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Commit c9d79c4b authored Aug 05, 2014 by Gerhard Sittig Committed by Brian Norris Nov 04, 2014

mtd: nand: gpio: improve comments about GPIO assisted operation



The drivers/mtd/nand/gpio.c driver does not GPIO bitbang the complete
NAND protocol, but instead is GPIO _assisted_ -- a memory mapped interface
communicates commands and data, and only few control signals are connected
to GPIO pins.

Expand comments in the driver source and in the Kconfig description to
better reflect the very nature of the driver.  The previous text could be
mistaken for complete GPIO bitbanging.

Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

parent f861a925

drivers/mtd/nand/Kconfig

+4 −2

Original line number	Diff line number	Diff line
		@@ -75,10 +75,12 @@ config MTD_NAND_DENALI_SCRATCH_REG_ADDR
		boards, the scratch register is at 0xFF108018.

		config MTD_NAND_GPIO
		tristate "GPIO NAND Flash driver"
		tristate "GPIO assisted NAND Flash driver"
		depends on GPIOLIB
		help
		This enables a GPIO based NAND flash driver.
		This enables a NAND flash driver where control signals are
		connected to GPIO pins, and commands and data are communicated
		via a memory mapped interface.

		config MTD_NAND_AMS_DELTA
		tristate "NAND Flash device on Amstrad E3"

drivers/mtd/nand/gpio.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -8,7 +8,9 @@
		*
		* © 2004 Simtec Electronics
		*
		* Device driver for NAND connected via GPIO
		* Device driver for NAND flash that uses a memory mapped interface to
		* read/write the NAND commands and data, and GPIO pins for control signals
		* (the DT binding refers to this as "GPIO assisted NAND flash")
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as