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From: Drew Fustini <drew@beagleboard.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Michael Zhu <michael.zhu@starfivetech.com>,
	Fu Wei <tekkamanninja@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	Huan Feng <huan.feng@starfivetech.com>
Subject: Re: [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings
Date: Fri, 2 Jul 2021 23:46:00 -0700	[thread overview]
Message-ID: <20210703064600.GA1050194@x1> (raw)
In-Reply-To: <CAMuHMdXiebr7SnpShhcN9BPyha+=n=cNiX88q0wMVLrDY0r=qA@mail.gmail.com>

On Fri, Jul 02, 2021 at 11:03:56PM +0200, Geert Uytterhoeven wrote:
> Hi Drew,
> 
> On Fri, Jul 2, 2021 at 10:56 PM Drew Fustini <drew@beagleboard.org> wrote:
> > On Thu, Jul 01, 2021 at 10:34:56AM +0200, Geert Uytterhoeven wrote:
> > > On Thu, Jul 1, 2021 at 2:22 AM Drew Fustini <drew@beagleboard.org> wrote:
> > > > Add bindings for the GPIO controller in the StarFive JH7100 SoC [1].
> > > >
> > > > [1] https://github.com/starfive-tech/beaglev_doc
> > > >
> > > > Signed-off-by: Drew Fustini <drew@beagleboard.org>
> > > > Signed-off-by: Huan Feng <huan.feng@starfivetech.com>
> > >
> > > Thanks for your patch!
> > >
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/gpio/starfive,jh7100-gpio.yaml
> > > > @@ -0,0 +1,60 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/gpio/starfive,jh7100-gpio.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: StarFive JH7100 GPIO controller
> > > > +
> > > > +maintainers:
> > > > +  - Huan Feng <huan.feng@starfivetech.com>
> > > > +  - Drew Fustini <drew@beagleboard.org>
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    items:
> > > > +      - const: starfive,jh7100-gpio
> > > > +
> > > > +  reg:
> > > > +    maxItems: 1
> > > > +
> > > > +  interrupts:
> > > > +    description:
> > > > +      Interrupt mapping, one per GPIO. Maximum 32 GPIOs.
> > > > +    minItems: 1
> > > > +    maxItems: 32
> > >
> > > What about clocks and resets?
> >
> > Thank you for your feedback, Geert.
> >
> > GPIO controller uses clk_apb1_bus under dom0_sys.  I believe the device
> > tree node would use something like this:
> >
> >   clocks = <&clkgen JH7100_CLK_APB1>;
> >
> > I see the sifive-gpio.yaml has:
> >
> >   clocks:
> >     maxItems: 1
> >
> > Would that be the correct way to do it for the starfive gpio yaml?
> 
> Yep.
> 
> > The reset for GPIO controller is presetn under dom_sys.  Do you think
> > know you know an example that has reset in the YAML?  Is there some code
> > that would actually make use of that information?
> >
> > >
> > > > +
> > > > +  gpio-controller: true
> > > > +
> > > > +  "#gpio-cells":
> > > > +    const: 2
> > > > +
> > > > +  interrupt-controller: true
> > > > +
> > > > +  "#interrupt-cells":
> > > > +    const: 2
> > > > +
> > > > +required:
> > > > +  - compatible
> > > > +  - reg
> > > > +  - interrupts
> > > > +  - interrupt-controller
> > > > +  - "#interrupt-cells"
> > > > +  - "#gpio-cells"
> > > > +  - gpio-controller
> >
> > Do you think I should add 'clocks' to 'required:'?
> 
> I'm still having issues with i2c if the GPIO block lists a clock, due to
> fw_devlink dependencies.
> 
> > > > +
> > > > +additionalProperties: false
> > > > +
> > > > +examples:
> > > > +  - |
> > > > +      gpio@11910000 {
> > > > +        compatible = "starfive,jh7100-gpio";
> > > > +        reg = <0x11910000 0x10000>;
> > > > +        gpio-controller;
> > > > +        #gpio-cells = <2>;
> > > > +        interrupt-controller;
> > > > +        #interrupt-cells = <2>;
> > > > +        interrupts = <32>;
> >
> > I would add:
> >
> >   clocks = <&clkgen JH7100_CLK_APB1>;
> >
> > But I am not sure how reset would work?
> 
> That should become "resets = <&rstgen JH7100_RSTN_GPIO_APB>",
> but we don't have the reset controller in Linux yet (we do in barebox).

Do you think I should add reset item like this?

  resets:
    maxItems: 1

I suppose this is supposed to describe the hardware and it shouldn't
matter whether or not Linux uses the property, right?

Thank you,
Drew

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  reply	other threads:[~2021-07-03  6:46 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01  0:20 [RFC PATH 0/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO bindings and driver Drew Fustini
2021-07-01  0:20 ` [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings Drew Fustini
2021-07-01  8:34   ` [RFC PATH 1/2] dt-bindings: gpio: add starfive, jh7100-gpio bindings Geert Uytterhoeven
2021-07-02 20:56     ` [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings Drew Fustini
2021-07-02 21:03       ` [RFC PATH 1/2] dt-bindings: gpio: add starfive, jh7100-gpio bindings Geert Uytterhoeven
2021-07-03  6:46         ` Drew Fustini [this message]
2021-07-03  8:49           ` Geert Uytterhoeven
2021-07-01  0:20 ` [RFC PATH 2/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO driver Drew Fustini
2021-07-01  2:25   ` Bin Meng
2021-07-01 20:44     ` Drew Fustini
2021-07-01  6:39   ` Michael Walle
2021-07-01 20:33     ` Drew Fustini
2021-07-02 14:59       ` Michael Walle
2021-07-02 21:00     ` Drew Fustini
2021-07-23 21:04     ` Linus Walleij
2021-07-26  7:11       ` Drew Fustini
2021-07-26  7:21         ` Michael Walle
2021-07-27  5:28           ` Drew Fustini
2021-07-28  9:49             ` Michael Walle
2021-07-28 10:59               ` Emil Renner Berthing
2021-07-28 11:19                 ` Michael Walle
2021-07-28 11:21                   ` Emil Renner Berthing
2021-07-02 16:03   ` Andy Shevchenko
2021-07-02 21:06     ` Drew Fustini
2021-07-05 13:29       ` Michael Walle
2021-07-05 14:33         ` Matti Vaittinen
2021-07-15  1:49   ` Ley Foon Tan

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