linux-kernel - Re: [PATCH 2/2] leds: lm3692x: Introduce LM3692x dual string driver

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Date:   Wed, 15 Nov 2017 11:45:26 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, rpurdie@...ys.net,
        jacek.anaszewski@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH 2/2] leds: lm3692x: Introduce LM3692x dual string driver

On Mon 2017-11-13 14:50:52, Dan Murphy wrote:
> Introducing the LM3692x Dual-String white LED driver.
> 
> Data sheet is located
> http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>  drivers/leds/leds-lm3692x.c | 380 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 380 insertions(+)
>  create mode 100644 drivers/leds/leds-lm3692x.c
> 
> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
> new file mode 100644
> index 000000000000..beb753abc7b0
> --- /dev/null
> +++ b/drivers/leds/leds-lm3692x.c
> @@ -0,0 +1,380 @@
> +/*
> + * TI lm3692x LED Driver
> + *
> + * Copyright (C) 2017 Texas Instruments
> + *
> + * Author: Dan Murphy <dmurphy@...com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + */

I'd put data sheet link here.

> +/**
> + * struct lm3692x_led -
> + * @lock - Lock for reading/writing the device
> + * @client - Pointer to the I2C client
> + * @led_dev - led class device pointer
> + * @regmap - Devices register map
> + * @enable_gpio - VDDIO/EN gpio to enable communication interface
> + * @regulator - LED supply regulator pointer
> + * @label - LED label
> + **/

Are you sure this is linuxdoc? Would */ at the end be enough?

> +static int lm3692x_fault_check(struct lm3692x_led *led)
> +{
> +	int ret, fault;
> +	unsigned int read_buf;
> +
> +	ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
> +	if (ret)
> +		goto out;

Just return here.

> +	/*
> +	 * For glitch free operation, the following data should
> +	 * only be written while device enable bit is 0
> +	 * Per Section 7.5.14 of the data sheet
> +	 */

"per section 7.5.14 of the data sheet."

> +	ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
> +		LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ);
> +	if (ret)
> +		dev_err(&led->client->dev, "Failed programming PWM CTRL\n");
> +
> +	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
> +			LM3692X_BRHT_MODE_RAMP_MULTI |
> +			LM3692X_BL_ADJ_POL |
> +			LM3692X_RAMP_RATE_250us);
> +	if (ret)
> +		dev_err(&led->client->dev, "Failed programming BOOST CTRL\n");
> +
> +	ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00);
> +	if (ret)
> +		dev_err(&led->client->dev, "Failed programming AUTO HI FREQ\n");

If something fails, is it wise to continue?

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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