Re: [RESEND PATCH 2/9] dt-bindings: arm64: bcmbca: Update BCM4908 description
From: William Zhang <william.zhang@broadcom.com>
Date: 2022-07-22 00:09:40
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On 07/21/2022 12:01 AM, Krzysztof Kozlowski wrote:
On 21/07/2022 08:51, Rafał Miłecki wrote:quoted
On 2022-07-21 08:44, Krzysztof Kozlowski wrote:quoted
On 21/07/2022 02:06, William Zhang wrote:quoted
Append "brcm,bcmbca" to BCM4908 chip family compatible strings. Add generic 4908 board entry.This does not explain at all why you are doing it. Improve your commit messages.To clarify it from my side (and maybe help a bit): 1. As I understand it BCMBCA is a one big family of SoCs. 2. BCM4908 is a subset of that family (a subfamily?) designed for a specific group of devices. If that's correct I think William it's what you should describe in your commit message. That would make binding more accurate and should be a good argument for your change (I believe).That's better argument. But what's the benefit of adding generic compatible? Devices cannot bind to it (it is too generic). Does it describe the device anyhow? Imagine someone adding compatible "brcm,all-soc-of-broadcom" - does it make any sense?
In case you were also referring the generic 4908 board compatible string brcm,bcm94908, this is for a bare bone 4908 board dts that only enables ARM cpu subsystem, memory and uart. It can be used on all 4908 based Broadcom reference boards and customer board. It is especially useful for initial board bring up and one can load this generic board and start work and debug from the console. Also would be helpful to do a quick verification of new kernel version when there is cpu subsystem related change. I guess my mindset already assume people are now familiar with this model of bcmbca binding addition for a new SoC since we introduced the bcmbca arch with first soc 47622 and 10+ other socs late. But sure I agree and I will update the commit message with more details in addition to what the cover letter says.
Best regards, Krzysztof
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