linux-kernel - Re: [PATCH 6/6] ARM: dts: aspeed: Add Facebook Fuji (AST2600) BMC

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Date:   Thu, 5 Aug 2021 00:28:02 +0000
From:   Joel Stanley <joel@....id.au>
To:     Tao Ren <rentao.bupt@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Andrew Jeffery <andrew@...id.au>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Tao Ren <taoren@...com>
Subject: Re: [PATCH 6/6] ARM: dts: aspeed: Add Facebook Fuji (AST2600) BMC

On Wed, 28 Jul 2021 at 23:38, <rentao.bupt@...il.com> wrote:
>
> From: Tao Ren <rentao.bupt@...il.com>
>
> Add initial version of device tree for Facebook Fuji (AST2600) BMC.

I like to read what kind of platform the BMC is going into if you can
add that detail, but it's not essential.

> +&spi1 {
> +       status = "okay";
> +
> +       /*
> +        * Customize spi1 flash memory size to 32MB (maximum flash size on
> +        * the bus) to save vmalloc space.
> +        */
> +       reg = < 0x1e630000 0xc4
> +               0x30000000 0x2000000 >;

Which driver supports this?

It would be great to see Facebook work to get the SPI NOR driver for
the ast2600 merged to mainline.

I doubt the IBM team will get to this, as we are using eMMC instead.

> +
> +       flash@0 {
> +               status = "okay";
> +               m25p,fast-read;
> +               label = "spi1.0";
> +               spi-max-frequency = <5000000>;
> +
> +               partitions {
> +                       compatible = "fixed-partitions";
> +                       #address-cells = <1>;
> +                       #size-cells = <1>;
> +
> +                       flash1@0 {
> +                               reg = <0x0 0x2000000>;
> +                               label = "system-flash";
> +                       };
> +               };
> +       };
> +};

> +&ehci1 {
> +       status = "okay";
> +};

Have you verified that USB works with mainline? I've had reports of it
working on 5.8 but it seems to have regressed as of v5.10.


> +&mdio1 {
> +       status = "okay";
> +
> +       ethphy3: ethernet-phy@13 {
> +               compatible = "ethernet-phy-ieee802.3-c22";
> +               reg = <0x0d>;
> +       };
> +};
> +
> +&mac3 {
> +       phy-handle = <&ethphy3>;

status = okay?

You should specify the pinmux too I think, even if the default happens
to work, so that other devices cannot claim the pins.

Cheers,

Joel