[PATCH] ARM: shmobile: alt: Add QSPI device to DT

[Geert Uytterhoeven]

Hi Simon,

On Sun, Jan 3, 2016 at 10:07 PM, Simon Horman <horms at verge.net.au> wrote:
> On Fri, Dec 18, 2015 at 11:07:23AM +0100, Geert Uytterhoeven wrote:
>> On Fri, Dec 18, 2015 at 3:54 AM, Simon Horman <horms at verge.net.au> wrote:
>> > On Tue, Dec 01, 2015 at 09:06:17AM +0100, Geert Uytterhoeven wrote:
>> >> On Tue, Dec 1, 2015 at 7:41 AM, Simon Horman <horms at verge.net.au> wrote:
>> >> > On Mon, Nov 30, 2015 at 09:34:10AM +0100, Geert Uytterhoeven wrote:
>> >> >> On Mon, Nov 30, 2015 at 7:13 AM, Simon Horman
>> >> >> <horms+renesas at verge.net.au> wrote:
>> >> >> > Enable the QSPI controller in the alt device tree.
>> >> >> >
>> >> >> > Based similar work for the silk board by by Vladimir Barinov and
>> >> >> > Sergei Shtylyov.
>> >> >> >
>> >> >> > Cc: Vladimir Barinov <vladimir.barinov at cogentembedded.com>
>> >> >> > Cc: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
>> >> >> > Signed-off-by: Simon Horman <horms+renesas at verge.net.au>
>> >> >>
>> >> >> Verified against Alt schematics and r8a7794 datasheet.
>> >> >>
>> >> >> Acked-by: Geert Uytterhoeven <geert+renesas at glider.be>
>> >> >>
>> >> >> I can't verify the FLASH layout. Note that p.11 of
>> >> >> ALT_MiniMonitor_Manual(SPI_Boot)_Rev0.01_e.pdf shows a different
>> >> >> FLASH layout for the second and third partition.
>> >> >
>> >> > Thanks. I see the following in v1.9.6 of the BSP[1]. Is it
>> >> > the same as the document you referred to above?
>> >> >
>> >> >
>> >> >                 partition at 0 {
>> >> >                         label = "loader";
>> >> >                         reg = <0x00000000 0x00080000>;
>> >> >                         read-only;
>> >> >                 };
>> >> >                 partition at 40000 {
>> >> >                         label = "user";
>> >> >                         reg = <0x00080000 0x00580000>;
>> >> >                         read-only;
>> >> >                 };
>> >> >                 partition at 440000 {
>> >> >                         label = "flash";
>> >> >                         reg = <0x00600000 0x03a00000>;
>> >> >                 };
>> >> >
>> >> >
>> >> > [1] https://git.kernel.org/cgit/linux/kernel/git/horms/renesas-backport.git/tree/arch/arm/boot/dts/r8a7794-alt.dts?h=rcar-gen2/v1.9.6&id=e1acbe074f36d96e901bf5346c50ee51da2ced42#n379
>> >>
>> >> No, the document specifies 3 partitions:
>> >>   - SA0: loader program area, 16 KiB,
>>
>> Sorry, I missed a "Not used" part after that, and started miscounting zeroes
>> on top of that :-(
>>
>> So the loader consumes 16 KiB out of the 256 KiB SA0 partition.
>>
>> >>   - SA1: System area, 16 KiB,
>>
>> Should be 256 KiB.
>>
>> >>   - SA2: User program area, remainder.
>> >>
>> >> FWIW, the unit addresses in the device nodes above are not consistent
>> >> with their reg properties.
>> >
>> > My feeling is that we should follow the documentation.
>> > Does this reflect the scheme it describes?
>> >
>> >
>> >                 partitions {
>> >                         #address-cells = <1>;
>> >                         #size-cells = <1>;
>> >
>> >                         partition at 0 {
>> >                                 label = "loader";
>> >                                 reg = <0x00000000 0x00004000>;
>>
>> reg = <0x00000000 0x00040000>;
>>
>> >                                 read-only;
>> >                         };
>> >                         partition at 4000 {
>>
>> partition at 40000
>>
>> >                                 label = "system";
>> >                                 reg = <0x00004000 0x00004000>;
>>
>> reg = <0x00040000 0x00040000>;
>>
>> >                                 read-only;
>> >                         };
>> >                         partition at 8000 {
>>
>> partition at 80000
>>
>> >                                 label = "user";
>> >                                 reg = <0x00008000 0x03ff8000>;
>>
>> reg = <0x00080000 0x03f80000>;
>>
>> >                         };
>> >                 };
>>
>> I don't have an ALT. Does this match with the actual FLASH contents?
>
> I'm a little unsure how to verify that.

Usually the FLASH is empty (all ones) at the end of each partition.

Hence "dd if=/dev/mtd0 bs=16M | hd | less" should report lots of
identical lines of
data.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds