linux-kernel - Re: [PATCH v2] arm64: dts: mt8183-kukui: add scp node

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Date:   Thu, 10 Sep 2020 13:33:24 +0800
From:   Pi-Hsun Shih <pihsun@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Erin Lo <erin.lo@...iatek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: mt8183-kukui: add scp node

On Wed, Sep 9, 2020 at 4:58 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 09/09/2020 10:14, Pi-Hsun Shih wrote:
> > Add scp node to mt8183-kukui
> >
> > Fixes: 0d5e41709f76 ("arm64: dts: mt8183: add scp node")
> > Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>
> > ---
> >
> > Change since v1:
> > * Add Fixes tag.
> >
> > ---
> >   .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 30 +++++++++++++++++++
> >   1 file changed, 30 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> > index f0a070535b34..85f7c33ba446 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> > @@ -90,6 +90,18 @@ pp3300_alw: regulator6 {
> >               regulator-max-microvolt = <3300000>;
> >       };
> >
> > +     reserved_memory: reserved-memory {
> > +             #address-cells = <2>;
> > +             #size-cells = <2>;
> > +             ranges;
> > +
> > +             scp_mem_reserved: scp_mem_region {
> > +                     compatible = "shared-dma-pool";
> > +                     reg = <0 0x50000000 0 0x2900000>;
> > +                     no-map;
> > +             };
> > +     };
> > +
>
> Do we expect other boards to have a different memory reservation? I can see that
> EVB and Kukui uses the same. If not, we should add the node in mt8183.dtsi instead.
>
> Regards,
> Matthias

All our current boards use the same memory reservation, but it's still
possible for future boards based on mt8183 to use different SCP memory
size, so I feel this should still be left out of mt8183.dtsi.

>
> >       max98357a: codec0 {
> >               compatible = "maxim,max98357a";
> >               sdmode-gpios = <&pio 175 0>;
> > @@ -524,6 +536,13 @@ pins_clk {
> >               };
> >       };
> >
> > +     scp_pins: scp {
> > +             pins_scp_uart {
> > +                     pinmux = <PINMUX_GPIO110__FUNC_TP_URXD1_AO>,
> > +                              <PINMUX_GPIO112__FUNC_TP_UTXD1_AO>;
> > +             };
> > +     };
> > +
> >       spi0_pins: spi0 {
> >               pins_spi{
> >                       pinmux = <PINMUX_GPIO85__FUNC_SPI0_MI>,
> > @@ -651,6 +670,17 @@ pins_wifi_wakeup {
> >       };
> >   };
> >
> > +&scp {
> > +     status = "okay";
> > +     pinctrl-names = "default";
> > +     pinctrl-0 = <&scp_pins>;
> > +
> > +     cros_ec {
> > +             compatible = "google,cros-ec-rpmsg";
> > +             mtk,rpmsg-name = "cros-ec-rpmsg";
> > +     };
> > +};
> > +
> >   &soc_data {
> >       status = "okay";
> >   };
> >