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authorSean Wang <sean.wang@mediatek.com>2018-07-09 23:56:58 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-15 12:23:53 +0200
commit76d8ca245c721c12f79779679699b229e361f4ac (patch)
tree3bd60e45570a97bfce04edf946edff7a6c0cfc64 /drivers/tty/serdev
parent819abf294a381499a177a660805bf0b8a329700b (diff)
serdev: add dev_pm_domain_attach|detach()
In order to open up the required power gate before any operation can be effectively performed over the serial bus between CPU and serdev, it's clearly essential to add common attach functions for PM domains to serdev at the probe phase. Similarly, the relevant dettach function for the PM domains should be properly and reversely added at the remove phase. Signed-off-by: Sean Wang <sean.wang@mediatek.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Johan Hovold <johan@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-serial@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serdev')
-rw-r--r--drivers/tty/serdev/core.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index bd47c46ec993..9db93f500b4e 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/serdev.h>
#include <linux/slab.h>
@@ -350,8 +351,17 @@ EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
static int serdev_drv_probe(struct device *dev)
{
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
+ int ret;
- return sdrv->probe(to_serdev_device(dev));
+ ret = dev_pm_domain_attach(dev, true);
+ if (ret)
+ return ret;
+
+ ret = sdrv->probe(to_serdev_device(dev));
+ if (ret)
+ dev_pm_domain_detach(dev, true);
+
+ return ret;
}
static int serdev_drv_remove(struct device *dev)
@@ -359,6 +369,9 @@ static int serdev_drv_remove(struct device *dev)
const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
if (sdrv->remove)
sdrv->remove(to_serdev_device(dev));
+
+ dev_pm_domain_detach(dev, true);
+
return 0;
}