linux-kernel - Re: [PATCH 2/2] leds: lm3692x: Allow to set ovp and brigthness mode

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Date:   Tue, 17 Dec 2019 06:53:45 -0600
From:   Dan Murphy <dmurphy@...com>
To:     Guido Günther <agx@...xcpu.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] leds: lm3692x: Allow to set ovp and brigthness mode

Guido

On 12/16/19 6:28 AM, Guido Günther wrote:
> Overvoltage protection and brightness mode are currently hardcoded
> as disabled in the driver. Make these configurable via DT.

Can we split these up to two separate patch series?

We are adding 2 separate features and if something is incorrect with one 
of the changes it is a bit hard to debug.

>
> Signed-off-by: Guido Günther <agx@...xcpu.org>
> ---
>   drivers/leds/leds-lm3692x.c | 43 +++++++++++++++++++++++++++++++------
>   1 file changed, 37 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
> index 8b408102e138..2c084b333628 100644
> --- a/drivers/leds/leds-lm3692x.c
> +++ b/drivers/leds/leds-lm3692x.c
> @@ -114,6 +114,7 @@ struct lm3692x_led {
>   	struct regulator *regulator;
>   	int led_enable;
>   	int model_id;
> +	u8 boost_ctrl, brightness_ctrl;
>   };
>   
>   static const struct reg_default lm3692x_reg_defs[] = {
> @@ -249,10 +250,7 @@ static int lm3692x_init(struct lm3692x_led *led)
>   	if (ret)
>   		goto out;
>   
> -	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
> -			LM3692X_BOOST_SW_1MHZ |
> -			LM3692X_BOOST_SW_NO_SHIFT |
> -			LM3692X_OCP_PROT_1_5A);
> +	ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, led->boost_ctrl);
>   	if (ret)
>   		goto out;

regmap_update_bits


>   
> @@ -268,8 +266,7 @@ static int lm3692x_init(struct lm3692x_led *led)
>   	if (ret)
>   		goto out;
>   
> -	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,
> -			LM3692X_BL_ADJ_POL | LM3692X_RAMP_EN);
> +	ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, led->brightness_ctrl);
>   	if (ret)
>   		goto out;
regmap_update_bits
>   
> @@ -326,6 +323,8 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>   {
>   	struct fwnode_handle *child = NULL;
>   	struct led_init_data init_data = {};
> +	u32 ovp = 0;
> +	bool exp_mode;
>   	int ret;
>   
>   	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
> @@ -350,6 +349,38 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>   		led->regulator = NULL;
>   	}
>   
> +	led->boost_ctrl = LM3692X_BOOST_SW_1MHZ |
> +		LM3692X_BOOST_SW_NO_SHIFT |
> +		LM3692X_OCP_PROT_1_5A;
Make this a #define and then it can be reused as a mask for 
regmap_update_bits
> +	ret = device_property_read_u32(&led->client->dev,
> +				       "ti,overvoltage-volts", &ovp);
> +	if (!ret) {

if (ret)

     set boost_ctrl to default value since the default is not 0

led->boost_ctrl |= LM3692X_OVP_29V;

else

      do case

> +		switch (ovp) {
> +		case 0:
> +			break;
> +		case 22:
If the value is 21v why is this case 22?  DT binding says 21 is the 
first value
> +			led->boost_ctrl |= LM3692X_OVP_21V;
> +			break;
> +		case 25:
> +			led->boost_ctrl |= LM3692X_OVP_25V;
> +			break;
> +		case 29:
> +			led->boost_ctrl |= LM3692X_OVP_29V;
> +			break;
> +		default:
> +			dev_err(&led->client->dev, "Invalid OVP %d\n", ovp);
> +			return -EINVAL;
> +		}
> +	}
> +	dev_dbg(&led->client->dev, "OVP: %dV", ovp);
> +
extra debug statement
> +	led->brightness_ctrl = LM3692X_BL_ADJ_POL | LM3692X_RAMP_EN;
Same comment as before on the #define
> +	exp_mode = device_property_read_bool(&led->client->dev,
> +				     "ti,brightness-mapping-exponential");
> +	dev_dbg(&led->client->dev, "Exponential brightness: %d", exp_mode);

extra debug statement

Dan