[PATCH v10 2/3] mtd: spi-nand: Add support for randomizer

Cheng Ming Lin
2026-05-05T01:37:38Z

This patch adds support for the randomizer feature.

It introduces a 'set_randomizer' callback in 'struct spinand_info' and
'struct spinand_device'.

If a driver implements this callback, the core will invoke it during
device initialization (spinand_init) to enable or disable the randomizer
feature based on the device tree configuration.

Signed-off-by: Cheng Ming Lin <chengminglin@mxic.com.tw>
---
drivers/mtd/nand/spi/core.c | 20 ++++++++++++++++++++
include/linux/mtd/spinand.h | 9 +++++++++
2 files changed, 29 insertions(+)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 8aa3753aa..78557e48f 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1307,6 +1307,22 @@ static int spinand_create_dirmaps(struct spinand_device *spinand)
return 0;
}

+static int spinand_randomizer_init(struct spinand_device *spinand)
+{
+ struct device_node *np = spinand->spimem->spi->dev.of_node;
+ u32 rand_val;
+ int ret;
+
+ if (!spinand->set_randomizer)
+ return 0;
+
+ ret = of_property_read_u32(np, "nand-randomizer", &rand_val);
+ if (ret)
+ return 0;
+
+ return spinand->set_randomizer(spinand, rand_val);
+}
+
static const struct nand_ops spinand_ops = {
.erase = spinand_erase,
.markbad = spinand_markbad,
@@ -1594,6 +1610,7 @@ int spinand_match_and_init(struct spinand_device *spinand,
spinand->user_otp = &table[i].user_otp;
spinand->read_retries = table[i].read_retries;
spinand->set_read_retry = table[i].set_read_retry;
+ spinand->set_randomizer = table[i].set_randomizer;

/* I/O variants selection with single-spi SDR commands */

@@ -1881,6 +1898,9 @@ static int spinand_init(struct spinand_device *spinand)
* ECC initialization must have happened previously.
*/
spinand_cont_read_init(spinand);
+ ret = spinand_randomizer_init(spinand);
+ if (ret)
+ goto err_cleanup_nanddev;

mtd->_read_oob = spinand_mtd_read;
mtd->_write_oob = spinand_mtd_write;
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 58abd306e..9ec45b727 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -585,6 +585,7 @@ enum spinand_bus_interface {
* @user_otp: SPI NAND user OTP info.
* @read_retries: the number of read retry modes supported
* @set_read_retry: enable/disable read retry for data recovery
+ * @set_randomizer: enable/disable randomizer support
*
* Each SPI NAND manufacturer driver should have a spinand_info table
* describing all the chips supported by the driver.
@@ -613,6 +614,8 @@ struct spinand_info {
unsigned int read_retries;
int (*set_read_retry)(struct spinand_device *spinand,
unsigned int read_retry);
+ int (*set_randomizer)(struct spinand_device *spinand,
+ bool enable);
};

#define SPINAND_ID(__method, ...) \
@@ -669,6 +672,9 @@ struct spinand_info {
.read_retries = __read_retries, \
.set_read_retry = __set_read_retry

+#define SPINAND_RANDOMIZER(__set_randomizer) \
+ .set_randomizer = __set_randomizer
+
#define SPINAND_INFO(__model, __id, __memorg, __eccreq, __op_variants, \
__flags, ...) \
{ \
@@ -754,6 +760,7 @@ struct spinand_mem_ops {
* @user_otp: SPI NAND user OTP info.
* @read_retries: the number of read retry modes supported
* @set_read_retry: Enable/disable the read retry feature
+ * @set_randomizer: Enable/disable the randomizer feature
*/
struct spinand_device {
struct nand_device base;
@@ -787,6 +794,8 @@ struct spinand_device {
bool cont_read_possible;
int (*set_cont_read)(struct spinand_device *spinand,
bool enable);
+ int (*set_randomizer)(struct spinand_device *spinand,
+ bool enable);

const struct spinand_fact_otp *fact_otp;
const struct spinand_user_otp *user_otp;
--
2.25.1