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spi: Support for DTR ops

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Merge tag 'spi-mem-dtr' into spi-nor/next

spi: Support for DTR ops

Merge the SPIMEM DTR bits in spi-nor/next so that we can
continue the development on top of them.
This commit is contained in:
Tudor Ambarus 2020-07-15 06:20:30 +03:00
commit fb249e1007
6 changed files with 45 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

14
include/linux/spi/spi-mem.h
View file

@ -17,6 +17,7 @@
{ \
.buswidth = __buswidth, \
.opcode = __opcode, \
.nbytes = 1, \
}
#define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth) \
@ -69,11 +70,15 @@ enum spi_mem_data_dir {
/**
* struct spi_mem_op - describes a SPI memory operation
* @cmd.nbytes: number of opcode bytes (only 1 or 2 are valid). The opcode is
* sent MSB-first.
* @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 +86,9 @@ 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
@ -90,23 +97,28 @@ enum spi_mem_data_dir {
*/
struct spi_mem_op {
struct {
u8 nbytes;
u8 buswidth;
u8 opcode;
u8 dtr : 1;
u16 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 {