linux-kernel - Re: [PATCH v3 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC

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Message-ID: <20241114070601-GYA1001363@gentoo>
Date: Thu, 14 Nov 2024 15:06:01 +0800
From: Yixun Lan <dlan@...too.org>
To: Conor Dooley <conor@...nel.org>
Cc: Troy Mitchell <troymitchell988@...il.com>,
	Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-riscv@...ts.infradead.org,
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC

On 18:03 Tue 12 Nov     , Conor Dooley wrote:
> On Tue, Nov 12, 2024 at 11:07:39AM +0800, Troy Mitchell wrote:
> > From: Troy Mitchell <troymitchell988@...il.com>
> > 
> > The I2C of K1 supports fast-speed-mode and high-speed-mode,
> > and supports FIFO transmission.
> > 
> > Signed-off-by: Troy Mitchell <TroyMitchell988@...il.com>
> > ---
> >  .../devicetree/bindings/i2c/spacemit,k1-i2c.yaml   | 52 ++++++++++++++++++++++
> >  1 file changed, 52 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
> > new file mode 100644
> > index 000000000000..e8cce360bf03
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
> > @@ -0,0 +1,52 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/i2c/spacemit,k1-i2c.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: I2C controller embedded in SpacemiT's K1 SoC
> > +
> > +maintainers:
> > +  - Troy Mitchell <troymitchell988@...il.com>
> > +
> > +properties:
> > +  compatible:
> > +    const: spacemit,k1-i2c
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-frequency:
> > +    description:
> > +      Desired I2C bus clock frequency in Hz.
> > +      K1 supports standard, fast, high-speed modes, from 1 to 3300000.
while we are here, I'd suggest rephrase the sentence above to align it better with the doc

K1 support three different modes which running different frequencies
standard speed mode: up to 100000 (100Hz)
fast speed mode    : up to 400000 (400Hz)
high speed mode    : up to 3300000 (3.3Mhz)

> > +    default: 100000
> > +    minimum: 1
> > +    maximum: 3300000
> 
> It's sufficient to define just default and max btw, the min is set in
> i2c-controller.yaml (in dt-schema itself). Don't respin for that alone.
+1, the minimum settings isn't really useful, clearly not apply in the practical case

> 
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c@...10800 {
> > +        compatible = "spacemit,k1-i2c";
> > +        reg = <0xd4010800 0x38>;
> > +        interrupt-parent = <&plic>;
> > +        interrupts = <36>;
> > +        clocks = <&ccu 90>;
> > +        clock-frequency = <100000>;
> > +    };
> > +
> > +...
> > 
> > -- 
> > 2.34.1
> > 



-- 
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55