linux-kernel - Re: [PATCH v2 01/16] dt-bindings: update the Allwinner GPADC device tree binding for H3 & A83T

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Date:   Mon, 29 Jan 2018 13:30:20 +0100
From:   Philipp Rossak <embed3d@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        wens@...e.org, linux@...linux.org.uk, jic23@...nel.org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        davem@...emloft.net, hans.verkuil@...co.com, mchehab@...nel.org,
        rask@...melder.dk, clabbe.montjoie@...il.com, sean@...s.org,
        krzk@...nel.org, quentin.schulz@...e-electrons.com,
        icenowy@...c.io, edu.molinas@...il.com, singhalsimran0@...il.com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 01/16] dt-bindings: update the Allwinner GPADC device
 tree binding for H3 & A83T

>> +Example for A33:
>>   	ths: ths@...5000 {
>>   		compatible = "allwinner,sun8i-a33-ths";
>>   		reg = <0x01c25000 0x100>;
>> @@ -17,6 +40,27 @@ Example:
>>   		#io-channel-cells = <0>;
>>   	};
>>   
>> +Example for H3:
>> +	ths: thermal-sensor@...5000 {
>> +		compatible = "allwinner,sun8i-h3-ths";
>> +		reg = <0x01c25000 0x400>;
>> +		clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
>> +		clock-names = "bus", "mod";
>> +		resets = <&ccu RST_BUS_THS>;
>> +		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
>> +		#thermal-sensor-cells = <0>;
>> +		#io-channel-cells = <0>;
>> +	};
>> +
>> +Example for A83T:
>> +	ths: thermal-sensor@...4000 {
>> +		compatible = "allwinner,sun8i-a83t-ths";
>> +		reg = <0x01f04000 0x100>;
>> +		interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
>> +		#thermal-sensor-cells = <1>;
>> +		#io-channel-cells = <0>;
>> +	};
>> +
> 
> I'm wondering if this is actually needed. We've used this convoluted
> constructs to be compatible with the old driver, but I'm not sure this
> is actually worth it now, and this is causing several issues, among
> which:
>    - We need to have a bunch of quirks to handle all the DT cases.
>    - We need to have an MFD, which isn't really optimal
> 
> So I'd rather introduce a new compatible for the old SoCs, keep the
> old driver around, and simplify a lot that driver code that will ease
> further developments. And we can also get rid of the MFD in the
> process. I discussed it with Quentin, and he was ok with it, what do
> you think?
> 
> (and that would involve creating a new file for the bindings you
> introduce here).
> 
> Maxime
> 

I think this is a good idea, and the desired way to rework the driver.

To sum up what we talked on IRC:

This will end up in removing the MFD driver and moving the interrupt 
handling into the iio driver. At the end this will also simplify the IRQ 
part.

Philipp