linux-kernel - Re: [PATCH 2/3] dt-bindings: mfd: atmel,hlcdc: Convert to DT schema format

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Date: Wed, 10 Jan 2024 19:01:07 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Dharma Balasubiramani <dharma.b@...rochip.com>, sam@...nborg.org,
 bbrezillon@...nel.org, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
 claudiu.beznea@...on.dev, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, lee@...nel.org, thierry.reding@...il.com,
 u.kleine-koenig@...gutronix.de, linux-pwm@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: mfd: atmel,hlcdc: Convert to DT schema
 format

On 10/01/2024 11:25, Dharma Balasubiramani wrote:
> Convert the atmel,hlcdc binding to DT schema format.
> 
> Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
> ---
>  .../devicetree/bindings/mfd/atmel,hlcdc.yaml  | 106 ++++++++++++++++++
>  .../devicetree/bindings/mfd/atmel-hlcdc.txt   |  56 ---------
>  2 files changed, 106 insertions(+), 56 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml
>  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml b/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml
> new file mode 100644
> index 000000000000..555d6faa9104
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/atmel,hlcdc.yaml

This looks not tested, so limited review follows:

> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2024 Microchip Technology, Inc. and its subsidiaries
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/atmel,hlcdc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel's HLCDC (High LCD Controller) MFD driver

Drop "MFD driver" and rather describe/name the hardware. MFD is Linux
term, so I really doubt that's how this was called.

> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +  - Alexandre Belloni <alexandre.belloni@...tlin.com>
> +  - Claudiu Beznea <claudiu.beznea@...on.dev>
> +
> +description: |
> +  Device-Tree bindings for Atmel's HLCDC (High LCD Controller) MFD driver.

Drop

> +  The HLCDC IP exposes two subdevices:
> +  # a PWM chip: see ../pwm/atmel,hlcdc-pwm.yaml
> +  # a Display Controller: see ../display/atmel/atmel,hlcdc-dc.yaml

Rephrase to describe hardware. Drop redundant paths.

> +
> +properties:
> +  compatible:
> +    enum:
> +      - atmel,at91sam9n12-hlcdc
> +      - atmel,at91sam9x5-hlcdc
> +      - atmel,sama5d2-hlcdc
> +      - atmel,sama5d3-hlcdc
> +      - atmel,sama5d4-hlcdc
> +      - microchip,sam9x60-hlcdc
> +      - microchip,sam9x75-xlcdc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 3
> +
> +  clock-names:
> +    anyOf:
> +      - items:
> +          - enum:
> +              - sys_clk
> +              - lvds_pll_clk

Old binding was not mentioning this and you did not describe differences
against pure conversion. You have entire commit msg for this...

> +      - contains:
> +          const: periph_clk
> +      - contains:
> +          const: slow_clk
> +        maxItems: 3

Why it has to be so complicated? I doubt that same devices have
different inputs.

> +
> +  hlcdc-display-controller:

Does anything depend on the name? If not, then just display-controller

> +    $ref: /schemas/display/atmel/atmel,hlcdc-dc.yaml
> +
> +  hlcdc-pwm:

Same comment.

> +    $ref: /schemas/pwm/atmel,hlcdc-pwm.yaml

There is no such file.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/dma/at91.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    hlcdc: hlcdc@...30000 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +      compatible = "atmel,sama5d3-hlcdc";
> +      reg = <0xf0030000 0x2000>;
> +      clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
> +      clock-names = "periph_clk","sys_clk", "slow_clk";

Missing space after ,

> +      interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
> +
> +      hlcdc-display-controller {
> +        compatible = "atmel,hlcdc-display-controller";
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        port@0 {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +          reg = <0>;
> +
> +          hlcdc_panel_output: endpoint@0 {
> +            reg = <0>;
> +            remote-endpoint = <&panel_input>;
> +          };
> +        };
> +      };
> +


Best regards,
Krzysztof