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References: <20231204084012.2281292-1-wenst@chromium.org> <20231204084012.2281292-7-wenst@chromium.org>
 <ab7988af-e7f9-433d-b35e-138f79ce82c0@collabora.com>
In-Reply-To: <ab7988af-e7f9-433d-b35e-138f79ce82c0@collabora.com>
From:   Chen-Yu Tsai <wenst@chromium.org>
Date:   Thu, 7 Dec 2023 14:28:24 +0900
Message-ID: <CAGXv+5EyHXWgbvtxx-skzi6FNEnZD8QEHQ2Wq224anY+QKUrew@mail.gmail.com>
Subject: Re: [PATCH v3 6/9] arm64: dts: mediatek: Add MT8186 Krabby platform
 based Tentacruel / Tentacool
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Cc:     Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        Conor Dooley <conor.dooley@microchip.com>
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On Mon, Dec 4, 2023 at 11:27=E2=80=AFPM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> Il 04/12/23 09:40, Chen-Yu Tsai ha scritto:
> > Tentacruel and Tentacool are MT8186 based Chromebooks based on the
> > Krabby design.
> >
> > Tentacruel, also known as the ASUS Chromebook CM14 Flip CM1402F, is a
> > convertible device with touchscreen and stylus.
> >
> > Tentacool, also known as the ASUS Chromebook CM14 CM1402C, is a laptop
> > device. It does not have a touchscreen or stylus.
> >
> > The two devices both have two variants. The difference is a second
> > source touchpad controller that shares the same address as the original=
,
> > but is incompatible.
> >
> > The extra SKU IDs for the Tentacruel devices map to different sensor
> > components attached to the Embedded Controller. These are not visible
> > to the main processor.
> >
> > Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
> > Acked-by: Conor Dooley <conor.dooley@microchip.com>
> > ---
> > Changes since v2:
> > - Picked up Conor's ack
> > - Rename touchpad to trackpad
> > - Drop pinctrl properties from trackpad in tentacruel/tentacool second
> >    source trackpad
> >
> > Changes since v1:
> > - Reorder SKU numbers in descending order.
> > - Fixed pinconfig node names
> > - Moved pinctrl-* properties after interrupts-*
> > - Switched to interrupts-extended for external components
> > - Marked ADSP as explicitly disabled, with a comment explaining that it
> >    stalls the system
> > - Renamed "touchpad" to "trackpad"
> > - Dropped bogus "no-laneswap" property from it6505 node
> > - Moved "realtek,jd-src" property to after all the regulator supplies
> > - Switched to macros for MT6366 regulator "regulator-allowed-modes"
> > - Renamed "vgpu" regulator name to allow coupling, with a comment
> >    containing the name used in the design
> > - Renamed "cr50" node name to "tpm"
> > - Moved trackpad_pins reference up to i2c2; workaround for second sourc=
e
> >    component resource sharing.
> > - Fix copyright year
> > - Fixed touchscreen supply name
> >
> >   arch/arm64/boot/dts/mediatek/Makefile         |    4 +
> >   .../dts/mediatek/mt8186-corsola-krabby.dtsi   |  129 ++
> >   .../mt8186-corsola-tentacool-sku327681.dts    |   57 +
> >   .../mt8186-corsola-tentacool-sku327683.dts    |   24 +
> >   .../mt8186-corsola-tentacruel-sku262144.dts   |   44 +
> >   .../mt8186-corsola-tentacruel-sku262148.dts   |   26 +
> >   .../boot/dts/mediatek/mt8186-corsola.dtsi     | 1719 ++++++++++++++++=
+
> >   7 files changed, 2003 insertions(+)
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby=
.dtsi
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola-tentac=
ool-sku327681.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola-tentac=
ool-sku327683.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola-tentac=
ruel-sku262144.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola-tentac=
ruel-sku262148.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dt=
s/mediatek/Makefile
> > index e6e7592a3645..442af61b1305 100644
> > --- a/arch/arm64/boot/dts/mediatek/Makefile
> > +++ b/arch/arm64/boot/dts/mediatek/Makefile
> > @@ -43,6 +43,10 @@ dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8183-kukui-kodama=
-sku32.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8183-kukui-krane-sku0.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8183-kukui-krane-sku176.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8183-pumpkin.dtb
> > +dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8186-corsola-tentacool-sku327681.dt=
b
> > +dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8186-corsola-tentacool-sku327683.dt=
b
> > +dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8186-corsola-tentacruel-sku262144.d=
tb
> > +dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8186-corsola-tentacruel-sku262148.d=
tb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8186-evb.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8192-asurada-hayato-r1.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) +=3D mt8192-asurada-hayato-r5-sku2.dtb
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi b/=
arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi
> > new file mode 100644
> > index 000000000000..9b2b64525961
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi
> > @@ -0,0 +1,129 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright 2022 Google LLC
> > + */
> > +
> > +/dts-v1/;
> > +#include "mt8186-corsola.dtsi"
> > +#include <dt-bindings/gpio/gpio.h>
> > +
> > +/ {
> > +     aliases {
> > +             i2c4 =3D &i2c4;
> > +     };
> > +};
> > +
> > +&dsi_out {
> > +     remote-endpoint =3D <&ps8640_in>;
> > +};
> > +
> > +&i2c0 {
> > +     clock-frequency =3D <400000>;
> > +
> > +     ps8640: edp-bridge@8 {
> > +             compatible =3D "parade,ps8640";
> > +             reg =3D <0x8>;
> > +             powerdown-gpios =3D <&pio 96 GPIO_ACTIVE_LOW>;
> > +             reset-gpios =3D <&pio 98 GPIO_ACTIVE_LOW>;
> > +             pinctrl-names =3D "default";
> > +             pinctrl-0 =3D <&ps8640_pins>;
> > +             vdd12-supply =3D <&mt6366_vrf12_reg>;
> > +             vdd33-supply =3D <&mt6366_vcn33_reg>;
> > +
> > +             ports {
> > +                     #address-cells =3D <1>;
> > +                     #size-cells =3D <0>;
> > +
> > +                     port@0 {
> > +                             reg =3D <0>;
> > +
> > +                             ps8640_in: endpoint {
> > +                                     remote-endpoint =3D <&dsi_out>;
> > +                             };
> > +                     };
> > +
> > +                     port@1 {
> > +                             reg =3D <1>;
> > +
> > +                             ps8640_out: endpoint {
> > +                                     remote-endpoint =3D <&panel_in>;
> > +                             };
> > +                     };
> > +             };
> > +
> > +             aux-bus {
> > +                     panel {
> > +                             compatible =3D "edp-panel";
> > +                             power-supply =3D <&pp3300_disp_x>;
> > +                             backlight =3D <&backlight_lcd0>;
> > +
> > +                             port {
> > +                                     panel_in: endpoint {
> > +                                             remote-endpoint =3D <&ps8=
640_out>;
> > +                                     };
> > +                             };
> > +                     };
> > +             };
> > +     };
> > +};
> > +
> > +&i2c1 {
> > +     i2c-scl-internal-delay-ns =3D <10000>;
> > +
> > +     touchscreen: touchscreen@10 {
> > +             compatible =3D "hid-over-i2c";
> > +             reg =3D <0x10>;
> > +             interrupts-extended =3D <&pio 12 IRQ_TYPE_LEVEL_LOW>;
> > +             pinctrl-names =3D "default";
> > +             pinctrl-0 =3D <&touchscreen_pins>;
> > +             post-power-on-delay-ms =3D <10>;
> > +             hid-descr-addr =3D <0x0001>;
> > +             vdd-supply =3D <&pp3300_s3>;
> > +     };
> > +};
> > +
> > +&i2c4 {
> > +     pinctrl-names =3D "default";
> > +     pinctrl-0 =3D <&i2c4_pins>;
> > +     clock-frequency =3D <400000>;
> > +     status =3D "okay";
> > +
> > +     proximity@28 {
> > +             compatible =3D "semtech,sx9324";
> > +             reg =3D <0x28>;
> > +             interrupts-extended =3D <&pio 5 IRQ_TYPE_LEVEL_LOW>;
> > +             pinctrl-names =3D "default";
> > +             pinctrl-0 =3D <&sar_sensor_pins>;
> > +             vdd-supply =3D <&mt6366_vio18_reg>;
> > +             svdd-supply =3D <&mt6366_vio18_reg>;
> > +             #io-channel-cells =3D <1>;
>
>  From the newest DTS coding style document:
>
> The following order of properties in device nodes is preferred:
>
> 1. compatible
> 2. reg
> 3. ranges
> 4. Standard/common properties (defined by common bindings, e.g. without
>     vendor-prefixes)
> 5. Vendor-specific properties
> 6. status (if applicable)
> 7. Child nodes, where each node is preceded with a blank line
>
> The "status" property is by default "okay", thus it can be omitted.
>
> The above-described ordering follows this approach:
>
> 1. Most important properties start the node: compatible then bus addressi=
ng to
>     match unit address.
> 2. Each node will have common properties in similar place.
> 3. Status is the last information to annotate that device node is or is n=
ot
>     finished (board resources are needed).

Wishing for a checking tool now. :p

> #io-channel-cells goes after `reg` (same for the other instances) :-)

Ack (though it looks weird).

> > +     };
> > +};
> > +
> > +&pio {
> > +     i2c4_pins: i2c4-pins {
> > +             pins-bus {
> > +                     pinmux =3D <PINMUX_GPIO136__FUNC_SDA4>,
> > +                              <PINMUX_GPIO135__FUNC_SCL4>;
> > +                     bias-disable;
> > +                     drive-strength =3D <4>;
> > +                     input-enable;
> > +             };
> > +     };
> > +
> > +     ps8640_pins: ps8640-pins {
> > +             pins-pwrdn-rst {
> > +                     pinmux =3D <PINMUX_GPIO96__FUNC_GPIO96>,
> > +                              <PINMUX_GPIO98__FUNC_GPIO98>;
> > +                     output-low;
> > +             };
> > +     };
> > +
> > +     sar_sensor_pins: sar-sensor-pins {
> > +             pins-irq {
> > +                     pinmux =3D <PINMUX_GPIO5__FUNC_GPIO5>;
> > +                     input-enable;
> > +                     bias-pull-up;
> > +             };
> > +     };
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku3=
27681.dts b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku327681=
.dts
> > new file mode 100644
> > index 000000000000..9bb64353ca65
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku327681.d=
ts
> > @@ -0,0 +1,57 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright 2022 Google LLC
> > + */
> > +
> > +/dts-v1/;
> > +#include "mt8186-corsola-krabby.dtsi"
> > +
> > +/ {
> > +     model =3D "Google Tentacool board";
> > +     compatible =3D "google,tentacruel-sku327681", "google,tentacruel"=
, "mediatek,mt8186";
> > +     chassis-type =3D "laptop";
> > +};
> > +
> > +/* Tentacool omits the pen. */
> > +&gpio_keys {
> > +     status =3D "disabled";
> > +};
> > +
> > +/* Tentacool omits the touchscreen; nothing else is on i2c1. */
> > +&i2c1 {
> > +     status =3D "disabled";
> > +};
> > +
> > +&keyboard_controller {
> > +     function-row-physmap =3D <
> > +             MATRIX_KEY(0x00, 0x02, 0)       /* T1 */
> > +             MATRIX_KEY(0x03, 0x02, 0)       /* T2 */
> > +             MATRIX_KEY(0x02, 0x02, 0)       /* T3 */
> > +             MATRIX_KEY(0x01, 0x02, 0)       /* T4 */
> > +             MATRIX_KEY(0x03, 0x04, 0)       /* T5 */
> > +             MATRIX_KEY(0x02, 0x04, 0)       /* T6 */
> > +             MATRIX_KEY(0x01, 0x04, 0)       /* T7 */
> > +             MATRIX_KEY(0x02, 0x09, 0)       /* T8 */
> > +             MATRIX_KEY(0x01, 0x09, 0)       /* T9 */
> > +             MATRIX_KEY(0x00, 0x04, 0)       /* T10 */
> > +     >;
> > +
> > +     linux,keymap =3D <
> > +             MATRIX_KEY(0x00, 0x02, KEY_BACK)
> > +             MATRIX_KEY(0x03, 0x02, KEY_REFRESH)
> > +             MATRIX_KEY(0x02, 0x02, KEY_ZOOM)
> > +             MATRIX_KEY(0x01, 0x02, KEY_SCALE)
> > +             MATRIX_KEY(0x03, 0x04, KEY_SYSRQ)
> > +             MATRIX_KEY(0x02, 0x04, KEY_BRIGHTNESSDOWN)
> > +             MATRIX_KEY(0x01, 0x04, KEY_BRIGHTNESSUP)
> > +             MATRIX_KEY(0x02, 0x09, KEY_MUTE)
> > +             MATRIX_KEY(0x01, 0x09, KEY_VOLUMEDOWN)
> > +             MATRIX_KEY(0x00, 0x04, KEY_VOLUMEUP)
> > +             CROS_STD_MAIN_KEYMAP
> > +     >;
> > +};
> > +
> > +/* Tentacool omits the touchscreen. */
> > +&touchscreen {
> > +     status =3D "disabled";
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku3=
27683.dts b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku327683=
.dts
> > new file mode 100644
> > index 000000000000..c3ae6f9616c8
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacool-sku327683.d=
ts
> > @@ -0,0 +1,24 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright 2023 Google LLC
> > + */
> > +
> > +#include "mt8186-corsola-tentacool-sku327681.dts"
> > +
> > +/ {
> > +     compatible =3D "google,tentacruel-sku327683", "google,tentacruel"=
, "mediatek,mt8186";
> > +};
> > +
> > +/* This variant replaces only the trackpad controller. */
> > +&i2c2 {
> > +     /delete-node/ trackpad@15;
>
> Why are you deleting the trackpad@15 node?
>
> You can simply override the compatible, or actually omit the compatible s=
tring
> in the *.dtsi file, and set just that in each board *.dts.
>
> dtsi:
>         trackpad_a: trackpad@15 {
>                 /* Compatible is set in each board dts */
>                 reg, interrupts, others
>         }
>
> dts:
>
> &trackpad_a {
>         compatible =3D "elan,ekth3000";
> };

The original trackpad@15 comes from the base design and is used for all
models other than the ones with the conflicting component. Hence I believe
it should live in the base .dtsi.

The delete-node makes it much less likely to have any lingering properties.
These are not nodes that just differ in compatible strings like DSI panels.
They have incompatible bindings. For example, elan,ekth3000 uses "vcc-suppl=
y",
while "hid-over-i2c" uses "vdd-supply".

And going back to my previous argument, the base design used one specific
model which is carried over to all the other models.

Suppose I add a phandle to the original trackpad, and do

    /delete-node/ &trackpad;

Would that be better?

> other dts:
>
> &trackpad_a {
>         compatible =3D "hid-over-i2c";
> };
>
> > +
> > +     trackpad@15 {
> > +             compatible =3D "hid-over-i2c";
> > +             reg =3D <0x15>;
> > +             interrupts-extended =3D <&pio 11 IRQ_TYPE_LEVEL_LOW>;
> > +             hid-descr-addr =3D <0x0001>;
> > +             vdd-supply =3D <&pp3300_s3>;
> > +             wakeup-source;
> > +     };
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku=
262144.dts b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku2621=
44.dts
> > new file mode 100644
> > index 000000000000..26d3451a5e47
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262144.=
dts
> > @@ -0,0 +1,44 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright 2022 Google LLC
> > + */
> > +
> > +/dts-v1/;
> > +#include "mt8186-corsola-krabby.dtsi"
> > +
> > +/ {
> > +     model =3D "Google Tentacruel board";
> > +     compatible =3D "google,tentacruel-sku262147", "google,tentacruel-=
sku262146",
> > +                  "google,tentacruel-sku262145", "google,tentacruel-sk=
u262144",
> > +                  "google,tentacruel", "mediatek,mt8186";
> > +     chassis-type =3D "convertible";
> > +};
> > +
> > +&keyboard_controller {
> > +     function-row-physmap =3D <
> > +             MATRIX_KEY(0x00, 0x02, 0)       /* T1 */
> > +             MATRIX_KEY(0x03, 0x02, 0)       /* T2 */
> > +             MATRIX_KEY(0x02, 0x02, 0)       /* T3 */
> > +             MATRIX_KEY(0x01, 0x02, 0)       /* T4 */
> > +             MATRIX_KEY(0x03, 0x04, 0)       /* T5 */
> > +             MATRIX_KEY(0x02, 0x04, 0)       /* T6 */
> > +             MATRIX_KEY(0x01, 0x04, 0)       /* T7 */
> > +             MATRIX_KEY(0x02, 0x09, 0)       /* T8 */
> > +             MATRIX_KEY(0x01, 0x09, 0)       /* T9 */
> > +             MATRIX_KEY(0x00, 0x04, 0)       /* T10 */
> > +     >;
> > +
> > +     linux,keymap =3D <
> > +             MATRIX_KEY(0x00, 0x02, KEY_BACK)
> > +             MATRIX_KEY(0x03, 0x02, KEY_REFRESH)
> > +             MATRIX_KEY(0x02, 0x02, KEY_ZOOM)
> > +             MATRIX_KEY(0x01, 0x02, KEY_SCALE)
> > +             MATRIX_KEY(0x03, 0x04, KEY_SYSRQ)
> > +             MATRIX_KEY(0x02, 0x04, KEY_BRIGHTNESSDOWN)
> > +             MATRIX_KEY(0x01, 0x04, KEY_BRIGHTNESSUP)
> > +             MATRIX_KEY(0x02, 0x09, KEY_MUTE)
> > +             MATRIX_KEY(0x01, 0x09, KEY_VOLUMEDOWN)
> > +             MATRIX_KEY(0x00, 0x04, KEY_VOLUMEUP)
> > +             CROS_STD_MAIN_KEYMAP
> > +     >;
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku=
262148.dts b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku2621=
48.dts
> > new file mode 100644
> > index 000000000000..447b57b12b41
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262148.=
dts
> > @@ -0,0 +1,26 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright 2023 Google LLC
> > + */
> > +
> > +#include "mt8186-corsola-tentacruel-sku262144.dts"
> > +
> > +/ {
> > +     compatible =3D "google,tentacruel-sku262151", "google,tentacruel-=
sku262150",
> > +                  "google,tentacruel-sku262149", "google,tentacruel-sk=
u262148",
> > +                  "google,tentacruel", "mediatek,mt8186";
> > +};
> > +
> > +/* This variant replaces only the trackpad controller. */
> > +&i2c2 {
> > +     /delete-node/ trackpad@15;
> > +
> > +     trackpad@15 {
> > +             compatible =3D "hid-over-i2c";
> > +             reg =3D <0x15>;
> > +             interrupts-extended =3D <&pio 11 IRQ_TYPE_LEVEL_LOW>;
> > +             hid-descr-addr =3D <0x0001>;
> > +             vdd-supply =3D <&pp3300_s3>;
> > +             wakeup-source;
> > +     };
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi b/arch/ar=
m64/boot/dts/mediatek/mt8186-corsola.dtsi
> > new file mode 100644
> > index 000000000000..8726b2916ef1
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
> > @@ -0,0 +1,1719 @@
> > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > +/*
> > + * Copyright (C) 2022 MediaTek Inc.
> > + */
> > +/dts-v1/;
> > +#include "mt8186.dtsi"
> > +#include <dt-bindings/pinctrl/mt8186-pinfunc.h>
> > +#include <dt-bindings/gpio/gpio.h>
> > +#include <dt-bindings/input/input.h>
> > +#include <dt-bindings/input/gpio-keys.h>
> > +#include <dt-bindings/regulator/mediatek,mt6397-regulator.h>
> > +
> > +/ {
> > +     aliases {
> > +             i2c0 =3D &i2c0;
> > +             i2c1 =3D &i2c1;
> > +             i2c2 =3D &i2c2;
> > +             i2c3 =3D &i2c3;
> > +             i2c5 =3D &i2c5;
> > +             mmc0 =3D &mmc0;
> > +             mmc1 =3D &mmc1;
> > +             serial0 =3D &uart0;
> > +     };
> > +
> > +     chosen {
> > +             stdout-path =3D "serial0:115200n8";
> > +     };
> > +
> > +     memory@40000000 {
> > +             device_type =3D "memory";
> > +             /* The size should be filled in by the bootloader. */
> > +             reg =3D <0 0x40000000 0 0>;
> > +     };
> > +
> > +     backlight_lcd0: backlight-lcd0 {
> > +             compatible =3D "pwm-backlight";
> > +             pwms =3D <&pwm0 0 500000>;
> > +             power-supply =3D <&ppvar_sys>;
> > +             enable-gpios =3D <&pio 152 0>;
> > +             brightness-levels =3D <0 1023>;
> > +             num-interpolated-steps =3D <1023>;
> > +             default-brightness-level =3D <576>;
> > +     };
> > +
> > +     btsco: bt-sco {
>
> Do you really need the phandle to bt-sco?

No. But the sound node probably should be referencing it and the dmic
node via DT instead of hardcoding the DAI and codec names in the machine
driver.

Anyway, will remove the label for now.

> Also, this node describes a codec, so: "bt-sco-codec" please!

Ack.

> > +             compatible =3D "linux,bt-sco";
> > +             #sound-dai-cells =3D <0>;
> > +     };
> > +
> > +     dmic_codec: dmic-codec {
>
> This phandle is unused...

Removed.

> ..snip..
>
> > +
> > +&adsp {
> > +     memory-region =3D <&adsp_dma_mem>, <&adsp_mem>;
> > +     status =3D "disabled"; /* causes stall */
>
> This is a firmware issue: once the correct firmware is uploaded to linux-=
firmware
> the dsp node can get enabled... so it we make sure that this happens befo=
re this
> devicetree gets picked, we can avoid a second commit enabling audio.
>
> After all, since we *want to* use the Xtensa DSP for audio, without it bo=
oted
> sound won't work *anyway*.... so having the firmware in place can also be=
 seen
> as a direct dependency of the entire audio functionality.
>
> P.S.: The FW that is distributed with ChromeOS works just fine!

I'll give that a try.

> > +};
> > +
> > +&afe {
> > +     i2s0-share =3D "I2S1";
> > +     i2s3-share =3D "I2S2";
> > +     status =3D "okay";
> > +};
> > +
>
> ..snip..
>
> > +&i2c2 {
> > +     pinctrl-names =3D "default";
> > +     /*
> > +      * Trackpad pin put here to work around second source components
> > +      * sharing the pinmux in steelix designs.
> > +      */
> > +     pinctrl-0 =3D <&i2c2_pins>, <&trackpad_pin>;
>
> There's no choice for now... even if this is not beautiful to see... but =
it's still
> ok for me because we can revisit this later when the HW Prober mechanism =
will be
> upstreamed.

Yup. Working on that.

> > +     clock-frequency =3D <400000>;
> > +     i2c-scl-internal-delay-ns =3D <10000>;
> > +     status =3D "okay";
> > +
> > +     trackpad@15 {
> > +             compatible =3D "elan,ekth3000";
> > +             reg =3D <0x15>;
> > +             interrupts-extended =3D <&pio 11 IRQ_TYPE_LEVEL_LOW>;
> > +             vcc-supply =3D <&pp3300_s3>;
> > +             wakeup-source;
> > +     };
> > +};
> > +
>
> Thanks,
> Angelo

Thanks for the review again.

ChenYu