From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Date: Wed, 12 Nov 2014 14:54:33 -0600 Subject: [U-Boot] [PATCH 1/2] mtd: nand: omap_gpmc: Add CONFIG_SYS_NAND_USE_READY to enable ready/busy In-Reply-To: <1415789592-5192-1-git-send-email-sr@denx.de> References: <1415789592-5192-1-git-send-email-sr@denx.de> Message-ID: <1415825673.15957.41.camel@freescale.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Wed, 2014-11-12 at 11:53 +0100, Stefan Roese wrote: > By defining CONFIG_SYS_NAND_USE_READY the GPMC NAND driver makes > use of the ready pin / signal for busy / ready detection. This function > is already available but currently only used in SPL. I don't see a reason > to not use it in the main U-Boot as well. As it increases the NAND > performance. > > I'm making it configurable, so that boards that might now have this pin > connected are still supported. > > Signed-off-by: Stefan Roese > Cc: Tom Rini > Cc: Scott Wood > Cc: Roger Meier > Cc: Samuel Egli > --- > README | 5 +++++ > drivers/mtd/nand/omap_gpmc.c | 20 +++++++++++++++++--- > 2 files changed, 22 insertions(+), 3 deletions(-) > > diff --git a/README b/README > index c3a9dfc..420c14b 100644 > --- a/README > +++ b/README > @@ -4731,6 +4731,11 @@ Low Level (hardware related) configuration options: > - drivers/mtd/nand/ndfc.c > - drivers/mtd/nand/mxc_nand.c > > +- CONFIG_SYS_NAND_USE_READY > + Defined if a ready/busy pin is available on this board > + which can be used to determine the state of the NAND > + chip. Currently used on the OMAP/AM33xx NAND driver. > + New symbols should be done in kconfig. Is this really something that ought to be a generic symbol, rather than OMAP-specific? -Scott