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From: Boris Brezillon <boris.brezillon@bootlin.com>
To: Stefan Agner <stefan@agner.ch>
Cc: dwmw2@infradead.org, computersforpeace@gmail.com,
	marek.vasut@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com,
	thierry.reding@gmail.com, benjamin.lindqvist@endian.se,
	pgaikwad@nvidia.com, dev@lynxeye.de, mirza.krak@gmail.com,
	richard@nod.at, pdeschrijver@nvidia.com,
	linux-kernel@vger.kernel.org, krzk@kernel.org,
	jonathanh@nvidia.com, devicetree@vger.kernel.org,
	linux-mtd@lists.infradead.org, marcel@ziswiler.com,
	miquel.raynal@bootlin.com, linux-tegra@vger.kernel.org,
	digetx@gmail.com
Subject: Re: [PATCH v3 2/6] mtd: rawnand: add an option to specify NAND chip as a boot device
Date: Fri, 1 Jun 2018 09:26:52 +0200	[thread overview]
Message-ID: <20180601092652.2e9716ac@bbrezillon> (raw)
In-Reply-To: <20180531221637.6017-3-stefan@agner.ch>

On Fri,  1 Jun 2018 00:16:33 +0200
Stefan Agner <stefan@agner.ch> wrote:

> Allow to define a NAND chip as a boot device. This can be helpful
> for the selection of the ECC algorithm and strength in case the boot
> ROM supports only a subset of controller provided options.
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>

Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>

> ---
>  Documentation/devicetree/bindings/mtd/nand.txt | 4 ++++
>  drivers/mtd/nand/raw/nand_base.c               | 3 +++
>  include/linux/mtd/rawnand.h                    | 6 ++++++
>  3 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/nand.txt b/Documentation/devicetree/bindings/mtd/nand.txt
> index 8bb11d809429..8daf81b9748c 100644
> --- a/Documentation/devicetree/bindings/mtd/nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/nand.txt
> @@ -43,6 +43,10 @@ Optional NAND chip properties:
>  		     This is particularly useful when only the in-band area is
>  		     used by the upper layers, and you want to make your NAND
>  		     as reliable as possible.
> +- nand-is-boot-medium: Whether the NAND chip is a boot medium. Drivers might use
> +		       this information to select ECC algorithms supported by
> +		       the boot ROM or similar restrictions.
> +
>  - nand-rb: shall contain the native Ready/Busy ids.
>  
>  The ECC strength and ECC step size properties define the correction capability
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 9eb5678dd6d0..c8fb7c9855e2 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -5826,6 +5826,9 @@ static int nand_dt_init(struct nand_chip *chip)
>  	if (of_get_nand_bus_width(dn) == 16)
>  		chip->options |= NAND_BUSWIDTH_16;
>  
> +	if (of_property_read_bool(dn, "nand-is-boot-medium"))
> +		chip->options |= NAND_IS_BOOT_MEDIUM;
> +
>  	if (of_get_nand_on_flash_bbt(dn))
>  		chip->bbt_options |= NAND_BBT_USE_FLASH;
>  
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index 6a82da8c44ce..8e54fcf2fa94 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -212,6 +212,12 @@ enum nand_ecc_algo {
>   */
>  #define NAND_WAIT_TCCS		0x00200000
>  
> +/*
> + * Whether the NAND chip is a boot medium. Drivers might use this information
> + * to select ECC algorithms supported by the boot ROM or similar restrictions.
> + */
> +#define NAND_IS_BOOT_MEDIUM	0x00400000
> +
>  /* Options set by nand scan */
>  /* Nand scan has allocated controller struct */
>  #define NAND_CONTROLLER_ALLOC	0x80000000

  reply	other threads:[~2018-06-01  7:26 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-31 22:16 [PATCH v3 0/6] mtd: rawnand: add NVIDIA Tegra NAND flash support Stefan Agner
2018-05-31 22:16 ` [PATCH v3 1/6] mtd: rawnand: add Reed-Solomon error correction algorithm Stefan Agner
2018-06-01  7:26   ` Boris Brezillon
2018-06-01  9:25     ` Boris Brezillon
2018-06-01 13:34       ` Stefan Agner
2018-06-01 13:43         ` Boris Brezillon
2018-05-31 22:16 ` [PATCH v3 2/6] mtd: rawnand: add an option to specify NAND chip as a boot device Stefan Agner
2018-06-01  7:26   ` Boris Brezillon [this message]
2018-06-05 20:11   ` Rob Herring
2018-06-06  7:28     ` Boris Brezillon
2018-05-31 22:16 ` [PATCH v3 3/6] mtd: rawnand: tegra: add devicetree binding Stefan Agner
2018-06-01  7:30   ` Boris Brezillon
2018-06-05 20:19     ` Dmitry Osipenko
2018-06-06 10:39       ` Thierry Reding
2018-06-06 10:45         ` Boris Brezillon
2018-06-06 11:07           ` Thierry Reding
2018-06-06 12:14             ` Stefan Agner
2018-06-06 12:31               ` Boris Brezillon
2018-06-05 20:13   ` Rob Herring
2018-05-31 22:16 ` [PATCH v3 4/6] mtd: rawnand: add NVIDIA Tegra NAND Flash controller driver Stefan Agner
2018-06-01  9:20   ` Dmitry Osipenko
2018-06-08 21:51     ` Stefan Agner
2018-06-09  5:52       ` Boris Brezillon
2018-06-09  6:23         ` Stefan Agner
2018-06-09  6:41           ` Boris Brezillon
2018-06-09  6:46             ` Boris Brezillon
2018-06-09  6:55               ` Boris Brezillon
2018-06-09  6:51             ` Stefan Agner
2018-06-09 12:21       ` Dmitry Osipenko
2018-06-10 11:09         ` Stefan Agner
2018-06-10 15:00           ` Dmitry Osipenko
2018-06-10 15:32             ` Boris Brezillon
2018-06-11 11:45               ` Dmitry Osipenko
2018-06-11 11:50                 ` Boris Brezillon
2018-06-11 13:10                   ` Dmitry Osipenko
2018-06-04 17:16   ` Randolph Maaßen
2018-06-04 20:56     ` Stefan Agner
2018-06-09  5:55   ` Boris Brezillon
2018-06-09  7:18   ` Boris Brezillon
2018-05-31 22:16 ` [PATCH v3 5/6] ARM: dts: tegra: add Tegra20 NAND flash controller node Stefan Agner
2018-05-31 22:16 ` [PATCH v3 6/6] ARM: dts: tegra: enable NAND flash on Colibri T20 Stefan Agner

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