[PATCH v7 02/14] spi: spi-mem: Introduce a capability structure

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

Create a spi_controller_mem_caps structure and put it within the
spi_controller_mem_ops structure as these are highly related. So far the
only field in this structure is the support for dtr operations, but soon
we will add another parameter.

Also create a helper to parse the capabilities and check if the
requested capability has been set or not.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 include/linux/spi/spi-mem.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 85e2ff7b840d..045ecb7c6f50 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -220,6 +220,17 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
 	return mem->drvpriv;
 }
 
+/**
+ * struct spi_controller_mem_caps - SPI memory controller capabilities
+ * @dtr: Supports DTR operations
+ */
+struct spi_controller_mem_caps {
+	bool dtr;
+};
+
+#define spi_mem_controller_is_capable(ctlr, cap)		\
+	((ctlr)->mem_ops->caps && (ctlr)->mem_ops->caps->cap)	\
+
 /**
  * struct spi_controller_mem_ops - SPI memory operations
  * @adjust_op_size: shrink the data xfer of an operation to match controller's
@@ -253,6 +264,7 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
  * @poll_status: poll memory device status until (status & mask) == match or
  *               when the timeout has expired. It fills the data buffer with
  *               the last status value.
+ * @caps: controller capabilities for the handling of the above operations.
  *
  * This interface should be implemented by SPI controllers providing an
  * high-level interface to execute SPI memory operation, which is usually the
@@ -283,6 +295,7 @@ struct spi_controller_mem_ops {
 			   unsigned long initial_delay_us,
 			   unsigned long polling_rate_us,
 			   unsigned long timeout_ms);
+	const struct spi_controller_mem_caps *caps;
 };
 
 /**
-- 
2.27.0