From: Doug Anderson <dianders@chromium.org> To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: Jiri Kosina <jikos@kernel.org>, Benjamin Tissoires <benjamin.tissoires@redhat.com>, Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Neil Armstrong <neil.armstrong@linaro.org>, Sam Ravnborg <sam@ravnborg.org>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>, dri-devel@lists.freedesktop.org, linux-input@vger.kernel.org, Dmitry Torokhov <dmitry.torokhov@gmail.com>, hsinyi@google.com, devicetree@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, linux-kernel@vger.kernel.org, Daniel Vetter <daniel@ffwll.ch>, linux-arm-msm@vger.kernel.org, cros-qcom-dts-watchers@chromium.org Subject: Re: [PATCH 1/9] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed panels Date: Tue, 30 May 2023 09:52:25 -0700 [thread overview] Message-ID: <CAD=FV=XJhVaFNcLZ_wA=vnYCVVxjq1NFxdV794C0mmxpqvPL6g@mail.gmail.com> (raw) In-Reply-To: <10457cab-f9b0-c38b-9f11-36853b71c7e8@linaro.org> Hi, On Tue, May 30, 2023 at 8:34 AM Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > > On 23/05/2023 21:27, Douglas Anderson wrote: > > As talked about in the patch ("drm/panel: Add a way for other devices > > to follow panel state"), touchscreens that are connected to panels are > > generally expected to be power sequenced together with the panel > > they're attached to. Today, nothing provides information allowing you > > to find out that a touchscreen is connected to a panel. Let's add a > > phandle for this. > > > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > > --- > > > > Documentation/devicetree/bindings/input/elan,ekth6915.yaml | 6 ++++++ > > Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 6 ++++++ > > Documentation/devicetree/bindings/input/hid-over-i2c.yaml | 6 ++++++ > > 3 files changed, 18 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > index 05e6f2df604c..d55b03bd3ec4 100644 > > --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > @@ -24,6 +24,12 @@ properties: > > interrupts: > > maxItems: 1 > > > > + panel: > > + description: If this is a touchscreen, the panel it's connected to. This > > Hm, can there be different setup? Touchscreen without panel? What would > it be then? For a touchscreen that's a discrete device (not sharing logic / power rails with the panel) you'd just leave off the panel node like we've always done. Assuming folks like this series in general, I'll try to improve the wording for v2. > Why only these touchscreens? This looks generic, so maybe in > touchscreen.yaml? Ah, that makes sense. I guess we need to add an include of that file from the elan and goodix bindings. The hid-over-i2c.yaml already has it, though. I'm not 100% sure the existing "hid-over-i2c" driver in Linux actually calls the function to parse all those properties, but I guess that's a Linux problem and not a DT bindings problem. ;-) -Doug
WARNING: multiple messages have this Message-ID (diff)
From: Doug Anderson <dianders@chromium.org> To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Cc: dri-devel@lists.freedesktop.org, Benjamin Tissoires <benjamin.tissoires@redhat.com>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Sam Ravnborg <sam@ravnborg.org>, linux-input@vger.kernel.org, hsinyi@google.com, devicetree@vger.kernel.org, Conor Dooley <conor+dt@kernel.org>, cros-qcom-dts-watchers@chromium.org, linux-arm-msm@vger.kernel.org, yangcong5@huaqin.corp-partner.google.com, Jiri Kosina <jikos@kernel.org>, Rob Herring <robh+dt@kernel.org>, Neil Armstrong <neil.armstrong@linaro.org>, Bjorn Andersson <andersson@kernel.org>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, linux-kernel@vger.kernel.org, Konrad Dybcio <konrad.dybcio@linaro.org>, Thomas Zimmermann <tzimmermann@suse.de> Subject: Re: [PATCH 1/9] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed panels Date: Tue, 30 May 2023 09:52:25 -0700 [thread overview] Message-ID: <CAD=FV=XJhVaFNcLZ_wA=vnYCVVxjq1NFxdV794C0mmxpqvPL6g@mail.gmail.com> (raw) In-Reply-To: <10457cab-f9b0-c38b-9f11-36853b71c7e8@linaro.org> Hi, On Tue, May 30, 2023 at 8:34 AM Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > > On 23/05/2023 21:27, Douglas Anderson wrote: > > As talked about in the patch ("drm/panel: Add a way for other devices > > to follow panel state"), touchscreens that are connected to panels are > > generally expected to be power sequenced together with the panel > > they're attached to. Today, nothing provides information allowing you > > to find out that a touchscreen is connected to a panel. Let's add a > > phandle for this. > > > > Signed-off-by: Douglas Anderson <dianders@chromium.org> > > --- > > > > Documentation/devicetree/bindings/input/elan,ekth6915.yaml | 6 ++++++ > > Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 6 ++++++ > > Documentation/devicetree/bindings/input/hid-over-i2c.yaml | 6 ++++++ > > 3 files changed, 18 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > index 05e6f2df604c..d55b03bd3ec4 100644 > > --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml > > @@ -24,6 +24,12 @@ properties: > > interrupts: > > maxItems: 1 > > > > + panel: > > + description: If this is a touchscreen, the panel it's connected to. This > > Hm, can there be different setup? Touchscreen without panel? What would > it be then? For a touchscreen that's a discrete device (not sharing logic / power rails with the panel) you'd just leave off the panel node like we've always done. Assuming folks like this series in general, I'll try to improve the wording for v2. > Why only these touchscreens? This looks generic, so maybe in > touchscreen.yaml? Ah, that makes sense. I guess we need to add an include of that file from the elan and goodix bindings. The hid-over-i2c.yaml already has it, though. I'm not 100% sure the existing "hid-over-i2c" driver in Linux actually calls the function to parse all those properties, but I guess that's a Linux problem and not a DT bindings problem. ;-) -Doug
next prev parent reply other threads:[~2023-05-30 16:53 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-05-23 19:27 [PATCH 0/9] drm/panel and i2c-hid: Allow panels and touchscreens to power sequence together Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-23 19:27 ` [PATCH 1/9] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed panels Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-30 15:34 ` Krzysztof Kozlowski 2023-05-30 15:34 ` Krzysztof Kozlowski 2023-05-30 16:52 ` Doug Anderson [this message] 2023-05-30 16:52 ` Doug Anderson 2023-05-23 19:27 ` [PATCH 2/9] drm/panel: Check for already prepared/enabled in drm_panel Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-24 9:52 ` Neil Armstrong 2023-05-24 9:52 ` Neil Armstrong 2023-05-24 16:57 ` Doug Anderson 2023-05-24 16:57 ` Doug Anderson 2023-05-24 16:19 ` Chris Morgan 2023-05-24 16:19 ` Chris Morgan 2023-05-24 17:04 ` Doug Anderson 2023-05-24 17:04 ` Doug Anderson 2023-05-23 19:27 ` [PATCH 3/9] drm/panel: Add a way for other devices to follow panel state Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-23 19:27 ` [PATCH 4/9] HID: i2c-hid: Switch to SYSTEM_SLEEP_PM_OPS() Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-23 19:27 ` [PATCH 5/9] HID: i2c-hid: Rearrange probe() to power things up later Douglas Anderson 2023-05-23 19:27 ` Douglas Anderson 2023-05-23 23:27 ` kernel test robot 2023-05-23 23:27 ` kernel test robot 2023-05-24 13:01 ` kernel test robot 2023-05-24 13:01 ` kernel test robot 2023-05-23 19:28 ` [PATCH 6/9] HID: i2c-hid: Make suspend and resume into helper functions Douglas Anderson 2023-05-23 19:28 ` Douglas Anderson 2023-05-23 19:28 ` [PATCH 7/9] HID: i2c-hid: Support being a panel follower Douglas Anderson 2023-05-23 19:28 ` Douglas Anderson 2023-05-24 0:28 ` kernel test robot 2023-05-24 0:28 ` kernel test robot 2023-05-24 15:37 ` kernel test robot 2023-05-24 15:37 ` kernel test robot 2023-05-24 17:29 ` Doug Anderson 2023-05-24 17:29 ` Doug Anderson 2023-05-23 19:28 ` [PATCH 8/9] HID: i2c-hid: Do panel follower work on the system_wq Douglas Anderson 2023-05-23 19:28 ` Douglas Anderson 2023-05-24 1:36 ` kernel test robot 2023-05-24 1:36 ` kernel test robot 2023-05-24 18:56 ` kernel test robot 2023-05-24 18:56 ` kernel test robot 2023-05-23 19:28 ` [PATCH 9/9] arm64: dts: qcom: sc7180: Link trogdor touchscreens to the panels Douglas Anderson 2023-05-23 19:28 ` Douglas Anderson 2023-05-23 21:39 ` [PATCH 0/9] drm/panel and i2c-hid: Allow panels and touchscreens to power sequence together Dmitry Torokhov 2023-05-23 21:39 ` Dmitry Torokhov 2023-05-23 23:52 ` Doug Anderson 2023-05-23 23:52 ` Doug Anderson 2023-05-26 19:29 ` Konrad Dybcio 2023-05-26 19:29 ` Konrad Dybcio
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