linux-kernel - Re: [PATCH v2 14/17] riscv: dts: microchip: add fpga fabric section to icicle kit

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Message-ID: <CAMuHMdV0N-15kNZ1fnzaj_psNVCRUQP506Noc-tHawmgxqCVeA@mail.gmail.com>
Date:   Fri, 17 Dec 2021 14:43:10 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Mark Brown <broonie@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-rtc@...r.kernel.org, linux-spi <linux-spi@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bin Meng <bin.meng@...driver.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Lewis Hanly <lewis.hanly@...rochip.com>,
        daire.mcnamara@...rochip.com, ivan.griffin@...rochip.com,
        Atish Patra <atish.patra@....com>
Subject: Re: [PATCH v2 14/17] riscv: dts: microchip: add fpga fabric section
 to icicle kit

Hi Conor,

On Fri, Dec 17, 2021 at 10:33 AM <conor.dooley@...rochip.com> wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
>
> Split the device tree for the Microchip MPFS into two sections by adding
> microchip-mpfs-fabric.dtsi, which contains peripherals contained in the
> FPGA fabric.
>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks for your patch!

> --- /dev/null
> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-fabric.dtsi
> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/* Copyright (c) 2020-2021 Microchip Technology Inc */
> +
> +/ {
> +       corePWM0: pwm@...00000 {
> +               compatible = "microchip,corepwm";
> +               reg = <0x0 0x41000000 0x0 0xF0>;
> +               microchip,sync-update = /bits/ 8 <0>;
> +               #pwm-cells = <2>;
> +               clocks = <&clkcfg CLK_FIC3>;
> +               status = "disabled";
> +       };

I'm wondering if these should be grouped under a "fabric" subnode,
like we have an "soc" subnode for on-SoC devices? Rob?

BTW, do you already have a naming plan for different revisions of
FPGA fabric cores?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds