linux-kernel - Re: [PATCH v4 3/4] mtd: spi-nor: winbond: add OTP support to w25q32fw/jw

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Message-ID: <8e7147bb-a9ba-2b4b-abea-69e72ddd82f4@microchip.com>
Date:   Mon, 15 Mar 2021 08:26:11 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <michael@...le.cc>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>
Subject: Re: [PATCH v4 3/4] mtd: spi-nor: winbond: add OTP support to
 w25q32fw/jw

On 3/6/21 2:05 AM, Michael Walle wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> With all the helper functions in place, add OTP support for the Winbond
> W25Q32JW and W25Q32FW.
> 
> Both were tested on a LS1028A SoC with a NXP FSPI controller.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/mtd/spi-nor/winbond.c | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
> index e5dfa786f190..9a3f8ff007fd 100644
> --- a/drivers/mtd/spi-nor/winbond.c
> +++ b/drivers/mtd/spi-nor/winbond.c
> @@ -55,14 +55,18 @@ static const struct flash_info winbond_parts[] = {
>         { "w25q32", INFO(0xef4016, 0, 64 * 1024,  64, SECT_4K) },
>         { "w25q32dw", INFO(0xef6016, 0, 64 * 1024,  64,
>                            SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> -                          SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) },
> +                          SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> +                          OTP_INFO(256, 3, 0x1000, 0x1000)
> +       },
> +
>         { "w25q32jv", INFO(0xef7016, 0, 64 * 1024,  64,
>                            SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
>                            SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
>         },
>         { "w25q32jwm", INFO(0xef8016, 0, 64 * 1024,  64,
>                             SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> -                           SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) },
> +                           SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> +                           OTP_INFO(256, 3, 0x1000, 0x1000) },
>         { "w25q64jwm", INFO(0xef8017, 0, 64 * 1024, 128,
>                             SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
>                             SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) },
> @@ -131,9 +135,18 @@ static int winbond_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
>         return spi_nor_write_disable(nor);
>  }
> 
> +static const struct spi_nor_otp_ops winbond_otp_ops = {
> +       .read = spi_nor_otp_read_secr,
> +       .write = spi_nor_otp_write_secr,
> +       .lock = spi_nor_otp_lock_sr2,
> +       .is_locked = spi_nor_otp_is_locked_sr2,
> +};

Should we have this in otp.c? It can be shared with gigadevice as well
as far as I understood.

Cheers,
ta

> +
>  static void winbond_default_init(struct spi_nor *nor)
>  {
>         nor->params->set_4byte_addr_mode = winbond_set_4byte_addr_mode;
> +       if (nor->params->otp.org->n_regions)
> +               nor->params->otp.ops = &winbond_otp_ops;
>  }
> 
>  static const struct spi_nor_fixups winbond_fixups = {
> --
> 2.20.1
>