linux-kernel - [PATCH v3 4/9] leds: lm3692x: Allow to configure brigthness mode

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Message-Id: <f70e4ba49de8379c50cd3770e6d8d36d783282df.1578134779.git.agx@sigxcpu.org>
Date:   Sat,  4 Jan 2020 11:54:20 +0100
From:   Guido Günther <agx@...xcpu.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        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: [PATCH v3 4/9] leds: lm3692x: Allow to configure brigthness mode

Brightness mode is currently hardcoded as linear in the driver. Make
exponential mode configurable via DT.

Signed-off-by: Guido Günther <agx@...xcpu.org>
---
 drivers/leds/leds-lm3692x.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
index 28973cc5a6cc..ff20560a8263 100644
--- a/drivers/leds/leds-lm3692x.c
+++ b/drivers/leds/leds-lm3692x.c
@@ -115,7 +115,7 @@ struct lm3692x_led {
 	int led_enable;
 	int model_id;
 
-	u8 boost_ctrl;
+	u8 boost_ctrl, brightness_ctrl;
 };
 
 static const struct reg_default lm3692x_reg_defs[] = {
@@ -267,8 +267,7 @@ 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;
 
@@ -326,6 +325,7 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 	struct fwnode_handle *child = NULL;
 	struct led_init_data init_data = {};
 	u32 ovp;
+	bool exp_mode;
 	int ret;
 
 	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
@@ -376,6 +376,12 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
 		}
 	}
 
+	led->brightness_ctrl = LM3692X_BL_ADJ_POL | LM3692X_RAMP_EN;
+	exp_mode = device_property_read_bool(&led->client->dev,
+				     "ti,brightness-mapping-exponential");
+	if (exp_mode)
+		led->brightness_ctrl |= LM3692X_MAP_MODE_EXP;
+
 	child = device_get_next_child_node(&led->client->dev, child);
 	if (!child) {
 		dev_err(&led->client->dev, "No LED Child node\n");
-- 
2.23.0