[PATCH v4 2/7] serdev: add dev_pm_domain_attach|detach()
From: sean.wang@mediatek.com (sean.wang at mediatek.com)
Date: 2018-06-27 05:43:48
Also in:
linux-bluetooth, linux-devicetree, linux-mediatek, linux-serial, lkml
Subsystem:
serial device bus, the rest, tty layer and serial drivers · Maintainers:
Rob Herring, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Sean Wang <sean.wang@mediatek.com> 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> Cc: Rob Herring <robh@kernel.org> Cc: Ulf Hansson <redacted> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <redacted> Cc: linux-serial at vger.kernel.org --- drivers/tty/serdev/core.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index df93b72..8096138 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/serdev.h> #include <linux/slab.h>
@@ -330,8 +331,17 @@ 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)
@@ -339,6 +349,9 @@ 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; }
--
2.7.4