From: Vignesh Raghavendra <vigneshr@ti.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: Marek Vasut <marek.vasut@gmail.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Tomer Maimon <tmaimon77@gmail.com>,
Boris Brezillon <bbrezillon@kernel.org>
Subject: [PATCH v4 0/3] Merge m25p80 into spi-nor
Date: Thu, 1 Aug 2019 21:52:26 +0530 [thread overview]
Message-ID: <20190801162229.28897-1-vigneshr@ti.com> (raw)
This is repost of patch 6 and 7 split from from Boris Brezillon's X-X-X
mode support series[1]
Background from cover letter for RFC[1]:
m25p80 is just a simple SPI NOR controller driver (a wrapper around the
SPI mem API). Not only it shouldn't be named after a specific SPI NOR
chip, but it also doesn't deserve a specific driver IMO, especially if
the end goal is to get rid of SPI NOR controller drivers found in
drivers/mtd/spi-nor/ and replace them by SPI mem drivers (which would
be placed in drivers/spi/). With this solution, we declare the SPI NOR
driver as a spi_mem_driver, just like the SPI NAND layer is declared as
a spi_mem driver (patch 1/2).
This solution also allows us to check at a fined-grain level (thanks to
the spi_mem_supports_op() function) which operations are supported and
which ones are not, while the original m25p80 logic was basing this
decision on the SPI_{RX,TX}_{DUAL,QUAD,OCTO} flags only (patch 2/2).
[1] https://patchwork.ozlabs.org/cover/982926/
Tested on TI' DRA7xx EVM with TI QSPI controller (a spi-mem driver) with
DMA (s25fl256) flash. I don't see any performance regression due to
bounce buffer copy introduced by this series
Also tested with cadence-quadspi (a spi-nor driver) driver
Boris Brezillon (2):
mtd: spi-nor: Move m25p80 code in spi-nor.c
mtd: spi-nor: Rework hwcaps selection for the spi-mem case
Vignesh Raghavendra (1):
mtd: spi-nor: always use bounce buffer for register read/writes
drivers/mtd/devices/Kconfig | 18 -
drivers/mtd/devices/Makefile | 1 -
drivers/mtd/devices/m25p80.c | 347 ---------------
drivers/mtd/spi-nor/Kconfig | 2 +
drivers/mtd/spi-nor/spi-nor.c | 806 +++++++++++++++++++++++++++++++---
include/linux/mtd/spi-nor.h | 24 +-
6 files changed, 773 insertions(+), 425 deletions(-)
delete mode 100644 drivers/mtd/devices/m25p80.c
--
2.22.0
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next reply other threads:[~2019-08-01 16:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 16:22 Vignesh Raghavendra [this message]
2019-08-01 16:22 ` [PATCH v4 1/3] mtd: spi-nor: always use bounce buffer for register read/writes Vignesh Raghavendra
2019-08-05 9:06 ` Tudor.Ambarus
2019-08-05 10:38 ` Vignesh Raghavendra
2019-08-05 11:24 ` Tudor.Ambarus
2019-08-01 16:22 ` [PATCH v4 2/3] mtd: spi-nor: Move m25p80 code in spi-nor.c Vignesh Raghavendra
2019-08-05 10:25 ` Tudor.Ambarus
2019-08-05 11:10 ` Vignesh Raghavendra
2019-08-05 11:51 ` Tudor.Ambarus
2019-08-05 12:31 ` Vignesh Raghavendra
2019-08-01 16:22 ` [PATCH v4 3/3] mtd: spi-nor: Rework hwcaps selection for the spi-mem case Vignesh Raghavendra
2019-08-05 17:45 ` Tudor.Ambarus
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