linux-kernel - Re: [PATCH] arm: dts: aspeed: Use standard 'i2c' bus node name

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Date: Mon, 24 Jun 2024 06:46:57 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Joel Stanley <joel@....id.au>, "Rob Herring (Arm)" <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Andrew Jeffery <andrew@...econstruct.com.au>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: dts: aspeed: Use standard 'i2c' bus node name

On 24/06/2024 03:55, Joel Stanley wrote:
> On Sat, 1 Jun 2024 at 05:01, Rob Herring (Arm) <robh@...nel.org> wrote:
>>
>> The standard node name for I2C buses is 'i2c'.
> 
> Unfortunately this can't be merged, as it will break userspace. There
> is a lot of code out there that looks up devices based on the device
> tree node path:
> 
> https://github.com/openbmc/phosphor-state-manager/blob/3c1351cc2b63178876ef68f4107c9804d2e17dcc/meson.options#L140

Eh, thanks for sharing.

That's totally stupid user-space. The sysfs path to /sys/devices, or
some grep by compatible, would be fine, but iterating over firmware/DT
is just wrong.

Reminds me USB and ChromeOS. They could fix their userspace, so probably
folks here can as well. I filled a bug.

Best regards,
Krzysztof