linux-kernel - Re: [PATCH v2 2/7] drm: ci: Force db410c to host mode

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Date:   Tue, 5 Sep 2023 15:40:57 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Vignesh Raman <vignesh.raman@...labora.com>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        dri-devel@...ts.freedesktop.org, helen.koike@...labora.com,
        guilherme.gallo@...labora.com, sergi.blanch.torne@...labora.com,
        david.heidelberg@...labora.com, daniels@...labora.com,
        gustavo.padovan@...labora.com, emma@...olt.net,
        robclark@...edesktop.org, robdclark@...gle.com, anholt@...gle.com,
        robdclark@...il.com, airlied@...il.com, daniel@...ll.ch,
        jani.nikula@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/7] drm: ci: Force db410c to host mode

On Tue, Sep 05, 2023 at 07:06:43PM +0530, Vignesh Raman wrote:
> Hi Maxime,
> 
> On 05/09/23 17:27, Maxime Ripard wrote:
> > On Tue, Sep 05, 2023 at 05:11:43PM +0530, Vignesh Raman wrote:
> > > > > Also, that node actually has a label ("usb"), defined here:
> > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/msm8916.dtsi#n2322
> > > > > 
> > > > > So you can end up with
> > > > > 
> > > > > &usb {
> > > > >           dr_mode = "host";
> > > > > };
> > > > 
> > > > ... which is the simplest and thus more robust one.
> > > > 
> > > 
> > > Should it be,
> > > &{/soc@...sb} {
> > > 	dr_mode = "host";
> > > };
> > 
> > No. The &{/...} syntax refers to a path. &... refers to a label. They
> > are not equivalent.
> 
> Sorry I was not clear before.
> 
> With,
> &usb {
> 	dr_mode = "host";
> };
> 
> The target is <0xffffffff> and fdtoverlay fails to apply the dtbo.

You do have /plugin/ and have compiled the base device tree with overlay
support, right?

> With,
> &{/soc@...sb} {
>          dr_mode = "host";
> };
> 
> The target-path is "/soc@...sb" (usb: usb@...9000)

Right, and that's not the path you want to modify. The path you want to
modify is /soc@...sb@...9000. usb is the label, it's absolute, and you
can't mix and match a path ("/soc@0/") and a label ("usb")

Maxime

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