[PATCH v6 2/3] mtd: spi-nand: Add support for randomizer
From: Cheng Ming Lin <hidden>
Date: 2026-02-23 06:19:39
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Subsystem:
memory technology devices (mtd), nand flash subsystem, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
From: Cheng Ming Lin <redacted> 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 <redacted> --- drivers/mtd/nand/spi/core.c | 27 +++++++++++++++++++++++++++ include/linux/mtd/spinand.h | 9 +++++++++ 2 files changed, 36 insertions(+)
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 8aa3753aaaa1..77a0371010c4 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c@@ -1307,6 +1307,29 @@ 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; + bool enable = false; + int ret; + + if (!spinand->set_randomizer) + return 0; + + if (of_property_read_bool(np, "nand-enable-randomizer")) + enable = true; + else if (of_property_read_bool(np, "nand-disable-randomizer")) + enable = false; + else + return 0; + + ret = spinand->set_randomizer(spinand, enable); + if (ret) + return ret; + + return 0; +} + static const struct nand_ops spinand_ops = { .erase = spinand_erase, .markbad = spinand_markbad,
@@ -1594,6 +1617,7 @@ 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 +1905,9 @@ 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 6a024cf1c53a..6a68a6c3866a 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h@@ -584,6 +584,7 @@ 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.
@@ -612,6 +613,8 @@ 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, ...) \
@@ -668,6 +671,9 @@ 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, ...) \ { \
@@ -753,6 +759,7 @@ 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;
@@ -786,6 +793,8 @@ 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