linux-kernel - Re: [PATCH] arm64: dts: exynos: gs101: add stable i2c aliases for gs101-oriole

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Date: Mon, 12 Feb 2024 12:38:14 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 peter.griffin@...aro.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org,  conor+dt@...nel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
 tudor.ambarus@...aro.org, willmcvicker@...gle.com,
 semen.protsenko@...aro.org,  alim.akhtar@...sung.com,
 linux-arm-kernel@...ts.infradead.org,  linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: exynos: gs101: add stable i2c aliases for
 gs101-oriole

On Mon, 2024-02-12 at 13:07 +0100, Krzysztof Kozlowski wrote:
> On 12/02/2024 12:52, André Draszik wrote:
> > As I said above, we won't care if downstream changes again at that stage, so
> > no, I wouldn't plan on changing again.
> 
> Then I am lost. What stage are you thinking? What differs between now
> and let's say 1 month for the GS101 which was released more than three
> years ago?

The idea was to make the initial transition to using upstream easier,
hence we added the same aliases as downstream (at the time).
Given the transition is not happening right now, we might as well hold
off with the aliases and add them later, with whatever downstream will
be using at that time.

If in the future somebody downstream decides 'I want this' (changed again),
why should upstream care at that stage?

Again, this patch was just trying to make initial transition easier, do you
have a better recommendation?

> BTW, the aliases I see in downstream DTS (gs101-usi.dtsi) - since
> beginning up to Android 14 are:
> 
>                 hsi2c8 = &hsi2c_8;
>                 hsi2c9 = &hsi2c_9;
>                 hsi2c10 = &hsi2c_10;
>                 hsi2c11 = &hsi2c_11;
>                 hsi2c12 = &hsi2c_12;
> 
> They were set like this in 2020 and never changed afterwards.

Those were incorrect and didn't actually work as intended, here's a
better place to look:

https://android.googlesource.com/kernel/google-modules/raviole-device/+log/refs/heads/android-gs-raviole-mainline
and
https://android.googlesource.com/kernel/google-modules/raviole-device/+/9864593c894da90cd8b631ab57f15c25f4e11465%5E%21/


Cheers,
Andre'