linux-kernel - Re: [PATCH v4 0/9] Add Mule MFD support

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Date: Fri, 28 Jun 2024 08:05:17 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Farouk Bouabid <farouk.bouabid@...rry.de>,
 Quentin Schulz <quentin.schulz@...rry.de>, Jean Delvare <jdelvare@...e.com>,
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
 Peter Rosin <peda@...ntia.se>, Heiko Stuebner <heiko@...ech.de>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 0/9] Add Mule MFD support

On 6/28/24 02:03, Farouk Bouabid wrote:
> Hi Guenter,
> 
> On 28.06.24 02:05, Guenter Roeck wrote:
>> On 6/24/24 09:13, Farouk Bouabid wrote:
>>> Hi Guenter,
>>>
>>> On 19.06.24 15:31, Guenter Roeck wrote:
>>>> On 6/19/24 00:45, Farouk Bouabid wrote:
> 
> 
> [...]
> 
> 
>>
>>> If we cannot proceed with that then we could add a compatible to the amc6821 driver to add the mux device (Basically the "tsd,mule" compatible in amc6821 compatible list would be a combo driver with mux logic + amc6821). Do you think that is more appropriate ?
>>>
>>
>> Implement the mux as part of the amc6821 driver ? No. We could discuss
>> instantiating the i2c mux driver from the amc6821 driver.
> 
> 
> If I understand correctly we would have the amc6821 for "tsd,mule" compatible probe the mule-i2c-mux as platform_device. Possible DT representation would be something like:
> 

Yes, something like that. I have a patch series ready which converts the amc6821
to use regmap, so the i2c-mux driver might work as-is with that patch series in place.

Thanks,
Guenter