From 8eee6b9dd30d5b20a4c31886057a68bb6a2736c9 Mon Sep 17 00:00:00 2001 From: Thor Thayer Date: Mon, 10 Oct 2016 09:25:24 -0500 Subject: spi: Add Flag to Enable Slave Select with GPIO Chip Select. Some SPI masters require slave selection before the transfer can begin [1]. The SPI framework currently selects the chip using either 1) the internal CS mechanism or 2) the GPIO CS, but not both. This patch adds a new master->flags define to indicate both the GPIO CS and the internal chip select mechanism should be used. Tested On: Altera CycloneV development kit Compile tested for build errors on x86_64 (allyesconfigs) [1] DesignWare dw_apb_ssi Databook, Version 3.20a (page 39) Signed-off-by: Thor Thayer Signed-off-by: Mark Brown --- include/linux/spi/spi.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/spi') diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 4b743ac35396..75c6bd0ac605 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -442,6 +442,7 @@ struct spi_master { #define SPI_MASTER_NO_TX BIT(2) /* can't do buffer write */ #define SPI_MASTER_MUST_RX BIT(3) /* requires rx */ #define SPI_MASTER_MUST_TX BIT(4) /* requires tx */ +#define SPI_MASTER_GPIO_SS BIT(5) /* GPIO CS must select slave */ /* * on some hardware transfer / message size may be constrained -- cgit v1.2.3