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spi: spi-mem: allow specifying whether an op is DTR or not

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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>
This commit is contained in:
Pratyush Yadav 2020-06-24 00:00:14 +05:30 committed by Mark Brown
parent b3a9e3b962
commit 4c5e2bba30
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2 changed files with 11 additions and 0 deletions
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3
drivers/spi/spi-mem.c
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@ -156,6 +156,9 @@ bool spi_mem_default_supports_op(struct spi_mem *mem,
op->data.dir == SPI_MEM_DATA_OUT))
return false;
if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
return false;
return true;
}
EXPORT_SYMBOL_GPL(spi_mem_default_supports_op);

8
include/linux/spi/spi-mem.h
View File

@ -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 {