linux-kernel - Re: [PATCH v6 0/3] watchdog: mt7621-wdt: avoid globals and arch dependencies

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Date:   Tue, 14 Feb 2023 11:31:37 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>,
        linux-watchdog@...r.kernel.org
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        tsbogend@...ha.franken.de, p.zabel@...gutronix.de,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v6 0/3] watchdog: mt7621-wdt: avoid globals and arch
 dependencies

On 14.02.2023 11:12, Arınç ÜNAL wrote:
> On 13.02.2023 23:05, Sergio Paracuellos wrote:
>> Hi all,
>>
>> This series make an update in the MT7621 SoC's watchdog driver code. This
>> SoC already provides a system controller node to access reset status
>> register needed for the watchdog. Instead of using MIPS architecture
>> dependent operations in header 'asm/mach-ralink/ralink_regs.h' get
>> node syscon regmap using 'syscon_regmap_lookup_by_compatible()' and use.
>> regmap APIS. Driver is also using some globals that are not needed at
>> all if a driver data structure is used along the code. Hence, add all
>> new needed stuff inside a new driver data structure. With this changes
>> driver can be properly compile tested.
>>
>> Thanks in advance for reviewing this!
>>
>> v1 of this series here [0].
>> v2 of this series here [1].
>> v3 of this series here [2].
>> v4 of this series here [3].
>> v5 of this series here [4].
>>
>> Changes in v6:
>>      - Get regmap syscon using 'syscon_regmap_lookup_by_compatible()'
>>      - Add COMPILE_TEST and dependencies to Kconfig.
>>      - Collect Philippe Mathieu-Daudé 'Reviewed-by' tag for watchdog node
>>        warning fix.
>>
>> Changes in v5:
>>      - Drop patches related with device tree ABI breakage and only
>>        maintain the rest.
> 
> This makes me regret taking mt7621-dts out of drivers/staging. Clearly 
> there were improvements to be made on the MT7621 drivers that would 
> affect the devicetree binding. I don't think one would bat an eye to 
> make dt-binding changes on a devicetree on drivers/staging.
> 
> I also want to make a similar change that would break the ABI. I want to 
> split the MediaTek MIPS (currently called Ralink) pinctrl subdrivers 
> further, namely mt7620.c, to split MT7628/MT7688 pinmux data from 
> MT7620, so I can properly document which function can be given to which 
> group(s) for the MT7628/MT7688 SoCs.
> 
> This means I've got to introduce a new compatible string for the MT76X8 
> SoCs which would cause the pinctrl driver to stop working with an old DT 
> for the MT76X8 SoCs. By the nature of the change, I can't make a way 
> around with the code like Sergio did in v6.

Now that I think about it, I think there's a way I can introduce a new 
compatible string for the sake of better documentation, and keep the 
driver working with old DTs. I'd not like to convolute this series with 
this conversation. I'll send a mail to the related mailing list when the 
time is right.

Arınç