[PATCH v4 6/8] mtd: spi-nor: Add a RWW flag

From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Tudor Ambarus <tudor.ambarus@linaro.org>,
	Pratyush Yadav <pratyush@kernel.org>,
	Michael Walle <michael@walle.cc>, <linux-mtd@lists.infradead.org>
Cc: Julien Su <juliensu@mxic.com.tw>,
	Jaime Liao <jaimeliao@mxic.com.tw>,
	Jaime Liao <jaimeliao.tw@gmail.com>,
	Alvin Zhou <alvinzhou@mxic.com.tw>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Michal Simek <monstr@monstr.eu>,
	<linux-arm-kernel@lists.infradead.org>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v4 6/8] mtd: spi-nor: Add a RWW flag
Date: Wed,  1 Feb 2023 12:36:01 +0100	[thread overview]
Message-ID: <20230201113603.293758-7-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20230201113603.293758-1-miquel.raynal@bootlin.com>

Introduce a new (no SFDP) flag for the feature that we are about to
support: Read While Write. This means, if the chip has several banks and
supports RWW, once a page of data to write has been transferred into the
chip's internal SRAM, another read operation happening on a different
bank can be performed during the tPROG delay.

Adding this new flag involves enlarging the no_sfdp_flags variable to 16
bits.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/mtd/spi-nor/core.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 888a08c37d8c..aebd92f4884f 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -473,6 +473,7 @@ struct spi_nor_fixups {
  *   SPI_NOR_OCTAL_READ:      flash supports Octal Read.
  *   SPI_NOR_OCTAL_DTR_READ:  flash supports octal DTR Read.
  *   SPI_NOR_OCTAL_DTR_PP:    flash supports Octal DTR Page Program.
+ *   SPI_NOR_RWW:             flash supports reads while write.
  *
  * @fixup_flags:    flags that indicate support that can be discovered via SFDP
  *                  ideally, but can not be discovered for this particular flash
@@ -514,7 +515,7 @@ struct flash_info {
 #define SPI_NOR_NO_FR			BIT(8)
 #define SPI_NOR_QUAD_PP			BIT(9)
 
-	u8 no_sfdp_flags;
+	u16 no_sfdp_flags;
 #define SPI_NOR_SKIP_SFDP		BIT(0)
 #define SECT_4K				BIT(1)
 #define SPI_NOR_DUAL_READ		BIT(3)
@@ -522,6 +523,7 @@ struct flash_info {
 #define SPI_NOR_OCTAL_READ		BIT(5)
 #define SPI_NOR_OCTAL_DTR_READ		BIT(6)
 #define SPI_NOR_OCTAL_DTR_PP		BIT(7)
+#define SPI_NOR_RWW			BIT(8)
 
 	u8 fixup_flags;
 #define SPI_NOR_4B_OPCODES		BIT(0)
-- 
2.34.1


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
