[PATCH] ARM: at91: dts: sama5d3/sama5d4: reduce NFC command registers memory region

[boris.brezillon@free-electrons.com (Boris Brezillon)]

Hi Josh,

On Thu, 15 Jan 2015 17:59:15 +0800
Josh Wu <josh.wu@atmel.com> wrote:

> Hi? Boris
> 
> Thanks for the review.
> 
> On 1/15/2015 4:45 PM, Boris Brezillon wrote:
> > Hi Josh,
> >
> > On Thu, 15 Jan 2015 15:08:03 +0800
> > Josh Wu <josh.wu@atmel.com> wrote:
> >
> >> To get NFC status, we need to read the NFC command registers, which is a
> >> 256M memory mapping address. To check the status, you just read such
> >> address from NFC command registers.
> >> For example, to check NFCBUSY (bit 27), you need to read 0x08000000
> >> (bit 27 is set to 1) of the NFC command register.
> >> If you want to check NFCBUSY (bit 27) and NFCWR (bit 26) in same time,
> >> you need to read 0x0c000000 (bit 27 and bit 26 are set to 1).
> > Are NFCBUSY and NFCWR found in NFCDATA_STATUS and those found in HSMC_SR
> > representing the same thing.
> yes. it is. I just check with IP team. The NFCBUSY of NFCDATA_STATUS is 
> also refer to NFC_BUSY of HSMC_SR.
> 
> > If they are, I think you can just use HSMC_SR instead of NFCDATA_STATUS
> > to check the status [1] and drop the last bit in the NFC Command
> > Resgiters range.
> Thank you. your code works (just need some typo change).
> I want to send [1] code with your signed-off and my acked to mtd list.
> Is it okay for you?

Sure, no problem.



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com