linux-kernel - Re: [PATCH v4 4/5] mfd: rn5t618: add more subdevices

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Message-ID: <20191216153106.GK2369@dell>
Date:   Mon, 16 Dec 2019 15:31:06 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     robh+dt@...nel.org, mark.rutland@....com, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        stefan@...er.ch, b.galvani@...il.com, phh@....me,
        letux-kernel@...nphoenux.org
Subject: Re: [PATCH v4 4/5] mfd: rn5t618: add more subdevices

On Wed, 11 Dec 2019, Andreas Kemnade wrote:

> The RC5T619 has a RTC which is missing in the
> RN5T618. Add it as subdevice to prepare for their implementation
> 
> Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> ---
> Changes in v3:
> - alignment cleanup
>  drivers/mfd/rn5t618.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
> index d78eb29b94a4..18d56a732b20 100644
> --- a/drivers/mfd/rn5t618.c
> +++ b/drivers/mfd/rn5t618.c
> @@ -22,6 +22,12 @@ static const struct mfd_cell rn5t618_cells[] = {
>  	{ .name = "rn5t618-wdt" },
>  };
>  
> +static const struct mfd_cell rc5t619_cells[] = {
> +	{ .name = "rn5t618-regulator" },
> +	{ .name = "rc5t619-rtc" },
> +	{ .name = "rn5t618-wdt" },
> +};
> +
>  static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
>  {
>  	switch (reg) {
> @@ -173,8 +179,14 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
>  		return ret;
>  	}
>  
> -	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
> -				   ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
> +	if (priv->variant == RC5T619)
> +		ret = devm_mfd_add_devices(&i2c->dev, -1, rc5t619_cells,

Ref: The "-1", please use this as an opportunity to use the defines.

> +					   ARRAY_SIZE(rc5t619_cells),
> +					   NULL, 0, NULL);
> +	else

Are you sure it's not possible for 'variant' to be an unsupported
device?

> +		ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
> +					   ARRAY_SIZE(rn5t618_cells),
> +					   NULL, 0, NULL);
>  	if (ret) {
>  		dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
>  		return ret;

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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