linux-kernel - Re: [PATCH 3/7] watchdog: s3c2410: Make reset disable optional

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Message-ID: <2a5ff8d0-c665-e25e-cb40-51326db2e26a@canonical.com>
Date:   Fri, 29 Oct 2021 10:04:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Sam Protsenko <semen.protsenko@...aro.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 3/7] watchdog: s3c2410: Make reset disable optional

On 29/10/2021 02:16, Guenter Roeck wrote:
> On 10/28/21 11:35 AM, Sam Protsenko wrote:
>> Not all SoCs have AUTOMATIC_WDT_RESET_DISABLE register, examples are
>> Exynos850 and Exynos9. On such chips reset disable register shouldn't be
>> accessed. Provide a way to avoid handling that register. This is done by
>> introducing separate callbacks to driver data structure: one for reset
>> disable register, and one for mask reset register. Now those callbacks
>> can be checked and called only when those were set in driver data.
>>
>> This commit doesn't bring any functional change to existing devices, but
>> merely provides an infrastructure for upcoming chips support.
>>
> 
> That doesn't explain why the callbacks are needed instead of additional
> feature flags.
> 

Or why not skipping the disable operations if disable_reg is not provided?


Best regards,
Krzysztof