linux-kernel - Re: [PATCH v2 6/6] of: of_cpu_phandle_to

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Message-ID: <20250506112337.00006918.alireza.sanaee@huawei.com>
Date: Tue, 6 May 2025 11:23:37 +0100
From: Alireza Sanaee <alireza.sanaee@...wei.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: <devicetree@...r.kernel.org>, <robh@...nel.org>,
	<jonathan.cameron@...wei.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<mark.rutland@....com>, <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH v2 6/6] of: of_cpu_phandle_to_id to support SMT threads

On Sun, 4 May 2025 19:52:34 +0200
Krzysztof Kozlowski <krzk@...nel.org> wrote:

> On 04/05/2025 19:51, Krzysztof Kozlowski wrote:
> >> In the CPU map, there are two cases that only one occurs at at
> >> time. 1) "cpu" = <phandle>
> >>     2) "cpus" = <phandle> <index>
> >>
> >> The first case addresses non-SMTs and the second case addresses
> >> SMTs that the variable must be cpu(s) with an index where we later
> >> look up the reg array with that.
> >>
> >>     core0 {
> >>       thread0 {
> >>         cpus = <&cpu0 0>;  
> > 
> > Not so sure, dtschema says only one item is allowed in the phandle
> > and I do not see here binding change.
> > 
> > Although this wasn't even sent to me, so I'll just ignore your
> > patchset.  
> 
> Ah, there was no binding in the patchset, so that's why I did not get
> it. Makes sense now, but question about missing binding change stays.
> 
> Best regards,
> Krzysztof
> 

Hi Krzysztof,

There are some existing bindings in which this pattern has been
used, so I don't think I am changing binding really.

https://www.kernel.org/doc/Documentation/devicetree/bindings/thermal/thermal-zones.yaml#:~:text=cooling%2Ddevice%20%3D%20%3C%26CPU0%203%203%3E%2C%20%3C%26CPU1%203%203%3E%2C

Would that be good, if I just include the link in the next version?

Thanks,
Alireza