Re: [PATCH 1/2] rpmsg: qcom_smd: Fix fallback to qcom,ipc parse

[Dmitry Baryshkov]

On Mon, Apr 21, 2025 at 01:40:50PM +0200, barnabas.czeman@xxxxxxxxxxxxxx wrote:
> On 2025-04-21 12:38, Dmitry Baryshkov wrote:
> > On Mon, Apr 21, 2025 at 04:04:16AM +0200, Barnabás Czémán wrote:
> > > mbox_request_channel() returning value was changed in case of error.
> > > It uses returning value of of_parse_phandle_with_args().
> > > It is returning with -ENOENT instead of -ENODEV when no mboxes
> > > property
> > > exists.
> > 
> > Why? What is the rationale?
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/of/base.c#n1390
> mailbox: use error ret code of of_parse_phandle_with_args() this commit was
> changed the return value
> from ENODEV to use retrun value of of_parse_phandle_with_args what is
> returnung with EINVAL or ENOENT.
> It makes skipping fallback path to parse qcom,ipc if there is no mboxes
> property defined.
> As far as I know qcom,ipc now only needed for rpm smd-edge on some SoCs like
> 8939, 8916, 8976, 8917.
> arm64: dts: qcom: msm8939: revert use of APCS mbox for RPM
> > 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>

-- 
With best wishes
Dmitry