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Date:   Wed, 11 Mar 2020 11:54:33 +0100
From:   Boris Brezillon <boris.brezillon@collabora.com>
To:     shiva.linuxworks@gmail.com
Cc:     Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Frieder Schrempf <frieder.schrempf@kontron.de>,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
        Shivamurthy Shastri <sshivamurthy@micron.com>
Subject: Re: [PATCH v6 6/6] mtd: spinand: micron: Add new Micron SPI NAND
 devices with multiple dies
Message-ID: <20200311115433.2360bea1@collabora.com>
In-Reply-To: <20200309115230.7207-7-sshivamurthy@micron.com>
References: <20200309115230.7207-1-sshivamurthy@micron.com>
        <20200309115230.7207-7-sshivamurthy@micron.com>
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On Mon,  9 Mar 2020 12:52:30 +0100
shiva.linuxworks@gmail.com wrote:

> From: Shivamurthy Shastri <sshivamurthy@micron.com>
> 
> Add device table for new Micron SPI NAND devices, which have multiple
> dies.
> 
> Also, enable support to select the dies.
> 
> Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>

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

> ---
>  drivers/mtd/nand/spi/micron.c | 55 +++++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
> index 9db1ab71fcae..f7d148aaa476 100644
> --- a/drivers/mtd/nand/spi/micron.c
> +++ b/drivers/mtd/nand/spi/micron.c
> @@ -20,6 +20,14 @@
>  
>  #define MICRON_CFG_CR			BIT(0)
>  
> +/*
> + * As per datasheet, die selection is done by the 6th bit of Die
> + * Select Register (Address 0xD0).
> + */
> +#define MICRON_DIE_SELECT_REG	0xD0
> +
> +#define MICRON_SELECT_DIE(x)	((x) << 6)
> +
>  static SPINAND_OP_VARIANTS(read_cache_variants,
>  		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
>  		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
> @@ -66,6 +74,20 @@ static const struct mtd_ooblayout_ops micron_8_ooblayout = {
>  	.free = micron_8_ooblayout_free,
>  };
>  
> +static int micron_select_target(struct spinand_device *spinand,
> +				unsigned int target)
> +{
> +	struct spi_mem_op op = SPINAND_SET_FEATURE_OP(MICRON_DIE_SELECT_REG,
> +						      spinand->scratchbuf);
> +
> +	if (target > 1)
> +		return -EINVAL;
> +
> +	*spinand->scratchbuf = MICRON_SELECT_DIE(target);
> +
> +	return spi_mem_exec_op(spinand->spimem, &op);
> +}
> +
>  static int micron_8_ecc_get_status(struct spinand_device *spinand,
>  				   u8 status)
>  {
> @@ -133,6 +155,17 @@ static const struct spinand_info micron_spinand_table[] = {
>  		     0,
>  		     SPINAND_ECCINFO(&micron_8_ooblayout,
>  				     micron_8_ecc_get_status)),
> +	/* M79A 4Gb 3.3V */
> +	SPINAND_INFO("MT29F4G01ADAGD", 0x36,
> +		     NAND_MEMORG(1, 2048, 128, 64, 2048, 80, 2, 1, 2),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     0,
> +		     SPINAND_ECCINFO(&micron_8_ooblayout,
> +				     micron_8_ecc_get_status),
> +		     SPINAND_SELECT_TARGET(micron_select_target)),
>  	/* M70A 4Gb 3.3V */
>  	SPINAND_INFO("MT29F4G01ABAFD", 0x34,
>  		     NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1),
> @@ -153,6 +186,28 @@ static const struct spinand_info micron_spinand_table[] = {
>  		     SPINAND_HAS_CR_FEAT_BIT,
>  		     SPINAND_ECCINFO(&micron_8_ooblayout,
>  				     micron_8_ecc_get_status)),
> +	/* M70A 8Gb 3.3V */
> +	SPINAND_INFO("MT29F8G01ADAFD", 0x46,
> +		     NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 2),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     SPINAND_HAS_CR_FEAT_BIT,
> +		     SPINAND_ECCINFO(&micron_8_ooblayout,
> +				     micron_8_ecc_get_status),
> +		     SPINAND_SELECT_TARGET(micron_select_target)),
> +	/* M70A 8Gb 1.8V */
> +	SPINAND_INFO("MT29F8G01ADBFD", 0x47,
> +		     NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 2),
> +		     NAND_ECCREQ(8, 512),
> +		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
> +					      &write_cache_variants,
> +					      &update_cache_variants),
> +		     SPINAND_HAS_CR_FEAT_BIT,
> +		     SPINAND_ECCINFO(&micron_8_ooblayout,
> +				     micron_8_ecc_get_status),
> +		     SPINAND_SELECT_TARGET(micron_select_target)),
>  };
>  
>  static int micron_spinand_detect(struct spinand_device *spinand)