linux-kernel - Re: Fixing the devicetree of Rock 5 Model B (and possibly others)

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Date: Sat, 23 Mar 2024 18:09:59 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Pratham Patel <prathampatel@...fossguy.com>
Cc: sebastian.reichel@...labora.com, saravanak@...gle.com,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 regressions@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: Fixing the devicetree of Rock 5 Model B (and possibly others)

Hello Pratham,

On 2024-03-23 18:02, Pratham Patel wrote:
> Since the introduction of the `of: property: fw_devlink: Fix stupid
> bug in remote-endpoint parsing` patch, an issue with the device-tree
> of the Rock 5 Model B has been detected. All the stable kernels (6.7.y
> and 6.8.y) work on the Orange Pi 5, which has the Rockchip RK3588S SoC
> (same as the RK3588, but less I/O basically). So, being an owner of
> only two SBCs which use the RK3588* SoC, it appears that the Rock 5
> Model B's DT is incorrect.
> 
> I looked at the patch and tried several things, neither resulted in
> anything that would point me to the core issue. Then I tried this:

Could you, please, clarify a bit what's the actual issue you're
experiencing on your Rock 5B?

> ```
> $ grep -C 3 remote-endpoint 
> arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> 
>                 port {
>                         es8316_p0_0: endpoint {
>                                 remote-endpoint = <&i2s0_8ch_p0_0>;
>                         };
>                 };
>         };
> --
>                 i2s0_8ch_p0_0: endpoint {
>                         dai-format = "i2s";
>                         mclk-fs = <256>;
>                         remote-endpoint = <&es8316_p0_0>;
>                 };
>         };
> };
> ```
> 
> So, from a cursory look, the issue seems to be related to either the
> DT node for the audio codec or related to the es8316's binding itself.
> Though I doubt that the later is the issue because if that were the
> issue, _someone_ with a Pine64 Pinebook Pro would've raised alarms. So
> far, this seems to be related to the `rk3588-rock-5b.dts` and possibly
> with the `rk3588s-rock-5a.dts` too.
> 
> I would **love** to help but I'm afraid I device-trees are not
> something that I am at-all familiar with. That said, I am open to
> methods of debugging this issue to provide a fix myself.
> 
> I would have replied to the patch's link but unfortunately, I haven't
> yet setup neomutt and my email provider's web UI doesn't have a
> [straightforward] way to reply using the 'In-Reply-To' header, hence a
> new thread. Apologies for the inconvenience caused.
> 
>   -- Pratham Patel
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

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