[PATCH v5 06/13] spi: spi-mem: Add an ecc_en parameter to the spi_mem_op structure

[Miquel Raynal <miquel.raynal@bootlin.com>]

Soon the SPI-NAND core will need a way to request a SPI controller to
enable ECC support for a given operation. This is because of the
pipelined integration of certain ECC engines, which are directly managed
by the SPI controller itself.

Introduce a spi_mem_op additional field for this purpose: ecc_en.

So far this field is left unset and checked to be false by all
the SPI controller drivers in their ->supports_op() hook, as they all
call spi_mem_default/dtr_supports_op().

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/spi/spi-mem.c       | 5 +++++
 include/linux/spi/spi-mem.h | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index df2ec2c8ce31..30a0921d5496 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -176,6 +176,11 @@ bool spi_mem_generic_supports_op(struct spi_mem *mem,
 			return false;
 	}
 
+	if (!caps->ecc) {
+		if (op->ecc_en)
+			return false;
+	}
+
 	return spi_mem_check_buswidth(mem, op);
 }
 EXPORT_SYMBOL_GPL(spi_mem_generic_supports_op);
diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index a17dd5035530..a667dfc8f327 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -94,6 +94,7 @@ enum spi_mem_data_dir {
  *		 operation does not involve transferring data
  * @data.buf.in: input buffer (must be DMA-able)
  * @data.buf.out: output buffer (must be DMA-able)
+ * @ecc_en: error correction is required
  */
 struct spi_mem_op {
 	struct {
@@ -126,6 +127,8 @@ struct spi_mem_op {
 			const void *out;
 		} buf;
 	} data;
+
+	bool ecc_en;
 };
 
 #define SPI_MEM_OP(__cmd, __addr, __dummy, __data)		\
@@ -223,9 +226,11 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
 /**
  * struct spi_mem_controller_caps - SPI memory controller capabilities
  * @dtr: Supports DTR operations
+ * @ecc: Supports operations with error correction
  */
 struct spi_mem_controller_caps {
 	bool dtr;
+	bool ecc;
 };
 
 /**
-- 
2.27.0