linux-kernel - Re: [PATCH v4 2/4] mtd: spi-nor: otp: use more consistent wording

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Message-ID: <8ed3996d-78a5-a27f-978b-635b140ccee6@microchip.com>
Date:   Mon, 31 May 2021 08:28:28 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <michael@...le.cc>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <p.yadav@...com>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>
Subject: Re: [PATCH v4 2/4] mtd: spi-nor: otp: use more consistent wording

On 5/21/21 10:40 PM, Michael Walle wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Use the wording as used in the datasheet to describe the access methods
> of the security registers (aka OTP storage). This will also match the
> function names.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> Reviewed-by: Pratyush Yadav <p.yadav@...com>

Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

> ---
>  drivers/mtd/spi-nor/otp.c | 27 +++++++++++++++++++--------
>  1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/otp.c b/drivers/mtd/spi-nor/otp.c
> index 91a4c510ed51..3898ed67ba1c 100644
> --- a/drivers/mtd/spi-nor/otp.c
> +++ b/drivers/mtd/spi-nor/otp.c
> @@ -15,14 +15,21 @@
>  #define spi_nor_otp_n_regions(nor) ((nor)->params->otp.org->n_regions)
> 
>  /**
> - * spi_nor_otp_read_secr() - read OTP data
> + * spi_nor_otp_read_secr() - read security register
>   * @nor:       pointer to 'struct spi_nor'
>   * @addr:       offset to read from
>   * @len:        number of bytes to read
>   * @buf:        pointer to dst buffer
>   *
> - * Read OTP data from one region by using the SPINOR_OP_RSECR commands. This
> - * method is used on GigaDevice and Winbond flashes.
> + * Read a security register by using the SPINOR_OP_RSECR commands.
> + *
> + * In Winbond/GigaDevice datasheets the term "security register" stands for
> + * an one-time-programmable memory area, consisting of multiple bytes (usually
> + * 256). Thus one "security register" maps to one OTP region.
> + *
> + * This method is used on GigaDevice and Winbond flashes.
> + *
> + * Please note, the read must not span multiple registers.
>   *
>   * Return: number of bytes read successfully, -errno otherwise
>   */
> @@ -56,16 +63,20 @@ int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf)
>  }
> 
>  /**
> - * spi_nor_otp_write_secr() - write OTP data
> + * spi_nor_otp_write_secr() - write security register
>   * @nor:        pointer to 'struct spi_nor'
>   * @addr:       offset to write to
>   * @len:        number of bytes to write
>   * @buf:        pointer to src buffer
>   *
> - * Write OTP data to one region by using the SPINOR_OP_PSECR commands. This
> - * method is used on GigaDevice and Winbond flashes.
> + * Write a security register by using the SPINOR_OP_PSECR commands.
> + *
> + * For more information on the term "security register", see the documentation
> + * of spi_nor_otp_read_secr().
> + *
> + * This method is used on GigaDevice and Winbond flashes.
>   *
> - * Please note, the write must not span multiple OTP regions.
> + * Please note, the write must not span multiple registers.
>   *
>   * Return: number of bytes written successfully, -errno otherwise
>   */
> @@ -88,7 +99,7 @@ int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len,
> 
>         /*
>          * We only support a write to one single page. For now all winbond
> -        * flashes only have one page per OTP region.
> +        * flashes only have one page per security register.
>          */
>         ret = spi_nor_write_enable(nor);
>         if (ret)
> --
> 2.20.1
>