linux-kernel - Re: [PATCH v5] ASoC: dt-bindings: omap-mcpdm: Convert to DT schema

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Date: Wed, 22 May 2024 09:22:22 -0500
From: Rob Herring <robh@...nel.org>
To: Péter Ujfalusi <peter.ujfalusi@...il.com>
Cc: Mighty <bavishimithil@...il.com>, Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Lopez Cruz <misael.lopez@...com>, linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] ASoC: dt-bindings: omap-mcpdm: Convert to DT schema

On Wed, May 22, 2024 at 04:56:11PM +0300, Péter Ujfalusi wrote:
> Hi,
> 
> On 22/05/2024 10:52, Mighty wrote:
> > From: Mithil Bavishi <bavishimithil@...il.com>
> > 
> > Convert the OMAP4+ McPDM bindings to DT schema.
> > 
> > Signed-off-by: Mithil Bavishi <bavishimithil@...il.com>
> > ---
> > Changelog v5:
> > - Add imports for constants
> > - Add desc to ti,hwmods
> > 
> >  .../devicetree/bindings/sound/omap-mcpdm.txt  | 30 ---------
> >  .../bindings/sound/ti,omap4-mcpdm.yaml        | 61 +++++++++++++++++++
> >  2 files changed, 61 insertions(+), 30 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/sound/omap-mcpdm.txt
> >  create mode 100644 Documentation/devicetree/bindings/sound/ti,omap4-mcpdm.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt b/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
> > deleted file mode 100644
> > index ff98a0cb5..000000000
> > --- a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
> > +++ /dev/null
> > @@ -1,30 +0,0 @@
> > -* Texas Instruments OMAP4+ McPDM
> > -
> > -Required properties:
> > -- compatible: "ti,omap4-mcpdm"
> > -- reg: Register location and size as an array:
> > -       <MPU access base address, size>,
> > -       <L3 interconnect address, size>;
> > -- interrupts: Interrupt number for McPDM
> > -- ti,hwmods: Name of the hwmod associated to the McPDM
> > -- clocks:  phandle for the pdmclk provider, likely <&twl6040>
> > -- clock-names: Must be "pdmclk"
> > -
> > -Example:
> > -
> > -mcpdm: mcpdm@...32000 {
> > -	compatible = "ti,omap4-mcpdm";
> > -	reg = <0x40132000 0x7f>, /* MPU private access */
> > -	      <0x49032000 0x7f>; /* L3 Interconnect */
> > -	interrupts = <0 112 0x4>;
> > -	interrupt-parent = <&gic>;
> > -	ti,hwmods = "mcpdm";
> > -};
> > -
> > -In board DTS file the pdmclk needs to be added:
> > -
> > -&mcpdm {
> > -	clocks = <&twl6040>;
> > -	clock-names = "pdmclk";
> > -	status = "okay";
> > -};
> > diff --git a/Documentation/devicetree/bindings/sound/ti,omap4-mcpdm.yaml b/Documentation/devicetree/bindings/sound/ti,omap4-mcpdm.yaml
> > new file mode 100644
> > index 000000000..966406078
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sound/ti,omap4-mcpdm.yaml
> > @@ -0,0 +1,61 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sound/ti,omap4-mcpdm.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: OMAP McPDM
> > +
> > +maintainers:
> > +  - Misael Lopez Cruz <misael.lopez@...com>
> > +
> > +description:
> > +  OMAP ALSA SoC DAI driver using McPDM port used by TWL6040
> > +
> > +properties:
> > +  compatible:
> > +    const: ti,omap4-mcpdm
> > +
> > +  reg:
> > +    items:
> > +      - description: MPU access base address
> > +      - description: L3 interconnect address
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  ti,hwmods:
> > +    $ref: /schemas/types.yaml#/definitions/string
> > +    enum: [mcpdm]
> > +    description: Name of the hwmod associated to the McPDM, likely "mcpdm"
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    items:
> > +      - const: pdmclk
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - ti,hwmods
> > +  - clocks
> > +  - clock-names
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    pdm@...32000 {
> 
> The original label and name is preferred to be used.

I imagine both were review comments. I can only imagine given the poor 
changelog.

Unused labels in examples should be dropped.

Node names should be generic. Though if we haven't defined the name in 
the spec or a schema, I don't care too much what is used.

> > +      compatible = "ti,omap4-mcpdm";
> > +      reg = <0x40132000 0x7f>, /* MPU private access */
> > +            <0x49032000 0x7f>; /* L3 Interconnect */
> > +      interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
> > +      interrupt-parent = <&gic>;
> > +      ti,hwmods = "mcpdm";
> > +      clocks = <&twl6040>;
> > +      clock-names = "pdmclk";
> 
> The clocks cannot be added at the time when the node is defined, it is
> board specific. This way you imply that it is OK to have it in main dtsi
> file. It is not.

That's a .dtsi structuring decision which is irrelevant to the 
binding.

Rob