linux-kernel - Re: [RFC PATCH 1/9] leds: add TI LMU backlight driver

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Message-ID: <ee0185f0-1fc9-9176-2236-836ca0ac6f41@ti.com>
Date:   Wed, 26 Sep 2018 10:30:56 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <robh+dt@...nel.org>, <jacek.anaszewski@...il.com>, <pavel@....cz>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lee.jones@...aro.org>, <linux-omap@...r.kernel.org>,
        <linux-leds@...r.kernel.org>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: Re: [RFC PATCH 1/9] leds: add TI LMU backlight driver

Tony

On 09/26/2018 10:01 AM, Tony Lindgren wrote:
> * Dan Murphy <dmurphy@...com> [180926 13:14]:
>> --- /dev/null
>> +++ b/drivers/leds/ti-lmu-led-common.c
>> +static int ti_lmu_common_enable(struct ti_lmu_bank *lmu_bank, bool enable)
>> +{
>> +	struct regmap *regmap = lmu_bank->regmap;
>> +	unsigned long enable_time = lmu_bank->enable_usec;
>> +	u8 reg = lmu_bank->enable_reg;
>> +	u8 mask = BIT(lmu_bank->bank_id);
>> +	u8 val = (enable == true) ? mask : 0;
>> +	int ret;
>> +
>> +	return 0;
> 
> Hmm this early return probably needs to be left out on real hardawre?
> 

Yes it does.  I have not debugged or completed this function yet.

>> +	if (!reg)
>> +		return -EINVAL;
>> +
>> +	ret = regmap_update_bits(regmap, reg, mask, val);
>> +	if (ret)
>> +		return ret;
>> +
>> +	if (enable_time > 0)
>> +		usleep_range(enable_time, enable_time + 100);
>> +
>> +	return 0;
>> +}
> 
> Regards,
> 
> Tony
> 


-- 
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Dan Murphy