linux-kernel - Re: [PATCH v6 2/2] dt-bindings: rtc: add max313xx RTCs

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Date: Tue, 6 Feb 2024 20:21:15 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	"alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "jdelvare@...e.com"
	<jdelvare@...e.com>, "linux@...ck-us.net" <linux@...ck-us.net>,
	"antoniu.miclaus@...log.com" <antoniu.miclaus@...log.com>,
	"noname.nuno@...il.com" <noname.nuno@...il.com>
CC: "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>, Ibrahim Tilki
	<Ibrahim.Tilki@...log.com>, Zeynep Arslanbenzer
	<Zeynep.Arslanbenzer@...log.com>
Subject: Re: [PATCH v6 2/2] dt-bindings: rtc: add max313xx RTCs

(resend as plain text, sorry for the noise)


On 2/02/24 21:28, Krzysztof Kozlowski wrote:
> On 02/02/2024 03:52, Chris Packham wrote:
>> From: Ibrahim Tilki<Ibrahim.Tilki@...log.com>
>>
>> Devicetree binding documentation for Analog Devices MAX313XX RTCs
>>
>> Signed-off-by: Ibrahim Tilki<Ibrahim.Tilki@...log.com>
>> Signed-off-by: Zeynep Arslanbenzer<Zeynep.Arslanbenzer@...log.com>
>> Signed-off-by: Chris Packham<chris.packham@...iedtelesis.co.nz>
>> ---
> ...
>
>> +  clocks:
>> +    description:
>> +      RTC uses this clock for clock input when supplied. Clock has to provide
>> +      one of these four frequencies - 1Hz, 50Hz, 60Hz or 32.768kHz.
>> +    maxItems: 1
>> +
>> +  adi,tc-diode:
>> +    description:
>> +      Select the diode configuration for the trickle charger.
>> +      schottky - Schottky diode in series.
>> +      standard+schottky - standard diode + Schottky diode in series.
>> +    enum: [schottky, standard+schottky]
>> +
>> +  trickle-resistor-ohms:
>> +    description: Selected resistor for trickle charger.
>> +    enum: [3000, 6000, 11000]
> Please remind us and document in commit msg, why this cannot be part of
> max31335 binding? Looks exactly the same.

That is an incredibly good point. The max31335 binding covers one 
specific chip. This binding covers more and with that there are a few 
more properties that the max31335 on it's own doesn't have (e.g. the 
clock consumer, the ability to have different i2c addresses). Binding 
wise I could probably roll all of the max31335 into this max313xx binding.

Driver wise things are a bit trickier. I've only got access to one of 
the variants so I am hoping to leverage the work Ibrahim had already 
done. I could attempt to incorporate max31335 support into the max313xx 
driver but I wouldn't really be able to test it properly and there is a 
reasonably high chance of regressing something.

>> +
>> +required:
>> +  - compatible
>> +  - reg
> Best regards,
> Krzysztof
>