From: David Lechner <david@lechnology.com>
To: linux-spi@vger.kernel.org, linux-iio@vger.kernel.org
Cc: David Lechner <david@lechnology.com>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Mark Brown <broonie@kernel.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/4] spi: add new SPI_CS_WORD flag
Date: Wed, 12 Sep 2018 19:39:17 -0500 [thread overview]
Message-ID: <20180913003920.30600-2-david@lechnology.com> (raw)
In-Reply-To: <20180913003920.30600-1-david@lechnology.com>
This adds a new SPI mode flag, SPI_CS_WORD, that is used to indicate
that a SPI device requires the chip select to be toggled after each
word that is transferred.
Signed-off-by: David Lechner <david@lechnology.com>
---
include/linux/spi/spi.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index d698f9db3484..7bb36145e2ba 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -163,6 +163,7 @@ struct spi_device {
#define SPI_TX_QUAD 0x200 /* transmit with 4 wires */
#define SPI_RX_DUAL 0x400 /* receive with 2 wires */
#define SPI_RX_QUAD 0x800 /* receive with 4 wires */
+#define SPI_CS_WORD 0x1000 /* toggle cs after each word */
int irq;
void *controller_state;
void *controller_data;
@@ -177,7 +178,6 @@ struct spi_device {
* the controller talks to each chip, like:
* - memory packing (12 bit samples into low bits, others zeroed)
* - priority
- * - drop chipselect after each word
* - chipselect delays
* - ...
*/
--
2.17.1
next prev parent reply other threads:[~2018-09-13 0:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-13 0:39 [PATCH v2 0/4] spi: introduce SPI_CS_WORD mode flag David Lechner
2018-09-13 0:39 ` David Lechner [this message]
2018-09-16 11:29 ` [PATCH v2 1/4] spi: add new SPI_CS_WORD flag Jonathan Cameron
2018-09-13 0:39 ` [PATCH v2 2/4] spi: add software implementation for SPI_CS_WORD David Lechner
2018-09-16 11:32 ` Jonathan Cameron
2018-09-17 21:22 ` Applied "spi: add software implementation for SPI_CS_WORD" to the spi tree Mark Brown
2018-09-13 0:39 ` [PATCH v2 3/4] iio: adc: ti-ads7950: use SPI_CS_WORD to reduce CPU usage David Lechner
2018-09-16 11:41 ` Jonathan Cameron
2018-09-16 16:24 ` David Lechner
2018-09-17 8:33 ` Jonathan Cameron
2018-09-13 0:39 ` [PATCH v2 4/4] spi: spi-davinci: Add support for SPI_CS_WORD David Lechner
2018-09-13 13:44 ` Geert Uytterhoeven
2018-09-13 14:26 ` David Lechner
2018-09-17 21:18 ` Mark Brown
2018-09-17 21:17 ` [PATCH v2 0/4] spi: introduce SPI_CS_WORD mode flag Mark Brown
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