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| author |   Axel Haslam <ahaslam@baylibre.com> | 2016-07-14 15:13:00 -0500 |
|---|---|---|
| committer |   Alex Elder <elder@linaro.org> | 2016-07-14 16:53:55 -0500 |
| commit | 4c615dcc6a9d910f8f68e4b57889b628e80165d4 (patch) | |
| tree | 539525646534ef8b25c78c6a47477e66288b539c /drivers/staging/greybus/spilib.c | |
| parent | greybus: pwm: Add runtime_pm support (diff) | |
| download | linux-dev-4c615dcc6a9d910f8f68e4b57889b628e80165d4.tar.xz linux-dev-4c615dcc6a9d910f8f68e4b57889b628e80165d4.zip | |
greybus: spi: Add runtime_pm support
Add runtime operations to the spi driver so that the
module is woken up when an spi transfer is started
and put back to sleep when the transfer is done.
Testing Done: Let the module enter standby and initiate
an spi operation. The operation wakes up the module
and succeeds.
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Alex Elder <elder@linaro.org>
Diffstat (limited to 'drivers/staging/greybus/spilib.c')
| -rw-r--r-- | drivers/staging/greybus/spilib.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/staging/greybus/spilib.c b/drivers/staging/greybus/spilib.c index 527909b26d79..e4c82e0a322b 100644 --- a/drivers/staging/greybus/spilib.c +++ b/drivers/staging/greybus/spilib.c @@ -15,6 +15,7 @@ #include "greybus.h" #include "spilib.h" +#include "gbphy.h" struct gb_spilib { struct gb_connection *connection; @@ -372,6 +373,26 @@ out: return ret; } +#ifndef SPI_CORE_SUPPORT_PM +static int gb_spi_prepare_transfer_hardware(struct spi_master *master) +{ + struct gb_spilib *spi = spi_master_get_devdata(master); + struct gbphy_device *gbphy_dev = to_gbphy_dev(spi->parent); + + return gbphy_runtime_get_sync(gbphy_dev); +} + +static int gb_spi_unprepare_transfer_hardware(struct spi_master *master) +{ + struct gb_spilib *spi = spi_master_get_devdata(master); + struct gbphy_device *gbphy_dev = to_gbphy_dev(spi->parent); + + gbphy_runtime_put_autosuspend(gbphy_dev); + + return 0; +} +#endif + static int gb_spi_setup(struct spi_device *spi) { /* Nothing to do for now */ @@ -497,6 +518,14 @@ int gb_spilib_master_init(struct gb_connection *connection, struct device *dev) master->setup = gb_spi_setup; master->transfer_one_message = gb_spi_transfer_one_message; +#ifndef SPI_CORE_SUPPORT_PM + master->prepare_transfer_hardware = gb_spi_prepare_transfer_hardware; + master->unprepare_transfer_hardware = + gb_spi_unprepare_transfer_hardware; +#else + master->auto_runtime_pm = true; +#endif + ret = spi_register_master(master); if (ret < 0) goto exit_spi_put; |