[PATCH v2 2/6] spi: Export spi_set_cs() function

[Heiko Stuebner <heiko@sntech.de>]

From: Heiko Stuebner <heiko.stuebner@cherry.de>

While spi_set_cs is currently only used when the SPI framework manages
the core transfer function, it contains a lot of functionality that
can be used for the upcoming atomic transfers, where a driver implementing
that atomic transfer could profit from not having to duplicate the
chip-select functionality.

The only sleeping part was the spi_delay_exec function doing the
chip-select delays, which can now also run in atomic contexts.

So export the function.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
---
 drivers/spi/spi.c       | 3 ++-
 include/linux/spi/spi.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e79f16aca1a3..b268357e933c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1268,7 +1268,7 @@ static void spi_toggle_csgpiod(struct spi_device *spi, u8 idx, bool enable, bool
 		spi_delay_exec(&spi->cs_inactive, NULL);
 }
 
-static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
+void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 {
 	bool activate = enable;
 	u8 idx;
@@ -1325,6 +1325,7 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 			spi_delay_exec(&spi->cs_inactive, NULL);
 	}
 }
+EXPORT_SYMBOL_GPL(spi_set_cs);
 
 #ifdef CONFIG_HAS_DMA
 static int spi_map_buf_attrs(struct spi_controller *ctlr, struct device *dev,
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index fb4baa0d3398..0bf31776c54c 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -349,6 +349,8 @@ static inline bool spi_is_csgpiod(struct spi_device *spi)
 	return false;
 }
 
+extern void spi_set_cs(struct spi_device *spi, bool enable, bool force);
+
 /**
  * struct spi_driver - Host side "protocol" driver
  * @id_table: List of SPI devices supported by this driver
-- 
2.53.0