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authorDouglas Anderson <dianders@chromium.org>2019-05-15 19:48:12 +0300
committerMark Brown <broonie@kernel.org>2019-05-23 16:44:02 +0300
commit924b5867e7bd6a6a98014f0517b747465b108011 (patch)
tree5c66c777dc99113fc4340627ae897a855b5961fc /include/linux/spi
parenta188339ca5a396acc588e5851ed7e19f66b0ebd9 (diff)
downloadlinux-924b5867e7bd6a6a98014f0517b747465b108011.tar.xz
spi: Allow SPI devices to request the pumping thread be realtime
Right now the only way to get the SPI pumping thread bumped up to realtime priority is for the controller to request it. However it may be that the controller works fine with the normal priority but communication to a particular SPI device on the bus needs realtime priority. Let's add a way for devices to request realtime priority when they set themselves up. NOTE: this will just affect the priority of transfers that end up on the SPI core's pumping thread. In many cases transfers happen in the context of the caller so if you need realtime priority for all transfers you should ensure the calling context is also realtime priority. Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Guenter Roeck <groeck@chromium.org> Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/spi.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 053abd22ad31..15505c2485d6 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -109,6 +109,7 @@ void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
* This may be changed by the device's driver, or left at the
* default (0) indicating protocol words are eight bit bytes.
* The spi_transfer.bits_per_word can override this for each transfer.
+ * @rt: Make the pump thread real time priority.
* @irq: Negative, or the number passed to request_irq() to receive
* interrupts from this device.
* @controller_state: Controller's runtime state
@@ -143,6 +144,7 @@ struct spi_device {
u32 max_speed_hz;
u8 chip_select;
u8 bits_per_word;
+ bool rt;
u32 mode;
#define SPI_CPHA 0x01 /* clock phase */
#define SPI_CPOL 0x02 /* clock polarity */