Re: [PATCH] power: supply: bd71828: sysfs for auto input current limitation

[Matti Vaittinen]

Thanks Andreas!

On 04/05/2026 19:40, Andreas Kemnade wrote:
> Add the possibility to disable the auto adjustment for input current
> limitation via sysfs because it gives strange results under certain
> circumstances e.g. when powering the device with solar panels
> resulting in no input power usage at all.
>
> Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
Reviewed-by: Matti Vaittinen <mazziesaccount@xxxxxxxxx>

> ---
>   .../ABI/testing/sysfs-class-power-bd71828     | 12 ++++
>   drivers/power/supply/bd71828-power.c          | 69 ++++++++++++++++++-
>   2 files changed, 80 insertions(+), 1 deletion(-)
>   create mode 100644 Documentation/ABI/testing/sysfs-class-power-bd71828

// snip

> +static ssize_t auto_dcin_limit_store(struct device *dev,
> +				     struct device_attribute *attr,
> +				     const char *buf, size_t len)
> +{
> +	struct bd71828_power *pwr = dev_get_drvdata(dev->parent);
> +	int ret;
> +	bool v;
> +
> +	ret = kstrtobool(buf, &v);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = regmap_update_bits(pwr->regmap, BD71828_REG_DCIN_SET,
> +				 BD71828_MASK_ILIM_DCIN_EN,
> +				 v ? BD71828_MASK_ILIM_DCIN_EN : 0);

'nit'. I am not a big fan of the ternary. I would consider using an 
if-else or the regmap_assign_bits(). Not worth re-spinning though.


> +static bool bd71828_ac_sysfs_group_visible(struct kobject *kobj)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct bd71828_power *pwr = dev_get_drvdata(dev->parent);
> +
> +	return !!pwr->regs->dcin_set;
> +}
> +
> +DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(bd71828_ac_sysfs);

Ah. I didn't know DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE() existed. Thanks 
for teaching me a thing again :)

Yours,
	-- Matti
--
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

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