[PATCH] Add Master Sample Data Mode for SPI
Vinicius Maciel
viniciusfre at gmail.com
Fri Feb 10 14:02:47 PST 2017
In order to work appropriately, the max11043 ADC chip and probably
others, needs SPI master samples the data at the correct edge. From
max11043 datasheet: "The data at DIN is latched on the rising edge
of SCLK". Same to DOUT.
This patch add Master Sample Data Mode bit in normal sample mode.
Signed-off-by: Vinicius Maciel <viniciusfre at gmail.com>
---
drivers/spi/spi-sun4i.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index c5cd635c28f3..6325be2ce8d9 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -44,6 +44,7 @@
#define SUN4I_CTL_CS_MANUAL BIT(16)
#define SUN4I_CTL_CS_LEVEL BIT(17)
#define SUN4I_CTL_TP BIT(18)
+#define SUN4I_CTL_SDM BIT(20)
#define SUN4I_INT_CTL_REG 0x0c
#define SUN4I_INT_CTL_RF_F34 BIT(4)
@@ -407,7 +408,8 @@ static int sun4i_spi_runtime_resume(struct device *dev)
}
sun4i_spi_write(sspi, SUN4I_CTL_REG,
- SUN4I_CTL_ENABLE | SUN4I_CTL_MASTER | SUN4I_CTL_TP);
+ SUN4I_CTL_ENABLE | SUN4I_CTL_MASTER | SUN4I_CTL_TP |
+ SUN4I_CTL_SDM);
return 0;
--
2.11.0
More information about the linux-arm-kernel
mailing list