[PATCH v5 18/32] mtd: spi-nor: allow a flash to define its own ready() function

From: Michael Walle
Date: Wed Feb 23 2022 - 08:45:04 EST


Xilinx and Micron flashes have their own implementation of the
spi_nor_ready() function. At the moment, the core will figure out
which one to call according to some flags. Lay the foundation to
make it possible that a flash can register its own ready()
function.

Signed-off-by: Michael Walle <michael@xxxxxxxx>
Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Reviewed-by: Pratyush Yadav <p.yadav@xxxxxx>
---
drivers/mtd/spi-nor/core.c | 4 ++++
drivers/mtd/spi-nor/core.h | 4 ++++
2 files changed, 8 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 4d2036cdce42..390a9ab413b7 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -794,6 +794,10 @@ static int spi_nor_ready(struct spi_nor *nor)
{
int sr, fsr;

+ /* Flashes might override the standard routine. */
+ if (nor->params->ready)
+ return nor->params->ready(nor);
+
if (nor->flags & SNOR_F_READY_XSR_RDY)
sr = spi_nor_xsr_ready(nor);
else
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 4fe16b5aa3f5..fdc8c0f31f5c 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -261,6 +261,9 @@ struct spi_nor_otp {
* SPI NOR flashes that have peculiarities to the SPI NOR
* standard e.g. different opcodes, specific address
* calculation, page size, etc.
+ * @ready: (optional) flashes might use a different mechanism
+ * than reading the status register to indicate they
+ * are ready for a new command
* @locking_ops: SPI NOR locking methods.
*/
struct spi_nor_flash_parameter {
@@ -282,6 +285,7 @@ struct spi_nor_flash_parameter {
int (*set_4byte_addr_mode)(struct spi_nor *nor, bool enable);
u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
int (*setup)(struct spi_nor *nor, const struct spi_nor_hwcaps *hwcaps);
+ int (*ready)(struct spi_nor *nor);

const struct spi_nor_locking_ops *locking_ops;
};
--
2.30.2