxxxxxx>
> Sent: Wednesday, June 29, 2022 7:50 PM
> To: Neal Liu <neal_liu@xxxxxxxxxxxxxx>; Corentin Labbe
> <clabbe.montjoie@xxxxxxxxx>; Christophe JAILLET
> <christophe.jaillet@xxxxxxxxxx>; Randy Dunlap <rdunlap@xxxxxxxxxxxxx>;
> Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>; David S . Miller
> <davem@xxxxxxxxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>; Joel Stanley <joel@xxxxxxxxx>;
> Andrew Jeffery <andrew@xxxxxxxx>; Dhananjay Phadke
> <dhphadke@xxxxxxxxxxxxx>; Johnny Huang
> <johnny_huang@xxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx; linux-aspeed@xxxxxxxxxxxxxxxx; BMC-SW
> <BMC-SW@xxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx;
> linux-crypto@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v6 2/5] dt-bindings: clock: Add AST2500/AST2600 HACE
> reset definition
> 
> On 6/29/2022 2:44 AM, Neal Liu wrote:
> > Add HACE reset bit definition for AST2500/AST2600.
> >
> > Signed-off-by: Neal Liu <neal_liu@xxxxxxxxxxxxxx>
> > Signed-off-by: Johnny Huang <johnny_huang@xxxxxxxxxxxxxx>
> > ---
> >   include/dt-bindings/clock/aspeed-clock.h  | 1 +
> >   include/dt-bindings/clock/ast2600-clock.h | 1 +
> >   2 files changed, 2 insertions(+)
> >
> > diff --git a/include/dt-bindings/clock/aspeed-clock.h
> > b/include/dt-bindings/clock/aspeed-clock.h
> > index 9ff4f6e4558c..06d568382c77 100644
> > --- a/include/dt-bindings/clock/aspeed-clock.h
> > +++ b/include/dt-bindings/clock/aspeed-clock.h
> > @@ -52,5 +52,6 @@
> >   #define ASPEED_RESET_I2C		7
> >   #define ASPEED_RESET_AHB		8
> >   #define ASPEED_RESET_CRT1		9
> > +#define ASPEED_RESET_HACE		10
> 
> NAK.
> 
> I replied to older v5 of this patch, but this v6 also looks incorrect as per HW
> manual.
> 
> https://lore.kernel.org/linux-arm-kernel/20220629032008.1579899-1-neal_liu
> @aspeedtech.com/T/#m000bd3388b3e41117aa0eef10bf6f8a6a3a85cce
> 
> For both AST2400 and AST2500:
> SCU04[10] = PECI.
> 
> It will be best to refactor/split aspeed-clock.h into separate files.

Hi, based on @Krzysztof mentioned, change these define is not allowed due to breaking ABI.
So another way is to define a new value(interface), and we can change driver's implementation.
I know this is not intuitive to hardware register's value, it also confused me at the first time.