linux-kernel - Re: [PATCH v1 03/14] mtd: spi-nor: allow a flash to define its own ready() function

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Date:   Wed, 16 Feb 2022 00:06:53 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     <Tudor.Ambarus@...rochip.com>
CC:     <michael@...le.cc>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <vigneshr@...com>
Subject: Re: [PATCH v1 03/14] mtd: spi-nor: allow a flash to define its own
 ready() function

On 10/02/22 03:05AM, Tudor.Ambarus@...rochip.com wrote:
> On 2/2/22 16:58, Michael Walle wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > Xilinx and Micron flashes have their own implementation of the
> > spi_nor_ready() function. At the moment, the core will figure out
> > which one to call according to some flags. Lay the foundation to
> > make it possible that a flash can register its own ready()
> > function.
> > 
> > Signed-off-by: Michael Walle <michael@...le.cc>
> > ---
> >  drivers/mtd/spi-nor/core.c | 4 ++++
> >  drivers/mtd/spi-nor/core.h | 4 ++++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> > index c8cc906cf771..c181f2680df2 100644
> > --- a/drivers/mtd/spi-nor/core.c
> > +++ b/drivers/mtd/spi-nor/core.c
> > @@ -794,6 +794,10 @@ static int spi_nor_ready(struct spi_nor *nor)
> >  {
> >         int sr, fsr;
> > 
> > +       /* flashes might override our standard routine */
> 
> let's start comments with capital letter and put a dot at the end of
> the sentence. s/our/the

+1

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

With that fixed,

Reviewed-by: Pratyush Yadav <p.yadav@...com>

> > +       if (nor->params->ready)
> > +               return nor->params->ready(nor);
> > +
> >         if (nor->flags & SNOR_F_READY_XSR_RDY)
> >                 sr = spi_nor_xsr_ready(nor);
> >         else
> > diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> > index 10f478547dc2..446218b0e017 100644
> > --- a/drivers/mtd/spi-nor/core.h
> > +++ b/drivers/mtd/spi-nor/core.h
> > @@ -261,6 +261,9 @@ struct spi_nor_otp {
> >   *                     SPI NOR flashes that have peculiarities to the SPI NOR
> >   *                     standard e.g. different opcodes, specific address
> >   *                     calculation, page size, etc.
> > + * @ready:             (optional) flashes might use a different mechanism
> > + *                     than reading the status register to indicate they
> > + *                     are ready for a new command
> >   * @locking_ops:       SPI NOR locking methods.
> >   */
> >  struct spi_nor_flash_parameter {
> > @@ -282,6 +285,7 @@ struct spi_nor_flash_parameter {
> >         int (*set_4byte_addr_mode)(struct spi_nor *nor, bool enable);
> >         u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
> >         int (*setup)(struct spi_nor *nor, const struct spi_nor_hwcaps *hwcaps);
> > +       int (*ready)(struct spi_nor *nor);
> > 
> >         const struct spi_nor_locking_ops *locking_ops;
> >  };
> > --
> > 2.30.2
> > 
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.