linux-kernel - Re: [PATCH v2 2/2] leds: lp55xx: configure internal charge pump

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Date:   Fri, 20 Jan 2023 16:52:51 +0100
From:   Maarten Zanders <maarten.zanders@...d.be>
To:     Lee Jones <lee@...nel.org>
Cc:     Pavel Machek <pavel@....cz>, krzysztof.kozlowski@...aro.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] leds: lp55xx: configure internal charge pump


>>   
>> +	pdata->charge_pump_mode = LP55XX_CP_AUTO;
>> +	ret = of_property_read_string(np, "ti,charge-pump-mode", &pm);
>> +	if (!ret) {
>> +		for (cp_mode = LP55XX_CP_OFF;
>> +		     cp_mode < ARRAY_SIZE(charge_pump_modes);
>> +		     cp_mode++) {
>> +			if (!strcasecmp(pm, charge_pump_modes[cp_mode])) {
>> +				pdata->charge_pump_mode = cp_mode;
>> +				break;
>> +			}
>> +		}
>> +	}
> A little over-engineered, no?
>
> Why not make the property a numerical value, then simply:
>
>    ret = of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode);
>    if (ret)
>            data->charge_pump_mode = LP55XX_CP_AUTO;
>
> Elevates the requirement for the crumby indexed array of strings above.
>
> Remainder looks sane enough.

Thanks for your feedback.

I won't argue that your implementation isn't far more simple. The idea 
was to have an elaborate and clear and obvious devicetree, but that can 
also be achieved by moving constants into 
/includes/dt-bindings/leds/leds-lp55xx.h. Would that be more acceptable?

Maarten