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authorLaxman Dewangan <ldewangan@nvidia.com>2017-04-07 15:04:02 +0530
committerThierry Reding <thierry.reding@gmail.com>2017-04-12 16:10:09 +0200
commit4a813b262f85ac34c9f3e557d9be79f846a381df (patch)
tree69dd229e8e8d087c5dabbd71bd18142763a18be4 /drivers/pwm
parent0dafdd168b0f441668e0d96a508af35a986374bf (diff)
downloadop-kernel-dev-4a813b262f85ac34c9f3e557d9be79f846a381df.zip
op-kernel-dev-4a813b262f85ac34c9f3e557d9be79f846a381df.tar.gz
pwm: tegra: Add support to configure pin state in suspends/resume
In some of NVIDIA Tegra's platform, PWM controller is used to control the PWM controlled regulators. PWM signal is connected to the VID pin of the regulator where duty cycle of PWM signal decide the voltage level of the regulator output. When system enters suspend, some PWM client/slave regulator devices require the PWM output to be tristated. Add support to configure the pin state via pinctrl frameworks in suspend and active state of the system. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-tegra.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index 21518be..9c7f180 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -29,6 +29,7 @@
#include <linux/of_device.h>
#include <linux/pwm.h>
#include <linux/platform_device.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/slab.h>
#include <linux/reset.h>
@@ -255,6 +256,18 @@ static int tegra_pwm_remove(struct platform_device *pdev)
return pwmchip_remove(&pc->chip);
}
+#ifdef CONFIG_PM_SLEEP
+static int tegra_pwm_suspend(struct device *dev)
+{
+ return pinctrl_pm_select_sleep_state(dev);
+}
+
+static int tegra_pwm_resume(struct device *dev)
+{
+ return pinctrl_pm_select_default_state(dev);
+}
+#endif
+
static const struct tegra_pwm_soc tegra20_pwm_soc = {
.num_channels = 4,
};
@@ -271,10 +284,15 @@ static const struct of_device_id tegra_pwm_of_match[] = {
MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
+static const struct dev_pm_ops tegra_pwm_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_pwm_suspend, tegra_pwm_resume)
+};
+
static struct platform_driver tegra_pwm_driver = {
.driver = {
.name = "tegra-pwm",
.of_match_table = tegra_pwm_of_match,
+ .pm = &tegra_pwm_pm_ops,
},
.probe = tegra_pwm_probe,
.remove = tegra_pwm_remove,
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