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hwmon: (aspeed-pwm-tacho) Deassert reset in probe 

The ASPEED SoC must deassert a reset in order to use the PWM/tach
peripheral.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Joel 2017-12-23 23:35:28 +10:30 committed by Guenter Roeck
parent 8c9e527057
commit 18c514cc0e
1 changed files with 22 additions and 0 deletions
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22
drivers/hwmon/aspeed-pwm-tacho.c
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@ -19,6 +19,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
@ -181,6 +182,7 @@ struct aspeed_cooling_device {
struct aspeed_pwm_tacho_data {
struct regmap *regmap;
struct reset_control *rst;
unsigned long clk_freq;
bool pwm_present[8];
bool fan_tach_present[16];
@ -905,6 +907,13 @@ static int aspeed_create_fan(struct device *dev,
return 0;
}
static void aspeed_pwm_tacho_remove(void *data)
{
struct aspeed_pwm_tacho_data *priv = data;
reset_control_assert(priv->rst);
}
static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -931,6 +940,19 @@ static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
&aspeed_pwm_tacho_regmap_config);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
priv->rst = devm_reset_control_get_exclusive(dev, NULL);
if (IS_ERR(priv->rst)) {
dev_err(dev,
"missing or invalid reset controller device tree entry");
return PTR_ERR(priv->rst);
}
reset_control_deassert(priv->rst);
ret = devm_add_action_or_reset(dev, aspeed_pwm_tacho_remove, priv);
if (ret)
return ret;
regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE, 0);
regmap_write(priv->regmap, ASPEED_PTCR_TACH_SOURCE_EXT, 0);