Fri, 5 Sep 2014 18:07:36 +0200 от Gregory Hermant <gregory.hermant@xxxxxxxxxxxxxxxxx>:
> This patch allows to read the REV_ID register in SPI mode and consequently
> to properly detect the max3109. Indeed in SPI mode, this register is only
> accessible by using indirect addressing.
>
> Signed-off-by: Gregory Hermant <gregory.hermant@xxxxxxxxxxxxxxxxx>
> ---
> drivers/tty/serial/max310x.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
> index 5183643..2d911f6 100644
> --- a/drivers/tty/serial/max310x.c
> +++ b/drivers/tty/serial/max310x.c
> @@ -369,10 +369,13 @@ static int max3109_detect(struct device *dev)
> unsigned int val = 0;
> int ret;
>
> - ret = regmap_read(s->regmap, MAX310X_REVID_REG, &val);
> + ret = regmap_write(s->regmap, MAX310X_GLOBALCMD_REG,
> + MAX310X_EXTREG_ENBL);
> if (ret)
> return ret;
> -
> +
> + regmap_read(s->regmap, MAX310X_REVID_EXTREG, &val);
> + regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, MAX310X_EXTREG_DSBL);
> if (((val & MAX310x_REV_MASK) != MAX3109_REV_ID)) {
> dev_err(dev,
> "%s ID 0x%02x does not match\n", s->devtype->name, val);
> --
Reviewed-by: Alexander Shiyan <shc_work@xxxxxxx>
---
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