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 15:32:47 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <geert@...ux-m68k.org>
CC:     <linus.walleij@...aro.org>, <bgolaszewski@...libre.com>,
        <robh+dt@...nel.org>, <jassisinghbrar@...il.com>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <a.zummo@...ertech.it>,
        <alexandre.belloni@...tlin.com>, <broonie@...nel.org>,
        <gregkh@...uxfoundation.org>, <thierry.reding@...il.com>,
        <u.kleine-koenig@...gutronix.de>, <lee.jones@...aro.org>,
        <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-crypto@...r.kernel.org>, <linux-rtc@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <krzysztof.kozlowski@...onical.com>, <bin.meng@...driver.com>,
        <heiko@...ech.de>, <Lewis.Hanly@...rochip.com>,
        <Daire.McNamara@...rochip.com>, <Ivan.Griffin@...rochip.com>,
        <atish.patra@....com>
Subject: Re: [PATCH v2 14/17] riscv: dts: microchip: add fpga fabric section
 to icicle kit

On 17/12/2021 13:43, Geert Uytterhoeven wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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?
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.
> 
> 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
>