linux-kernel - Re: [v6 2/4] dt-bindings: hwmon: Add ASPEED TACH Control documentation

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Date:   Mon, 17 Jul 2023 23:45:36 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        蔡承達 <billyking19920205@...il.com>
Cc:     "jdelvare@...e.com" <jdelvare@...e.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "corbet@....net" <corbet@....net>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patrick@...cx.xyz" <patrick@...cx.xyz>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [v6 2/4] dt-bindings: hwmon: Add ASPEED TACH Control
 documentation

On 7/17/23 23:04, Krzysztof Kozlowski wrote:

[ ... ]

>> The first method involves passing the memory region from an MFD
>> driver, which was the
> 
> I have no clue how can you pass memory region
> (Documentation/devicetree/bindings/reserved-memory/) from MFD and why
> does it make sense here.
> 

It is quite common for mfd drivers to pass regmap information to
child drivers. Child drivers typically call dev_get_regmap() with
the parent device as parameter. Granted, that is typically used
for spi or i2c devices, but I don't see why it would not work
here as well.

Then there s syscon, but I don't know if that works with overlapping
memory regions.

Guenter