lkml.org 
[lkml]   [2010]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH] regulator: Add 'start-up time' to fixed voltage regulators
From bd97e65b280be528239e3932da8be512ce7785ed Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@nokia.com>
Date: Tue, 12 Jan 2010 12:25:13 +0200
Subject: [PATCH] regulator: Add 'start-up time' to fixed voltage regulators

Add a field to specify a delay for the start-up time of
a fixed voltage regulator.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
---
drivers/regulator/fixed.c | 5 +++++
include/linux/regulator/fixed.h | 2 ++
2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index f9f516a..40d4080 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -24,12 +24,14 @@
#include <linux/regulator/driver.h>
#include <linux/regulator/fixed.h>
#include <linux/gpio.h>
+#include <linux/delay.h>

struct fixed_voltage_data {
struct regulator_desc desc;
struct regulator_dev *dev;
int microvolts;
int gpio;
+ unsigned startup_delay;
unsigned enable_high:1;
unsigned is_enabled:1;
};
@@ -48,6 +50,8 @@ static int fixed_voltage_enable(struct regulator_dev *dev)
if (gpio_is_valid(data->gpio)) {
gpio_set_value_cansleep(data->gpio, data->enable_high);
data->is_enabled = 1;
+ if (data->startup_delay)
+ udelay(data->startup_delay);
}

return 0;
@@ -117,6 +121,7 @@ static int regulator_fixed_voltage_probe(struct platform_device *pdev)

drvdata->microvolts = config->microvolts;
drvdata->gpio = config->gpio;
+ drvdata->startup_delay = config->startup_delay;

if (gpio_is_valid(config->gpio)) {
drvdata->enable_high = config->enable_high;
diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index e94a4a1..02edef1 100644
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -25,6 +25,7 @@ struct regulator_init_data;
* @microvolts: Output voltage of regulator
* @gpio: GPIO to use for enable control
* set to -EINVAL if not used
+ * @startup_delay: Start-up time in microseconds
* @enable_high: Polarity of enable GPIO
* 1 = Active high, 0 = Active low
* @enabled_at_boot: Whether regulator has been enabled at
@@ -41,6 +42,7 @@ struct fixed_voltage_config {
const char *supply_name;
int microvolts;
int gpio;
+ unsigned startup_delay;
unsigned enable_high:1;
unsigned enabled_at_boot:1;
struct regulator_init_data *init_data;
--
1.6.0.4

\
 
 \ /
  Last update: 2010-01-13 14:15    [from the cache]
©2003-2011 Jasper Spaans