linux-kernel - Re: [PATCH v5 6/6] dt-bindings: mmc: Document support for partition table in mmc-card

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Message-ID: <CACRpkdZ=QLcqNrynWrWn0oRxjBpqWDko8rw95idEWvyfw+xEOA@mail.gmail.com>
Date: Wed, 2 Oct 2024 16:01:35 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>, 
	Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	INAGAKI Hiroshi <musashino.open@...il.com>, Daniel Golle <daniel@...rotopia.org>, 
	Christian Brauner <brauner@...nel.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Ming Lei <ming.lei@...hat.com>, Jan Kara <jack@...e.cz>, Li Lingfeng <lilingfeng3@...wei.com>, 
	Christian Heusel <christian@...sel.eu>, Avri Altman <avri.altman@....com>, 
	Adrian Hunter <adrian.hunter@...el.com>, Mikko Rapeli <mikko.rapeli@...aro.org>, 
	Riyan Dhiman <riyandhiman14@...il.com>, Jorge Ramirez-Ortiz <jorge@...ndries.io>, 
	Dominique Martinet <dominique.martinet@...ark-techno.com>, 
	Jens Wiklander <jens.wiklander@...aro.org>, 
	Christophe JAILLET <christophe.jaillet@...adoo.fr>, Li Zhijian <lizhijian@...itsu.com>, 
	linux-block@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org, 
	devicetree@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, upstream@...oha.com
Subject: Re: [PATCH v5 6/6] dt-bindings: mmc: Document support for partition
 table in mmc-card

On Wed, Oct 2, 2024 at 12:20 AM Christian Marangi <ansuelsmth@...il.com> wrote:

> Document support for defining a partition table in the mmc-card node.
>
> This is needed if the eMMC doesn't have a partition table written and
> the bootloader of the device load data by using absolute offset of the
> block device. This is common on embedded device that have eMMC installed
> to save space and have non removable block devices.
>
> If an OF partition table is detected, any partition table written in the
> eMMC will be ignored and won't be parsed.
>
> eMMC provide a generic disk for user data and if supported (JEDEC 4.4+)
> also provide two additional disk ("boot1" and "boot2") for special usage
> of boot operation where normally is stored the bootloader or boot info.
> New JEDEC version also supports up to 4 GP partition for other usage
> called "gp1", "gp2", "gp3", "gp4".
>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij