To use the SCU register to obtain reset flags for supporting
bootstatus.

Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
---
 Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
index 3208adb3e52e..80a1f58b5a2e 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -8,6 +8,8 @@ Required properties:
 
  - reg: physical base address of the controller and length of memory mapped
    region
+ - aspeed,scu: a reference to the System Control Unit node of the Aspeed
+   SOC.
 
 Optional properties:
 
@@ -62,6 +64,7 @@ Examples:
 		reg = <0x1e785000 0x1c>;
 		aspeed,reset-type = "system";
 		aspeed,external-signal;
+		aspeed,scu = <&syscon>;
 	};
 
 	#include <dt-bindings/watchdog/aspeed-wdt.h>
@@ -70,4 +73,5 @@ Examples:
 		reg = <0x1e785040 0x40>;
 		aspeed,reset-mask = <AST2600_WDT_RESET1_DEFAULT
 				     (AST2600_WDT_RESET2_DEFAULT & ~AST2600_WDT_RESET2_LPC)>;
+		aspeed,scu = <&syscon>;
 	};
-- 
2.25.1

On Thu, Mar 28, 2024 at 10:22:30AM +0800, Peter Yin wrote:
> To use the SCU register to obtain reset flags for supporting
> bootstatus.
> 
> Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
> ---
>  Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> index 3208adb3e52e..80a1f58b5a2e 100644
> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> @@ -8,6 +8,8 @@ Required properties:
>  
>   - reg: physical base address of the controller and length of memory mapped
>     region
> + - aspeed,scu: a reference to the System Control Unit node of the Aspeed
> +   SOC.

You cannot add new required properties as that is an ABI break.

If there's only 1 SCU instance, you can just fetch its node by 
compatible with no DT change.

What's the plan for converting this binding to schema? This is the 2nd 
new property in 6 months.

Rob

On Mon, 2024-04-01 at 08:56 -0500, Rob Herring wrote:
> On Thu, Mar 28, 2024 at 10:22:30AM +0800, Peter Yin wrote:
> > To use the SCU register to obtain reset flags for supporting
> > bootstatus.
> > 
> > Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
> > ---
> >  Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> > index 3208adb3e52e..80a1f58b5a2e 100644
> > --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> > +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> > @@ -8,6 +8,8 @@ Required properties:
> >  
> >   - reg: physical base address of the controller and length of memory mapped
> >     region
> > + - aspeed,scu: a reference to the System Control Unit node of the Aspeed
> > +   SOC.
> 
> You cannot add new required properties as that is an ABI break.
> 
> If there's only 1 SCU instance, you can just fetch its node by 
> compatible with no DT change.
> 
> What's the plan for converting this binding to schema? This is the 2nd 
> new property in 6 months.

I had a patch converting it in a local branch which I've now sent:

https://lore.kernel.org/all/20240402120118.282035-1-andrew@codeconstruct.com.au/

Perhaps we can pull it into this series?

Andrew

Thanks, I can wait you update it and send a new version for wdt driver.

Andrew Jeffery 於 4/2/24 20:09 寫道:
> I had a patch converting it in a local branch which I've now sent:
> 
> https://lore.kernel.org/all/20240402120118.282035-1-andrew@codeconstruct.com.au/
> 
> Perhaps we can pull it into this series?

On Wed, 2024-04-03 at 17:18 +0800, PeterYin wrote:
> Thanks, I can wait you update it and send a new version for wdt driver.

I've sent v2:


https://lore.kernel.org/linux-watchdog/20240403020439.418788-1-andrew@codeconstruct.com.au/

Rob's okay with it:

https://lore.kernel.org/linux-watchdog/20240403171321.GA3996007-robh@kernel.org/

Feel free to address his comment there if you integrate it into your
series, though make sure to add his tag, keep my authorship, and append
your own S-o-b if you do.

Andrew