linux-kernel - Re: [PATCH v4 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

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Message-ID: <ZoUb_olfaVapoYBi@shikoro>
Date: Wed, 3 Jul 2024 11:38:06 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>, linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v4 1/3] dt-bindings: mmc: renesas,sdhi: Document
 RZ/V2H(P) support

On Wed, Jun 26, 2024 at 02:23:39PM +0100, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> of the R-Car Gen3, but it has some differences:
> - HS400 is not supported.
> - It supports the SD_IOVS bit to control the IO voltage level.
> - It supports fixed address mode.
> 
> To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> compatible string is added.
> 
> A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
> and voltage level switching for the SD/MMC.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Can we have an example here? I can read DTS snippets better than YAML
code :/ Also wondering about the "regulator-compatible" property but
maybe the example makes the problem clear?


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