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From:   Tudor Ambarus <tudor.ambarus@linaro.org>
To:     michael@walle.cc, pratyush@kernel.org
Cc:     miquel.raynal@bootlin.com, richard@nod.at,
        Takahiro.Kuwano@infineon.com, bacem.daassi@infineon.com,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
        Tudor Ambarus <tudor.ambarus@linaro.org>
Subject: [PATCH v4 03/11] mtd: spi-nor: core: Update name and description of spansion_set_4byte_addr_mode
Date:   Wed, 22 Mar 2023 06:40:25 +0000
Message-Id: <20230322064033.2370483-4-tudor.ambarus@linaro.org>
In-Reply-To: <20230322064033.2370483-1-tudor.ambarus@linaro.org>
References: <20230322064033.2370483-1-tudor.ambarus@linaro.org>
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Rename method to spi_nor_set_4byte_addr_mode_brwr and extend its
description. This method is described in JESD216 BFPT[SFDP_DWORD(16)],
BIT(28) and BIT(20).

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
---
 drivers/mtd/spi-nor/core.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 2cb7425b3694..e80dcd87189b 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -564,15 +564,20 @@ int spi_nor_set_4byte_addr_mode_wren_en4b_ex4b(struct spi_nor *nor, bool enable)
 }
 
 /**
- * spansion_set_4byte_addr_mode() - Set 4-byte address mode for Spansion
- * flashes.
+ * spi_nor_set_4byte_addr_mode_brwr() - Set 4-byte address mode using
+ *			SPINOR_OP_BRWR. Typically used by Spansion flashes.
  * @nor:	pointer to 'struct spi_nor'.
  * @enable:	true to enter the 4-byte address mode, false to exit the 4-byte
  *		address mode.
  *
+ * 8-bit volatile bank register used to define A[30:A24] bits. MSB (bit[7]) is
+ * used to enable/disable 4-byte address mode. When MSB is set to ‘1’, 4-byte
+ * address mode is active and A[30:24] bits are don’t care. Write instruction is
+ * SPINOR_OP_BRWR(17h) with 1 byte of data.
+ *
  * Return: 0 on success, -errno otherwise.
  */
-static int spansion_set_4byte_addr_mode(struct spi_nor *nor, bool enable)
+static int spi_nor_set_4byte_addr_mode_brwr(struct spi_nor *nor, bool enable)
 {
 	int ret;
 
@@ -2599,7 +2604,7 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	struct device_node *np = spi_nor_get_flash_node(nor);
 
 	params->quad_enable = spi_nor_sr2_bit1_quad_enable;
-	params->set_4byte_addr_mode = spansion_set_4byte_addr_mode;
+	params->set_4byte_addr_mode = spi_nor_set_4byte_addr_mode_brwr;
 	params->otp.org = &info->otp_org;
 
 	/* Default to 16-bit Write Status (01h) Command */
-- 
2.40.0.rc1.284.g88254d51c5-goog