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

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Date:   Fri, 17 Dec 2021 17:00:58 +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 <atishp@...shpatra.org>
Subject: Re: [PATCH v2 14/17] riscv: dts: microchip: add fpga fabric section
 to icicle kit

Hi Conor,

On Fri, Dec 17, 2021 at 4:32 PM <Conor.Dooley@...rochip.com> wrote:
> On 17/12/2021 13:43, Geert Uytterhoeven wrote:
> > 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?
> Not yet (assuming you mean specifically how we will handle it in the
> device tree) - although i was talking to someone about it yesterday.
> It's possible that we might handle that via a register, but if you have
> a suggestion or some precedence that you're aware of that would be useful.
>
> The actual naming convention of the IP cores themselves, yeah. I will
> dig it up for you on Monday.

I meant what if corepwm is enhanced, and how to detect that?

SiFive uses an integer version number, even for hard cores[1].
OpenCores uses an "-rtlsvnN" suffix (isn't svn dead? ;-)
No idea what e.g. LiteX and Microwatt are planning.

[1] Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt


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