From: <Conor.Dooley@microchip.com>
To: <geert@linux-m68k.org>
Cc: <linus.walleij@linaro.org>, <bgolaszewski@baylibre.com>,
<robh+dt@kernel.org>, <jassisinghbrar@gmail.com>,
<paul.walmsley@sifive.com>, <palmer@dabbelt.com>,
<aou@eecs.berkeley.edu>, <a.zummo@towertech.it>,
<alexandre.belloni@bootlin.com>, <broonie@kernel.org>,
<gregkh@linuxfoundation.org>, <thierry.reding@gmail.com>,
<u.kleine-koenig@pengutronix.de>, <lee.jones@linaro.org>,
<linux-gpio@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-i2c@vger.kernel.org>,
<linux-pwm@vger.kernel.org>, <linux-riscv@lists.infradead.org>,
<linux-crypto@vger.kernel.org>, <linux-rtc@vger.kernel.org>,
<linux-spi@vger.kernel.org>, <linux-usb@vger.kernel.org>,
<krzysztof.kozlowski@canonical.com>, <bin.meng@windriver.com>,
<heiko@sntech.de>, <Lewis.Hanly@microchip.com>,
<Daire.McNamara@microchip.com>, <Ivan.Griffin@microchip.com>,
<atishp@rivosinc.com>
Subject: Re: [PATCH v4 03/14] dt-bindings: i2c: add bindings for microchip mpfs i2c
Date: Thu, 20 Jan 2022 13:42:25 +0000 [thread overview]
Message-ID: <889dab52-95eb-f36d-0af9-beea958a97e7@microchip.com> (raw)
In-Reply-To: <CAMuHMdXwe3_F8NeePnoFrLwyzKUwnHtmETC=ambgsC2N3w_h8A@mail.gmail.com>
On 20/01/2022 08:30, Geert Uytterhoeven wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> Hi Conor,
>
> On Mon, Jan 17, 2022 at 12:06 PM <conor.dooley@microchip.com> wrote:
>> From: Conor Dooley <conor.dooley@microchip.com>
>>
>> Add device tree bindings for the i2c controller on
>> the Microchip PolarFire SoC.
>>
>> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
>> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
>
> Thanks for your patch!
>
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
>> @@ -0,0 +1,55 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/i2c/microchip,mpfs-i2c.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Microchip MPFS I2C Controller Device Tree Bindings
>> +
>> +maintainers:
>> + - Daire McNamara <daire.mcnamara@microchip.com>
>> +
>> +allOf:
>> + - $ref: /schemas/i2c/i2c-controller.yaml#
>> +
>> +properties:
>> + compatible:
>> + enum:
>> + - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
>> + - microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core
>
> Wouldn't it be more logical to have:
>
> items:
> - const: microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
> - const: microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core
>
> ?
This would be fine for mpfs-i2c since corei2c is a "superset" - but how
would that look for the fabric core? I don't think falling back from the
fabric core onto the "hard" one makes sense. This would mean the
following two entries:
i2c2: i2c@44000000 { //fabric
compatible = "microchip,corei2c-rtl-v7";
};
i2c1: i2c@2010b000 { //"hard" mpfs peripheral
compatible = "microchip,mpfs-i2c", "microchip,corei2c-rtl-v7";
};
But this generates errors in dt_binding_check w/ your suggestion - so
how about the following (similar to ti,omap4-i2c.yaml):
compatible:
oneOf:
- items:
- const: microchip,mpfs-i2c # Microchip PolarFire...
- const: microchip,corei2c-rtl-v7 # Microchip Fabric...
- const: microchip,corei2c-rtl-v7 # Microchip Fabric...
Is there a prettier way than this duplication?
>
> If the IP core is reused, it can become:
>
> items:
> - enum:
> - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
> - microchip,<foo>-i2c # ...
> - const: microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core
>
> That way the driver can just match on the second (fallback) value,
> and no further driver changes will be needed (until v8 or later).
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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
>
next prev parent reply other threads:[~2022-01-20 13:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-17 11:07 [PATCH v4 00/14] Update the Icicle Kit device tree conor.dooley
2022-01-17 11:07 ` [PATCH v4 01/14] dt-bindings: soc/microchip: update syscontroller compatibles conor.dooley
2022-01-17 11:07 ` [PATCH v4 02/14] dt-bindings: soc/microchip: add services as children of sys ctrlr conor.dooley
2022-01-17 11:07 ` [PATCH v4 03/14] dt-bindings: i2c: add bindings for microchip mpfs i2c conor.dooley
2022-01-19 3:10 ` Rob Herring
2022-01-20 8:30 ` Geert Uytterhoeven
2022-01-20 13:42 ` Conor.Dooley [this message]
2022-01-20 14:56 ` Geert Uytterhoeven
2022-01-20 15:42 ` conor dooley
2022-01-17 11:07 ` [PATCH v4 04/14] dt-bindings: rtc: add bindings for microchip mpfs rtc conor.dooley
2022-01-19 3:12 ` Rob Herring
2022-01-19 10:47 ` Conor.Dooley
2022-01-17 11:07 ` [PATCH v4 05/14] dt-bindings: gpio: add bindings for microchip mpfs gpio conor.dooley
2022-01-19 3:12 ` Rob Herring
2022-01-17 11:07 ` [PATCH v4 06/14] dt-bindings: spi: add bindings for microchip mpfs spi conor.dooley
2022-01-19 3:13 ` Rob Herring
2022-01-17 11:07 ` [PATCH v4 07/14] dt-bindings: usb: add bindings for microchip mpfs musb conor.dooley
2022-01-19 3:13 ` Rob Herring
2022-01-17 11:07 ` [PATCH v4 08/14] dt-bindings: pwm: add microchip corepwm binding conor.dooley
2022-01-19 3:14 ` Rob Herring
2022-01-17 11:07 ` [PATCH v4 09/14] riscv: dts: microchip: use clk defines for icicle kit conor.dooley
2022-01-17 11:07 ` [PATCH v4 10/14] riscv: dts: microchip: add fpga fabric section to " conor.dooley
2022-01-17 11:07 ` [PATCH v4 11/14] riscv: dts: microchip: refactor icicle kit device tree conor.dooley
2022-01-18 11:14 ` Conor.Dooley
2022-01-17 11:07 ` [PATCH v4 12/14] riscv: dts: microchip: update peripherals in " conor.dooley
2022-01-17 11:07 ` [PATCH v4 13/14] riscv: dts: microchip: add new peripherals to " conor.dooley
2022-01-17 11:07 ` [PATCH v4 14/14] MAINTAINERS: update riscv/microchip entry conor.dooley
2022-01-25 10:21 ` (subset) [PATCH v4 00/14] Update the Icicle Kit device tree Mark Brown
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