On 08/31/2015 03:54 PM, Simon Glass wrote: > Hi Michal, > > On 31 August 2015 at 05:30, Michal Simek <[email protected]> wrote: >> On 08/29/2015 05:10 PM, Simon Glass wrote: >>> We need to mark some device tree nodes so that they are available before >>> relocation. This enables driver model to find these automatically. In the >>> case of SPL it ensures that these nodes will be retained in SPL. >>> >>> Signed-off-by: Simon Glass <[email protected]> >>> --- >>> >>> arch/arm/dts/zynq-7000.dtsi | 1 + >>> arch/arm/dts/zynq-microzed.dts | 5 +++++ >>> arch/arm/dts/zynq-picozed.dts | 5 +++++ >>> arch/arm/dts/zynq-zc702.dts | 1 + >>> arch/arm/dts/zynq-zc706.dts | 1 + >>> arch/arm/dts/zynq-zc770-xm010.dts | 1 + >>> arch/arm/dts/zynq-zc770-xm011.dts | 1 + >>> arch/arm/dts/zynq-zc770-xm012.dts | 1 + >>> arch/arm/dts/zynq-zc770-xm013.dts | 1 + >>> arch/arm/dts/zynq-zed.dts | 1 + >>> arch/arm/dts/zynq-zybo.dts | 1 + >>> 11 files changed, 19 insertions(+) >>> >>> diff --git a/arch/arm/dts/zynq-7000.dtsi b/arch/arm/dts/zynq-7000.dtsi >>> index 0b62cb0..12614f2 100644 >>> --- a/arch/arm/dts/zynq-7000.dtsi >>> +++ b/arch/arm/dts/zynq-7000.dtsi >>> @@ -54,6 +54,7 @@ >>> }; >>> >>> amba: amba { >>> + u-boot,dm-pre-reloc; >>> compatible = "simple-bus"; >>> #address-cells = <1>; >>> #size-cells = <1>; >>> diff --git a/arch/arm/dts/zynq-microzed.dts b/arch/arm/dts/zynq-microzed.dts >>> index c373a2c..5dff18e6 100644 >>> --- a/arch/arm/dts/zynq-microzed.dts >>> +++ b/arch/arm/dts/zynq-microzed.dts >>> @@ -21,3 +21,8 @@ >>> reg = <0 0x40000000>; >>> }; >>> }; >>> + >>> +&uart1 { >>> + u-boot,dm-pre-reloc; >> >> Was this reviewed on DT mailing list? > > There is a thread going at present for Raspberry Pi but it had not > yielded much light last time I looked. > >> >> TBH adding this to every node seems to me a lot of work. > > This i how it works at present. Typically we only have a UART and that > is not necessary since U-Boot can force-bind this. But when the UART > is not in the root node we have to add something.
It is partially problem with DT mess that we have platforms with and
without bus. :-)
>
>> Why not just add one more uboot property to chosen with list of IPs
>> which needs to be relocated?
>
> You mean a list of devices needed before relocation?
I mean something like this:
chosen {
u-boot,dm-pre-reloc = <&uart1 ...>;
}
And then just go through this list. I expect that you are looking for
that property anyway.
> If you like you could look at working up a patch for this. I'm
> certainly interested in other ideas. It does need to be efficient.
I will test this series and will look at it in more details soon.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform
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