| Message ID | 20241008082051.4002438-1-wenst@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: dts: mediatek: mt8173-elm-hana: Add vdd-supply to second source trackpad | expand |
Il 08/10/24 10:20, Chen-Yu Tsai ha scritto: > The Hana device has a second source option trackpad, but it is missing > its regulator supply. It only works because the regulator is marked as > always-on. > > Add the regulator supply, and the required post-power-on delay. > > Fixes: 689b937bedde ("arm64: dts: mediatek: add mt8173 elm and hana board") > Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> > --- > arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > index 8d1cbc92bce3..e03474702cad 100644 > --- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > @@ -49,6 +49,12 @@ trackpad2: trackpad@2c { > interrupts-extended = <&pio 117 IRQ_TYPE_LEVEL_LOW>; > reg = <0x2c>; > hid-descr-addr = <0x0020>; > + /* > + * The supply is always on. Adding the delay here > + * needlessly delays the readiness of the trackpad. I'd say, let's be nice in this comment and let's explain the whole situation: The trackpad needs a post power on delay of 100ms but, at the time of writing, the power supply for it on this board is set as always-on, so we don't add that to avoid useless delays in the readiness of this device. ...or.... The trackpad needs a post power on delay of 100ms but the power supply for it on this board is always-on (and will always be), so we don't add delays to avoid impacting on the time required for readiness of this device. > + */ > + /* post-power-on-delay-ms = <100>; */ Then you can remove this commented out property ;-) P.S.: Just to be clear, what I dislike is to see a property that is commented out. Cheers, Angelo > + vdd-supply = <&mt6397_vgp6_reg>; > wakeup-source; > }; > };
On Tue, Oct 8, 2024 at 4:47 PM AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> wrote: > > Il 08/10/24 10:20, Chen-Yu Tsai ha scritto: > > The Hana device has a second source option trackpad, but it is missing > > its regulator supply. It only works because the regulator is marked as > > always-on. > > > > Add the regulator supply, and the required post-power-on delay. > > > > Fixes: 689b937bedde ("arm64: dts: mediatek: add mt8173 elm and hana board") > > Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> > > --- > > arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > > index 8d1cbc92bce3..e03474702cad 100644 > > --- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > > +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi > > @@ -49,6 +49,12 @@ trackpad2: trackpad@2c { > > interrupts-extended = <&pio 117 IRQ_TYPE_LEVEL_LOW>; > > reg = <0x2c>; > > hid-descr-addr = <0x0020>; > > + /* > > + * The supply is always on. Adding the delay here > > + * needlessly delays the readiness of the trackpad. > > I'd say, let's be nice in this comment and let's explain the whole situation: > > The trackpad needs a post power on delay of 100ms but, at the time > of writing, the power supply for it on this board is set as always-on, > so we don't add that to avoid useless delays in the readiness of this device. > > > ...or.... > > The trackpad needs a post power on delay of 100ms but the power supply for > it on this board is always-on (and will always be), so we don't add delays > to avoid impacting on the time required for readiness of this device. > > > + */ > > + /* post-power-on-delay-ms = <100>; */ > > Then you can remove this commented out property ;-) > > P.S.: Just to be clear, what I dislike is to see a property that is commented out. Got it. Will rewrite. :D ChenYu
diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi index 8d1cbc92bce3..e03474702cad 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi @@ -49,6 +49,12 @@ trackpad2: trackpad@2c { interrupts-extended = <&pio 117 IRQ_TYPE_LEVEL_LOW>; reg = <0x2c>; hid-descr-addr = <0x0020>; + /* + * The supply is always on. Adding the delay here + * needlessly delays the readiness of the trackpad. + */ + /* post-power-on-delay-ms = <100>; */ + vdd-supply = <&mt6397_vgp6_reg>; wakeup-source; }; };
The Hana device has a second source option trackpad, but it is missing its regulator supply. It only works because the regulator is marked as always-on. Add the regulator supply, and the required post-power-on delay. Fixes: 689b937bedde ("arm64: dts: mediatek: add mt8173 elm and hana board") Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> --- arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 6 ++++++ 1 file changed, 6 insertions(+)