[U-Boot] [PATCH 11/13] arm: zynq: dts: Add U-Boot device tree additions

[Michal Simek <monstr@monstr.eu>]

On 08/31/2015 03:54 PM, Simon Glass wrote:
> Hi Michal,
> 
> On 31 August 2015 at 05:30, Michal Simek <monstr@monstr.eu> 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 <sjg@chromium.org>
>>> ---
>>>
>>>  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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