On 03/14/2013 11:02 AM, Javier Martinez Canillas wrote: > On Thu, Mar 14, 2013 at 3:57 PM, Benoit Cousson <b-cousson@xxxxxx> wrote: >> Salut Jon, >> >> On 03/08/2013 06:27 PM, Jon Hunter wrote: >>> Various OMAP device-tree updates for PMU, DMA, GPIO, GPMC and boards. >>> >>> The DMA, PMU and OMAP3430 SDP board changes have been sent before >>> individually but re-sending here as a complete series for v3.10. >>> >>> This is based upon v3.9-rc1 and the OMAP3 GPMC binding from Florian >>> Vaussard [1] and OMAP5 DT SPI patch from Felipe Balbi [2]. >>> >>> [1] https://patchwork.kernel.org/patch/2057111/ >> >> I've tried to follow the series review, and it seems that Florian was >> considering sending some other patches. It is not clear if this is a new >> version of the series or some additional patches. >> > > Hi Benoit, > > According to [1] Jon suggested that it was not necessary to map all > the 16MB for the GPMC mapped register address space since in practice > is a very small fraction of that size is used. > > I had the following patch but I did never post it because Jon said > that the I/O memory mapping is page-aligned and the minimum page > size for ARM is 4KB anyways, so there is no functional difference > between using 0x1000 or 0x02d0. > > But now reading [2] I see that you prefer to do what the documentation > said and don't assume any the page size / alignment. > > [2]: https://patchwork.kernel.org/patch/2239741/ > > From 68edff5a102bb8fc81e006738baa456eb69f080a Mon Sep 17 00:00:00 2001 > From: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> > Date: Wed, 27 Feb 2013 02:30:51 +0100 > Subject: [PATCH] ARM: dts: OMAP3: reduce GPMC mapped registers address space > > Currently the OMAP General-Purpose Memory Controller (GPMC) device > node maps 16 MB of address space for its hardware registers. > > This is because the OMAP Technical Reference Manual says that the > GPMC module register address space size is 16 MB. But in practice > the maximum address offset used by a GPMC register is 0x02d0. > > So, there is no need to map such a big address space for GPMC regs. > > This change was suggested by Jon Hunter [1]. > > [1]: https://patchwork.kernel.org/patch/2057111/ > > Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> > --- > arch/arm/boot/dts/omap3.dtsi | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/boot/dts/omap3.dtsi b/arch/arm/boot/dts/omap3.dtsi > index 2ddae38..a60eaf1 100644 > --- a/arch/arm/boot/dts/omap3.dtsi > +++ b/arch/arm/boot/dts/omap3.dtsi > @@ -407,7 +407,7 @@ > gpmc: gpmc@6e000000 { > compatible = "ti,omap3430-gpmc"; > ti,hwmods = "gpmc"; > - reg = <0x6e000000 0x1000000>; > + reg = <0x6e000000 0x02d0>; > interrupts = <20>; > gpmc,num-cs = <8>; > gpmc,num-waitpins = <4>; > Thanks! Acked-by: Jon Hunter <jon-hunter@xxxxxx> Cheers Jon -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
