From: Grant Feng <von81@163.com>
To: von81@163.com, jacek.anaszewski@gmail.com, pavel@ucw.cz,
dmurphy@ti.com, robh+dt@kernel.org, linux-leds@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup
Date: Thu, 6 Aug 2020 14:21:29 +0800 [thread overview]
Message-ID: <20200806062130.25187-1-von81@163.com> (raw)
generate a 5ms low pulse on sdb pin when startup, then the chip
becomes more stable in the complex EM environment.
Signed-off-by: Grant Feng <von81@163.com>
---
drivers/leds/leds-is31fl319x.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/leds/leds-is31fl319x.c b/drivers/leds/leds-is31fl319x.c
index ca6634b8683c..b4f70002cec9 100644
--- a/drivers/leds/leds-is31fl319x.c
+++ b/drivers/leds/leds-is31fl319x.c
@@ -16,6 +16,8 @@
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
/* register numbers */
#define IS31FL319X_SHUTDOWN 0x00
@@ -61,6 +63,7 @@
struct is31fl319x_chip {
const struct is31fl319x_chipdef *cdef;
struct i2c_client *client;
+ struct gpio_desc *sdb_pin;
struct regmap *regmap;
struct mutex lock;
u32 audio_gain_db;
@@ -265,6 +268,15 @@ static int is31fl319x_parse_dt(struct device *dev,
is31->audio_gain_db = min(is31->audio_gain_db,
IS31FL319X_AUDIO_GAIN_DB_MAX);
+ is31->sdb_pin = gpiod_get(dev, "sdb", GPIOD_ASIS);
+ if (IS_ERR(is31->sdb_pin)) {
+ dev_warn(dev, "failed to get gpio_sdb, try default\r\n");
+ } else {
+ gpiod_direction_output(is31->sdb_pin, 0);
+ mdelay(5);
+ gpiod_direction_output(is31->sdb_pin, 1);
+ }
+
return 0;
put_child_node:
--
2.17.1
next reply other threads:[~2020-08-06 11:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-06 6:21 Grant Feng [this message]
2020-08-06 6:21 ` [PATCH 2/2] DT: leds: Add an optional property named 'sdb-gpios' Grant Feng
2020-08-06 15:00 ` [PATCH 1/2] leds: is31fl319x: Add sdb pin and generate a 5ms low pulse when startup Dan Murphy
2020-08-06 15:00 ` Dan Murphy
2020-08-06 19:08 ` Pavel Machek
2020-08-08 0:52 ` Grant Feng
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