Re: [PATCH v6 04/18] mtd: rawnand: Create a helper to retrieve the ECC placement

From: Boris Brezillon <boris.brezillon@collabora.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, Vignesh Raghavendra <vigneshr@ti.com>,
	Tudor Ambarus <Tudor.Ambarus@microchip.com>,
	Julien Su <juliensu@mxic.com.tw>,
	Richard Weinberger <richard@nod.at>,
	Weijie Gao <weijie.gao@mediatek.com>,
	Paul Cercueil <paul@crapouillou.net>,
	Rob Herring <robh+dt@kernel.org>,
	linux-mtd@lists.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Mason Yang <masonccyang@mxic.com.tw>,
	Chuanhong Guo <gch981213@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 04/18] mtd: rawnand: Create a helper to retrieve the ECC placement
Date: Thu, 28 May 2020 16:22:44 +0200	[thread overview]
Message-ID: <20200528162244.7f1c6c50@collabora.com> (raw)
In-Reply-To: <20200528113113.9166-5-miquel.raynal@bootlin.com>

On Thu, 28 May 2020 13:30:59 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Use it from nand_dt_init() to initialize the ECC structure.
> 
> This allows the deprecation of the hw_syndrome ECC mode.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

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

> ---
>  drivers/mtd/nand/raw/nand_base.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 9fbd2a474b62..fd0bfe9bf7ae 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -5047,6 +5047,34 @@ static int of_get_nand_ecc_mode(struct device_node *np)
>  	return -ENODEV;
>  }
>  
> +enum nand_ecc_placement of_get_nand_ecc_placement(struct device_node *np)
> +{
> +	enum nand_ecc_placement placement;
> +	const char *pm;
> +	int err;
> +
> +	err = of_property_read_string(np, "nand-ecc-placement", &pm);
> +	if (!err) {
> +		for (placement = NAND_ECC_PLACEMENT_INTERLEAVED;
> +		     placement < ARRAY_SIZE(nand_ecc_placement); placement++) {
> +			if (!strcasecmp(pm, nand_ecc_placement[placement]))
> +				return placement;
> +		}
> +	}
> +
> +	/*
> +	 * For backward compatibility we support few obsoleted values that don't
> +	 * have their mappings into the nand_ecc_placement enum anymore.
> +	 */
> +	err = of_property_read_string(np, "nand-ecc-mode", &pm);
> +	if (!err) {
> +		if (!strcasecmp(pm, "hw_syndrome"))
> +			return NAND_ECC_PLACEMENT_INTERLEAVED;
> +	}
> +
> +	return NAND_ECC_PLACEMENT_UNKNOWN;
> +}
> +
>  static const char * const nand_ecc_algos[] = {
>  	[NAND_ECC_HAMMING]	= "hamming",
>  	[NAND_ECC_BCH]		= "bch",
> @@ -5143,6 +5171,7 @@ static int nand_dt_init(struct nand_chip *chip)
>  
>  	ecc_mode = of_get_nand_ecc_mode(dn);
>  	ecc_algo = of_get_nand_ecc_algo(dn);
> +	chip->ecc.placement = of_get_nand_ecc_placement(dn);
>  	ecc_strength = of_get_nand_ecc_strength(dn);
>  	ecc_step = of_get_nand_ecc_step_size(dn);
>  


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