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authorPratyush Yadav <p.yadav@ti.com>2020-06-24 00:00:14 +0530
committerMark Brown <broonie@kernel.org>2020-07-14 17:29:37 +0100
commit4c5e2bba30e49b970a0fd07b43e0b7a3b5fd5ea7 (patch)
tree26f3159168133fdb63292c707deb896d6248631e /include/linux/spi
parentb3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff)
spi: spi-mem: allow specifying whether an op is DTR or not
Each phase is given a separate 'dtr' field so mixed protocols like 4S-4D-4D can be supported. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200623183030.26591-2-p.yadav@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/spi-mem.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index af9ff2f0f1b2..e3dcb956bf61 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -71,9 +71,11 @@ enum spi_mem_data_dir {
* struct spi_mem_op - describes a SPI memory operation
* @cmd.buswidth: number of IO lines used to transmit the command
* @cmd.opcode: operation opcode
+ * @cmd.dtr: whether the command opcode should be sent in DTR mode or not
* @addr.nbytes: number of address bytes to send. Can be zero if the operation
* does not need to send an address
* @addr.buswidth: number of IO lines used to transmit the address cycles
+ * @addr.dtr: whether the address should be sent in DTR mode or not
* @addr.val: address value. This value is always sent MSB first on the bus.
* Note that only @addr.nbytes are taken into account in this
* address value, so users should make sure the value fits in the
@@ -81,7 +83,9 @@ enum spi_mem_data_dir {
* @dummy.nbytes: number of dummy bytes to send after an opcode or address. Can
* be zero if the operation does not require dummy bytes
* @dummy.buswidth: number of IO lanes used to transmit the dummy bytes
+ * @dummy.dtr: whether the dummy bytes should be sent in DTR mode or not
* @data.buswidth: number of IO lanes used to send/receive the data
+ * @data.dtr: whether the data should be sent in DTR mode or not
* @data.dir: direction of the transfer
* @data.nbytes: number of data bytes to send/receive. Can be zero if the
* operation does not involve transferring data
@@ -91,22 +95,26 @@ enum spi_mem_data_dir {
struct spi_mem_op {
struct {
u8 buswidth;
+ u8 dtr : 1;
u8 opcode;
} cmd;
struct {
u8 nbytes;
u8 buswidth;
+ u8 dtr : 1;
u64 val;
} addr;
struct {
u8 nbytes;
u8 buswidth;
+ u8 dtr : 1;
} dummy;
struct {
u8 buswidth;
+ u8 dtr : 1;
enum spi_mem_data_dir dir;
unsigned int nbytes;
union {