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

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Date: Wed, 31 Jan 2024 12:40:24 -0800
From: William McVicker <willmcvicker@...gle.com>
To: André Draszik <andre.draszik@...aro.org>
Cc: peter.griffin@...aro.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	tudor.ambarus@...aro.org, 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

Hi Andre,

On 01/30/2024, André Draszik wrote:
> Now that we have more than i2c interface, add aliases to ensure
> deterministic bus number assignment.
> 
> So as to keep compatibility with existing Pixel userspace builds, use
> the same bus numbers for hsi2c_8 and hsi2c_12 as the downstream
> drivers with the intention to eventually add all the earlier busses as
> well.
> 
> Suggested-by: Will McVicker <willmcvicker@...gle.com>
> Signed-off-by: André Draszik <andre.draszik@...aro.org>

Tested-by: Will McVicker <willmcvicker@...gle.com>

> 
> ---
> Note, this patch should only be applied after series
> "[PATCH v3 0/7] gs101 oriole: peripheral block 1 (peric1) and i2c12 support"
> https://lore.kernel.org/all/20240129174703.1175426-1-andre.draszik@linaro.org/
> ---
>  arch/arm64/boot/dts/exynos/google/gs101-oriole.dts | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts b/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
> index 6ccade2c8cb4..23314ed78c96 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
> +++ b/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
> @@ -18,6 +18,8 @@ / {
>  	compatible = "google,gs101-oriole", "google,gs101";
>  
>  	aliases {
> +		i2c7 = &hsi2c_8;
> +		i2c8 = &hsi2c_12;
>  		serial0 = &serial_0;
>  	};
>  
> -- 
> 2.43.0.429.g432eaa2c6b-goog
> 

I verified this works on my device:

  # ls -l /sys/bus/i2c/devices/
  total 0
  <snip> 7-0050 -> ../../../devices/platform/soc@...09700c0.usi/10970000.i2c/i2c-7/7-0050
  <snip> i2c-7 -> ../../../devices/platform/soc@...09700c0.usi/10970000.i2c/i2c-7
  <snip> i2c-8 -> ../../../devices/platform/soc@...0d500c0.usi/10d50000.i2c/i2c-8


Thanks,
Will