linux-kernel - Re: [PATCH v2 4/4] dt-bindings/watchdog: Add access

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Date:   Mon, 26 Aug 2019 17:08:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andrew Jeffery <andrew@...id.au>,
        Ivan Mikhaylov <i.mikhaylov@...ro.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     Joel Stanley <joel@....id.au>, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Alexander Amelkin <a.amelkin@...ro.com>,
        openbmc@...ts.ozlabs.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/4] dt-bindings/watchdog: Add access_cs0 option for
 alt-boot

On 8/26/19 4:57 PM, Andrew Jeffery wrote:
> 
> 
> On Mon, 26 Aug 2019, at 20:17, Ivan Mikhaylov wrote:
>> The option for the ast2400/2500 to get access to CS0 at runtime.
>>
>> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
>> ---
>>   Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> index c5077a1f5cb3..023a9b578df6 100644
>> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> @@ -34,6 +34,13 @@ Optional properties:
>>                   engine is responsible for this.
>>   
>>    - aspeed,alt-boot:    If property is present then boot from alternate
>> block.
>> +                       At alternate side 'access_cs0' sysfs file
>> provides:
> 
> Why are we talking about sysfs in the devicetree binding? This patch
> doesn't seem right to me.
> 

Correct; this is the wrong document. The attribute also will need
to be better explained. "At alternate side" does not explain (at
least not at all clearly enough) that the attribute only exists
if the system has booted from the alternate flash / block.

> Also if we're not supporting the aspeed,alt-boot property we should
> probably document it as deprecated rather than making it disappear,
> unless you're going to fix the systems that are using it.
> 
Sorry, you lost me here. Where is it made to disappear ?

Guenter