[PATCH 1/1] mtd: devices: m25p80: Add PM suspend resume support

[Geert Uytterhoeven]

On Fri, Sep 9, 2016 at 9:13 PM, Kamal Dasu <kdasu.kdev at gmail.com> wrote:
> Adding PM support so as to be able to probe spi-nor flash
> on resume. There are vendor specific commands to setup
> the transfer mode and enable read/write as part of
> spi_nor_scan(), done on intial probe and needed on resume().
> The spi-nor stucture is private to the m25p driver and hence
> is the only place this can be done without having to duplicate
> code in controller driver.
>
> Signed-off-by: Kamal Dasu <kdasu.kdev at gmail.com>
> ---
>  drivers/mtd/devices/m25p80.c | 37 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index 9cf7fcd..f8294b4 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c

> +static int m25p_resume(struct device *dev)
> +{
> +       struct m25p *flash = dev_get_drvdata(dev);
> +       struct flash_platform_data      *data;
> +       char *flash_name = NULL;
> +       enum read_mode mode = SPI_NOR_NORMAL;
> +       int ret;
> +
> +       data = dev_get_platdata(&flash->spi->dev);
> +
> +       if (data && data->type)
> +               flash_name = data->type;
> +       else if (!strcmp(flash->spi->modalias, "spi-nor"))
> +               flash_name = NULL; /* auto-detect */
> +       else
> +               flash_name = flash->spi->modalias;
> +
> +       if (flash->spi->mode & SPI_RX_QUAD)
> +               mode = SPI_NOR_QUAD;
> +       else if (flash->spi->mode & SPI_RX_DUAL)
> +               mode = SPI_NOR_DUAL;
> +
> +       ret = spi_nor_scan(&flash->spi_nor, flash_name, mode);

All of the above is also done in m25p_probe(). Hence please factor out the
commonalities into its own function.

> +
> +       return ret;
> +}

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds