linux-kernel - Re: [PATCH 1/3] mtd: spi-nor: core: Add helpers to read/write any register

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Message-ID: <2e40f311-d04a-899b-acef-a8194006d8cf@gmail.com>
Date:   Mon, 21 Feb 2022 16:40:56 +0900
From:   Takahiro Kuwano <tkuw584924@...il.com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>, p.yadav@...com,
        michael@...le.cc, Takahiro.Kuwano@...ineon.com
Cc:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        nicolas.ferre@...rochip.com, zhengxunli@...c.com.tw,
        jaimeliao@...c.com.tw, Bacem.Daassi@...ineon.com
Subject: Re: [PATCH 1/3] mtd: spi-nor: core: Add helpers to read/write any
 register

On 2/10/2022 11:33 AM, Tudor Ambarus wrote:
> There are manufacturers that use registers indexed by address. Some of
> them support "read/write any register" opcodes. Provide core methods that
> can be used by all manufacturers. SPI NOR controller ops are intentionally
> not supported as we intend to move all the SPI NOR controller drivers
> under the SPI subsystem.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/spi-nor/core.c | 41 ++++++++++++++++++++++++++++++++++++++
>  drivers/mtd/spi-nor/core.h |  4 ++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 7d5e3acb0ae7..d394179689e6 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -307,6 +307,47 @@ ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
>  	return nor->controller_ops->write(nor, to, len, buf);
>  }
>  
> +/**
> + * spi_nor_read_reg() - read register to flash memory
> + * @nor:        pointer to 'struct spi_nor'.
> + * @op:		SPI memory operation. op->data.buf must be DMA-able.
> + * @proto:	SPI protocol to use for the register operation.
> + *
> + * Return: zero on success, -errno otherwise
> + */
> +int spi_nor_read_reg(struct spi_nor *nor, struct spi_mem_op *op,
> +		     enum spi_nor_protocol proto)
> +{
> +	if (!nor->spimem)
> +		return -EOPNOTSUPP;
> +
> +	spi_nor_spimem_setup_op(nor, op, proto);
> +	return spi_nor_spimem_exec_op(nor, op);
> +}
> +
> +/**
> + * spi_nor_write_reg() - write register to flash memory
> + * @nor:        pointer to 'struct spi_nor'
> + * @op:		SPI memory operation. op->data.buf must be DMA-able.
> + * @proto:	SPI protocol to use for the register operation.
> + *
> + * Return: zero on success, -errno otherwise
> + */
> +int spi_nor_write_reg(struct spi_nor *nor, struct spi_mem_op *op,
> +		      enum spi_nor_protocol proto)
> +{
> +	int ret;
> +
> +	if (!nor->spimem)
> +		return -EOPNOTSUPP;
> +
> +	ret = spi_nor_write_enable(nor);
> +	if (ret)
> +		return ret;
> +	spi_nor_spimem_setup_op(nor, op, proto);
> +	return spi_nor_spimem_exec_op(nor, op);
> +}
> +
>  /**
>   * spi_nor_write_enable() - Set write enable latch with Write Enable command.
>   * @nor:	pointer to 'struct spi_nor'.
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index cbfb4fa7647f..c728454b5424 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -578,6 +578,10 @@ ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
>  			  u8 *buf);
>  ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
>  			   const u8 *buf);
> +int spi_nor_read_reg(struct spi_nor *nor, struct spi_mem_op *op,
> +		     enum spi_nor_protocol proto);
> +int spi_nor_write_reg(struct spi_nor *nor, struct spi_mem_op *op,
> +		      enum spi_nor_protocol proto);
>  int spi_nor_erase_sector(struct spi_nor *nor, u32 addr);
>  
>  int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf);

Thank you for introducing these helpers.
I revised my S25HL/HS-T series on top of this and confirmed that is
working correctly.

Tested-By: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>

Best Regards,
Takahiro