linux-kernel - Re: [PATCH 0/9] drm/panel and i2c-hid: Allow panels and touchscreens to power sequence together

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Message-ID: <ZG0yjuNvhnircAxA@google.com>
Date:   Tue, 23 May 2023 14:39:26 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-input@...r.kernel.org,
        hsinyi@...gle.com, devicetree@...r.kernel.org,
        yangcong5@...qin.corp-partner.google.com,
        linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        linux-arm-msm@...r.kernel.org, cros-qcom-dts-watchers@...omium.org
Subject: Re: [PATCH 0/9] drm/panel and i2c-hid: Allow panels and touchscreens
 to power sequence together

Hi Doug,

On Tue, May 23, 2023 at 12:27:54PM -0700, Douglas Anderson wrote:
> 
> The big motivation for this patch series is mostly described in the patch
> ("drm/panel: Add a way for other devices to follow panel state"), but to
> quickly summarize here: for touchscreens that are connected to a panel we
> need the ability to power sequence the two device together. This is not a
> new need, but so far we've managed to get by through a combination of
> inefficiency, added costs, or perhaps just a little bit of brokenness.
> It's time to do better. This patch series allows us to do better.

This seems to grow a new way of building relationship between panels and
associated devices. Can we make device_link_*() work for us?

Thanks.

-- 
Dmitry