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authorSowjanya Komatineni <skomatineni@nvidia.com>2019-04-04 17:14:16 -0700
committerMark Brown <broonie@kernel.org>2019-04-08 14:14:10 +0700
commitf1ca9992ced71029735784de138f53446363087f (patch)
treee0dc359aa07e160039ce89071bd7d73c461ec200 /drivers/spi
parent24496da6927fa7399f7f60ab31b4cea27ec3ed00 (diff)
downloadlinux-f1ca9992ced71029735784de138f53446363087f.tar.bz2
spi: add a method for configuring CS timing
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 <skomatineni@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index fd1372fe0505..bf4027b54a19 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2995,6 +2995,21 @@ int spi_setup(struct spi_device *spi)
}
EXPORT_SYMBOL_GPL(spi_setup);
+/**
+ * spi_set_cs_timing - configure CS setup, hold, and inactive delays
+ * @spi: the device that requires specific CS timing configuration
+ * @setup: CS setup time in terms of clock count
+ * @hold: CS hold time in terms of clock count
+ * @inactive_dly: CS inactive delay between transfers in terms of clock count
+ */
+void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold,
+ u8 inactive_dly)
+{
+ if (spi->controller->set_cs_timing)
+ spi->controller->set_cs_timing(spi, setup, hold, inactive_dly);
+}
+EXPORT_SYMBOL_GPL(spi_set_cs_timing);
+
static int __spi_validate(struct spi_device *spi, struct spi_message *message)
{
struct spi_controller *ctlr = spi->controller;