Merge tag 'pwm/for-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "This series contains a number of improvements to existing drivers,
  such as LPSS. Some drivers, such as renesas-tpu and rcar get support
  for more SoC generations. To round things off this fixes an issue with
  the sysfs interface"

* tag 'pwm/for-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: lpss: Only set update bit if we are actually changing the settings
  pwm: lpss: Force runtime-resume on suspend on Cherry Trail
  pwm: Enable TI ECAP driver for ARCH_K3
  dt-bindings: pwm: tiecap: Add TI AM654 SoC specific compatible
  dt-bindings: pwm: rcar: Add r8a774a1 support
  pwm: Send a uevent on the pwmchip device upon channel sysfs (un)export
  Revert "pwm: Set class for exported channels in sysfs"
  dt-bindings: pwm: renesas-tpu: Document r8a7744 support
  dt-bindings: pwm: rcar: Add r8a7744 support
  dt-bindings: pwm: renesas: tpu: Document R8A779{7|8}0 bindings
  dt-bindings: pwm: renesas: pwm-rcar: Document R8A779{7|8}0 bindings
  dt-bindings: pwm: renesas: tpu: Fix "compatible" prop description
  pwm: Use SPDX identifier for Renesas drivers
  pwm: lpss: Add get_state callback
  pwm: lpss: Release runtime-pm reference from the driver's remove callback
  pwm: lpss: Check PWM powerstate after resume on Cherry Trail devices
  pwm: lpss: Move struct pwm_lpss_chip definition to the header file
  pwm: lpss: Add ACPI HID for second PWM controller on Cherry Trail devices
  ACPI / PM: Export acpi_device_get_power() for use by modular build drivers
  pwm: tegra: Remove gratuituous blank line

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 7c71cdb8a9d8..ceb233dd6048 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -249,6 +249,7 @@ static void pwm_export_release(struct device *child)
 static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
 {
 	struct pwm_export *export;
+	char *pwm_prop[2];
 	int ret;
 
 	if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))
@@ -263,7 +264,6 @@ static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
 	export->pwm = pwm;
 	mutex_init(&export->lock);
 
-	export->child.class = parent->class;
 	export->child.release = pwm_export_release;
 	export->child.parent = parent;
 	export->child.devt = MKDEV(0, 0);
@@ -277,6 +277,10 @@ static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
 		export = NULL;
 		return ret;
 	}
+	pwm_prop[0] = kasprintf(GFP_KERNEL, "EXPORT=pwm%u", pwm->hwpwm);
+	pwm_prop[1] = NULL;
+	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);
+	kfree(pwm_prop[0]);
 
 	return 0;
 }
@@ -289,6 +293,7 @@ static int pwm_unexport_match(struct device *child, void *data)
 static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
 {
 	struct device *child;
+	char *pwm_prop[2];
 
 	if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))
 		return -ENODEV;
@@ -297,6 +302,11 @@ static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
 	if (!child)
 		return -ENODEV;
 
+	pwm_prop[0] = kasprintf(GFP_KERNEL, "UNEXPORT=pwm%u", pwm->hwpwm);
+	pwm_prop[1] = NULL;
+	kobject_uevent_env(&parent->kobj, KOBJ_CHANGE, pwm_prop);
+	kfree(pwm_prop[0]);
+
 	/* for device_find_child() */
 	put_device(child);
 	device_unregister(child);