kernel/linux.git/include/linux/spi/spi.h, branch v5.3.1

Merge remote-tracking branch 'spi/topic/pump-rt' into spi-next

2019-07-04T16:35:11+00:00

spi: Add a prototype for exported spi_set_cs_timing()

2019-06-17T12:49:56+00:00

Compiler is not happy about spi_set_cs_timing() prototype. drivers/spi/spi.c:3016:6: warning: no previous prototype for ‘spi_set_cs_timing’ [-Wmissing-prototypes] void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold, ^~~~~~~~~~~~~~~~~ Let's add it to the header. Signed-off-by: Andy Shevchenko Signed-off-by: Mark Brown

spi: Allow SPI devices to request the pumping thread be realtime

2019-05-23T13:44:02+00:00

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 Reviewed-by: Guenter Roeck Tested-by: Enric Balletbo i Serra Signed-off-by: Mark Brown

spi: core: allow reporting the effectivly used speed_hz for a transfer

2019-05-13T12:11:36+00:00

Provide a means for the spi bus driver to report the effectively used spi clock frequency used for each spi_transfer. Signed-off-by: Martin Sperl Signed-off-by: Mark Brown

Merge tag 'spi-bpw-is-supported' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.3

2019-05-12T03:08:03+00:00

spi: Add spi_is_bpw_supported() Lets client drivers check and potentially handle issues.

spi: core: allow defining time that cs is deasserted as a multiple of SCK

2019-05-08T09:30:01+00:00

Support setting a delay between cs assert and deassert as a multiple of spi clock length. Signed-off-by: Martin Sperl Signed-off-by: Mark Brown

spi: core: allow defining time that cs is deasserted

2019-05-08T09:28:51+00:00

For some SPI devices that support speed_hz > 1MHz the default 10 us delay when cs_change = 1 is typically way to long and may result in poor spi bus utilization. This patch makes it possible to control the delay at micro or nano second resolution on a per spi_transfer basis. It even allows an "as fast as possible" mode with: xfer.cs_change_delay_unit = SPI_DELAY_UNIT_NSECS; xfer.cs_change_delay = 0; The delay code is shared between delay_usecs and cs_change_delay for consistency and reuse, so in the future this change_delay_unit could also apply to delay_usec as well. Note that on slower SOCs/CPU actually reaching ns deasserts on cs is not realistic as the gpio overhead alone (without any delays added ) may already leave cs deasserted for more than 1us - at least on a raspberry pi. But at the very least this way we can keep it as short as possible. Signed-off-by: Martin Sperl Signed-off-by: Mark Brown

spi: expand mode support

2019-05-02T01:37:55+00:00

This patch changes mode and mode_bits from u16 to u32 to allow more mode configurations. Signed-off-by: Sowjanya Komatineni Signed-off-by: Mark Brown

spi: Add spi_is_bpw_supported()

2019-04-12T10:13:36+00:00

This let SPI clients check if the controller supports a particular word width. drivers/gpu/drm/tinydrm/mipi-dbi.c will use this to determine if the controller supports 16-bit for RGB565 pixels. If it doesn't it will swap the bytes before transfer on little endian machines. Signed-off-by: Noralf Trønnes Signed-off-by: Mark Brown

spi: add a method for configuring CS timing

2019-04-08T07:14:10+00:00

This patch creates set_cs_timing SPI master optional method for SPI masters to implement configuring CS timing if applicable. This patch also creates spi_cs_timing accessory for SPI clients to use for requesting SPI master controllers to configure device requested CS setup time, hold time and inactive delay. Signed-off-by: Sowjanya Komatineni Signed-off-by: Mark Brown