linux-kernel - [PATCH v3 18/32] mtd: spi-nor: allow a flash to define its own ready() function

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Date:   Mon, 21 Feb 2022 09:52:22 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        yaliang.wang@...driver.com, Michael Walle <michael@...le.cc>
Subject: [PATCH v3 18/32] mtd: spi-nor: allow a flash to define its own ready() function

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@...le.cc>
Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Reviewed-by: Pratyush Yadav <p.yadav@...com>
---
 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