linux-kernel - Re: [PATCH RESEND 06/16] mfd: add TI LMU driver

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Message-ID: <5653CD07.2090602@ti.com>
Date:	Tue, 24 Nov 2015 11:35:51 +0900
From:	"Kim, Milo" <milo.kim@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jingoo Han <jingoohan1@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Mark Brown <broonie@...nel.org>, <lm-sensors@...sensors.org>,
	<linux-leds@...r.kernel.org>
Subject: Re: [PATCH RESEND 06/16] mfd: add TI LMU driver

Hi Lee,

Thanks for all your comments. Please see my comments below.

On 11/23/2015 7:30 PM, Lee Jones wrote:
>> +int ti_lmu_read_byte(struct ti_lmu *lmu, u8 reg, u8 *read)
>> >+{
>> >+	int ret;
>> >+	unsigned int val;
>> >+
>> >+	ret = regmap_read(lmu->regmap, reg, &val);
>> >+	if (ret < 0)
>> >+		return ret;
>> >+
>> >+	*read = (u8)val;
>> >+	return 0;
>> >+}
>> >+EXPORT_SYMBOL_GPL(ti_lmu_read_byte);
> It doesn't get much more simple than this.
>
> What's the purpose of abstracting it?
>
>> >+int ti_lmu_write_byte(struct ti_lmu *lmu, u8 reg, u8 data)
>> >+{
>> >+	return regmap_write(lmu->regmap, reg, data);
>> >+}
>> >+EXPORT_SYMBOL_GPL(ti_lmu_write_byte);
>> >+
>> >+int ti_lmu_update_bits(struct ti_lmu *lmu, u8 reg, u8 mask, u8 data)
>> >+{
>> >+	return regmap_update_bits(lmu->regmap, reg, mask, data);
>> >+}
>> >+EXPORT_SYMBOL_GPL(ti_lmu_update_bits);
> Okay, I lied, it does get more simple.
>
> Seems like abstraction for the sake of abstraction here.
>
> Feel free to try and convince me otherwise.
>

The main reason was that LMU MFD core provides consistent register 
access among LMU drivers like ti-lmu-backlight, leds-lm3633, 
lm363x-regulator and ti-lmu-fault-monitor('ti-lmu-hwmon' will be changed 
to this in the 2nd patch).

However, LMU register helpers are exactly same as regmap interface 
except using ti_lmu data structure. So let me replace them with regmap 
functions. Thanks for pointing this out.

Best regards,
Milo
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