linux-kernel - Re: [PATCH 5/6] riscv: dts: add initial board data for the SiFive HiFive Unleashed

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Date:   Thu, 11 Apr 2019 08:03:04 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Paul Walmsley <paul@...an.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH 5/6] riscv: dts: add initial board data for the SiFive
 HiFive Unleashed

On Thu, Apr 11, 2019 at 3:43 AM Paul Walmsley <paul.walmsley@...ive.com> wrote:
>
> Add initial board data for the SiFive HiFive Unleashed A00.
>
> Currently the data populated in this DT file describes the board
> DRAM configuration and the external clock sources that supply the
> PRCI.
>
> This second version adds onboard SPI device data, fixes the board's
> memory size, and adds changes based on comments from Rob Herring
> <robh+dt@...nel.org>.
>
> Signed-off-by: Paul Walmsley <paul.walmsley@...ive.com>
> Signed-off-by: Paul Walmsley <paul@...an.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Palmer Dabbelt <palmer@...ive.com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: devicetree@...r.kernel.org
> Cc: linux-riscv@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/riscv/boot/dts/sifive/Makefile           |  2 +
>  .../dts/sifive/hifive-unleashed-a00-fu540.dts | 69 +++++++++++++++++++
>  2 files changed, 71 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/sifive/Makefile
>  create mode 100644 arch/riscv/boot/dts/sifive/hifive-unleashed-a00-fu540.dts
>
> diff --git a/arch/riscv/boot/dts/sifive/Makefile b/arch/riscv/boot/dts/sifive/Makefile
> new file mode 100644
> index 000000000000..fb825db888df
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sifive/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +dtb-$(CONFIG_ARCH_SIFIVE) += hifive-unleashed-a00-fu540.dtb
> diff --git a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00-fu540.dts b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00-fu540.dts
> new file mode 100644
> index 000000000000..9d35e811a3aa
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00-fu540.dts
> @@ -0,0 +1,69 @@
> +// SPDX-License-Identifier: (Apache-2.0 OR GPL-2.0+)
> +/* Copyright (c) 2018-2019 SiFive, Inc */
> +
> +/dts-v1/;
> +
> +#include "fu540-c000.dtsi"
> +
> +/* Clock frequency (in Hz) of the PCB crystal for rtcclk */
> +#define RTCCLK_FREQ            1000000
> +
> +/ {
> +       #address-cells = <2>;
> +       #size-cells = <2>;
> +       model = "SiFive HiFive Unleashed A00 (FU540-C000)";
> +       compatible = "sifive,hifive-unleashed-a00-fu540",
> +               "sifive,hifive-unleashed-fu540",
> +               "sifive,fu540-c000", "sifive-fu540";

This doesn't match your schema which has 3 entries. Really, 4 entries
is kind of pointless typically. Usually, just a board and SoC
compatible are enough.

> +
> +       chosen {
> +       };
> +
> +       cpus {
> +               timebase-frequency = <RTCCLK_FREQ>;
> +       };
> +
> +       memory@...00000 {
> +               device_type = "memory";
> +               reg = <0x0 0x80000000 0x2 0x00000000>;
> +       };
> +
> +       soc {
> +       };
> +
> +       hfclk: hfclk {
> +               #clock-cells = <0>;
> +               compatible = "fixed-clock";
> +               clock-frequency = <33333333>;
> +               clock-output-names = "hfclk";
> +       };
> +
> +       rtcclk: rtcclk {
> +               #clock-cells = <0>;
> +               compatible = "fixed-clock";
> +               clock-frequency = <RTCCLK_FREQ>;
> +               clock-output-names = "rtcclk";
> +       };
> +};
> +
> +&qspi0 {
> +       flash@0 {
> +               compatible = "issi,is25wp256d", "jedec,spi-nor";
> +               reg = <0>;
> +               spi-max-frequency = <50000000>;
> +               m25p,fast-read;
> +               spi-tx-bus-width = <4>;
> +               spi-rx-bus-width = <4>;
> +       };
> +};
> +
> +&qspi2 {
> +       status = "okay";
> +       mmc@0 {
> +               compatible = "mmc-spi-slot";
> +               reg = <0>;
> +               spi-max-frequency = <20000000>;
> +               voltage-ranges = <3300 3300>;
> +               disable-wp;
> +       };
> +};
> --
> 2.20.1
>