[PATCH 03/15] spi: spi-mem: allow specifying whether an op is DTR or not

[Pratyush Yadav <p.yadav@ti.com>]

Each phase is given a separate 'is_dtr' field so mixed protocols like
4S-4D-4D can be supported.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/spi/spi-mem.c | 24 ++++++++++++++++++++++++
 include/spi-mem.h     |  8 ++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index e900c997bd..218496d8d2 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -104,6 +104,16 @@ void spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
 EXPORT_SYMBOL_GPL(spi_controller_dma_unmap_mem_op_data);
 #endif /* __UBOOT__ */
 
+static int spi_check_dtr_req(struct spi_slave *slave, bool tx)
+{
+	u32 mode = slave->mode;
+
+	if ((tx && (mode & SPI_TX_DTR)) || (!tx && (mode & SPI_RX_DTR)))
+		return 0;
+
+	return -ENOTSUPP;
+}
+
 static int spi_check_buswidth_req(struct spi_slave *slave, u8 buswidth, bool tx)
 {
 	u32 mode = slave->mode;
@@ -158,6 +168,20 @@ bool spi_mem_default_supports_op(struct spi_slave *slave,
 				   op->data.dir == SPI_MEM_DATA_OUT))
 		return false;
 
+	if (op->cmd.is_dtr && spi_check_dtr_req(slave, true))
+		return false;
+
+	if (op->addr.is_dtr && spi_check_dtr_req(slave, true))
+		return false;
+
+	if (op->dummy.is_dtr &&
+	    spi_check_dtr_req(slave, true))
+		return false;
+
+	if (op->data.is_dtr &&
+	    spi_check_dtr_req(slave, op->data.dir == SPI_MEM_DATA_OUT))
+		return false;
+
 	return true;
 }
 EXPORT_SYMBOL_GPL(spi_mem_default_supports_op);
diff --git a/include/spi-mem.h b/include/spi-mem.h
index 36814efa86..1ae5f2b302 100644
--- a/include/spi-mem.h
+++ b/include/spi-mem.h
@@ -72,6 +72,7 @@ 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.is_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
@@ -79,11 +80,14 @@ enum spi_mem_data_dir {
  *	      Note that only @addr.nbytes are taken into account in this
  *	      address value, so users should make sure the value fits in the
  *	      assigned number of bytes.
+ * @addr.is_dtr: whether the address should be sent in DTR mode or not
  * @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.is_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.dir: direction of the transfer
+ * @data.is_dtr: whether the data should be sent in DTR mode or not
  * @data.buf.in: input buffer
  * @data.buf.out: output buffer
  */
@@ -91,23 +95,27 @@ struct spi_mem_op {
 	struct {
 		u8 buswidth;
 		u8 opcode;
+		bool is_dtr;
 	} cmd;
 
 	struct {
 		u8 nbytes;
 		u8 buswidth;
 		u64 val;
+		bool is_dtr;
 	} addr;
 
 	struct {
 		u8 nbytes;
 		u8 buswidth;
+		bool is_dtr;
 	} dummy;
 
 	struct {
 		u8 buswidth;
 		enum spi_mem_data_dir dir;
 		unsigned int nbytes;
+		bool is_dtr;
 		/* buf.{in,out} must be DMA-able. */
 		union {
 			void *in;
-- 
2.25.0