From: Wolfgang Ocker Date: Wed, 15 Oct 2008 13:00:47 +0000 (+0200) Subject: of/spi: Support specifying chip select as active high via device tree X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f618ebfcbf9616a0fa9a78f5ecb69762f0fa3c59;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git of/spi: Support specifying chip select as active high via device tree The patch allows to specify that an SPI device needs an active high chip select. Signed-off-by: Wolfgang Ocker Signed-off-by: Kumar Gala --- diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt index de4063cb4fdc..02ea9a971b8e 100644 --- a/Documentation/powerpc/booting-without-of.txt +++ b/Documentation/powerpc/booting-without-of.txt @@ -1917,6 +1917,8 @@ platforms are moved over to use the flattened-device-tree model. inverse clock polarity (CPOL) mode - spi-cpha - (optional) Empty property indicating device requires shifted clock phase (CPHA) mode + - spi-cs-high - (optional) Empty property indicating device requires + chip select active high SPI example for an MPC5200 SPI bus: spi@f00 { diff --git a/drivers/of/of_spi.c b/drivers/of/of_spi.c index b01eec026f68..bed0ed6dcdc1 100644 --- a/drivers/of/of_spi.c +++ b/drivers/of/of_spi.c @@ -61,6 +61,8 @@ void of_register_spi_devices(struct spi_master *master, struct device_node *np) spi->mode |= SPI_CPHA; if (of_find_property(nc, "spi-cpol", NULL)) spi->mode |= SPI_CPOL; + if (of_find_property(nc, "spi-cs-high", NULL)) + spi->mode |= SPI_CS_HIGH; /* Device speed */ prop = of_get_property(nc, "spi-max-frequency", &len);