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Date: Thu, 27 Jun 2024 14:52:07 -0600
From: Rob Herring <robh@...nel.org>
To: Farouk Bouabid <farouk.bouabid@...rry.de>
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
Andi Shyti <andi.shyti@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
Quentin Schulz <quentin.schulz@...rry.de>,
Peter Rosin <peda@...ntia.se>, Heiko Stuebner <heiko@...ech.de>,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 3/9] dt-bindings: mfd: add support for mule
On Tue, Jun 18, 2024 at 06:06:45PM +0200, Farouk Bouabid wrote:
> Mule is an MCU that emulates a set of I2C devices, among which an amc6821
> device and an I2C mux that exposes more emulated devices. These two devices
> share the same I2C address. Only the I2C mux uses register (0xff) as a
> config register.
Everywhere (or the first place in any section (subject, commit msg,
title, description, etc.) you say 'mule' I think should be preceeded
with the vendor because 'mule' has no meaning on its own unless we are
talking animals.
>
> Add dt-binding support for the Mule I2C multi-function device.
>
> Signed-off-by: Farouk Bouabid <farouk.bouabid@...rry.de>
> ---
> .../devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml | 48 +++++++++++++
> .../devicetree/bindings/mfd/tsd,mule.yaml | 82 ++++++++++++++++++++++
> 2 files changed, 130 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml b/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml
> new file mode 100644
> index 000000000000..ac9dfc936272
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/tsd,mule-i2c-mux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mule I2C multiplexer
> +
> +maintainers:
> + - Farouk Bouabid <farouk.bouabid@...rry.de>
> + - Quentin Schulz <quentin.schulz@...rry.de>
> +
> +description: |
> + This module is part of the Mule I2C multi-function device. For more
> + details see ../mfd/tsd,mule.yaml.
> +
> + Mule I2C-mux configures the active device that can be accessed on address
> + 0x6f through the config register.
> +
> + +--------------------------------------------------+
> + | Mule |
> + 0x18| +---------------+ |
> + -------->|Config register|----+ |
> + | +---------------+ | |
> + | V_ |
> + | | \ +--------+ |
> + | | \-------->| dev #0 | |
> + | | | +--------+ |
> + 0x6f| | M |-------->| dev #1 | |
> + ---------------------------->| U | +--------+ |
> + | | X |-------->| dev #2 | |
> + | | | +--------+ |
> + | | /-------->| dev #3 | |
> + | |__/ +--------+ |
> + +--------------------------------------------------+
> +
> +
> +allOf:
> + - $ref: /schemas/i2c/i2c-mux.yaml#
> +
> +properties:
> + compatible:
> + const: tsd,mule-i2c-mux
> +
> +required:
> + - compatible
> +
> +unevaluatedProperties: false
> diff --git a/Documentation/devicetree/bindings/mfd/tsd,mule.yaml b/Documentation/devicetree/bindings/mfd/tsd,mule.yaml
> new file mode 100644
> index 000000000000..ab532340a17c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/tsd,mule.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/tsd,mule.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mule I2C multi function device
> +
> +maintainers:
> + - Farouk Bouabid <farouk.bouabid@...rry.de>
> + - Quentin Schulz <quentin.schulz@...rry.de>
> +
> +description:
> + Mule is an MCU that emulates a set of I2C devices, among which an amc6821
> + device and an I2C mux that exposes more emulated devices. These two devices
> + share the same I2C address. Only the I2C mux uses register (0xff) as a config
> + register.
> +
> +properties:
> + compatible:
> + const: tsd,mule
> +
> + reg:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> +patternProperties:
> + "^fan(@[0-9a-f]+)?$":
> + $ref: /schemas/trivial-devices.yaml
That doesn't really define which device. You should do something like
this:
additionalProperties: true
properties:
compatible:
contains:
const: ti,amc6821
If the compatible is correct, then the schema for it will be applied
separately.
> +
> + "^i2c-mux(@[0-9a-f]+)?$":
> + $ref: /schemas/i2c/tsd,mule-i2c-mux.yaml
> +
> +required:
> + - "#address-cells"
> + - "#size-cells"
> + - compatible
> + - reg
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + mule@18 {
> + compatible = "tsd,mule";
> + reg = <0x18>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + fan@18 {
> + compatible = "ti,amc6821";
> + reg = <0x18>;
> + };
> +
> + i2c-mux {
> + compatible = "tsd,mule-i2c-mux";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + i2c@0 {
> + reg = <0x0>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + rtc@6f {
> + compatible = "isil,isl1208";
> + reg = <0x6f>;
> + };
> + };
> + };
> + };
> + };
> +...
>
> --
> 2.34.1
>
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