linux-kernel - Re: [PATCH v2 1/2] dt-bindings: reset: Add YAML schemas for the Intel Reset controller

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Date:   Wed, 28 Aug 2019 10:59:33 +0800
From:   Dilip Kota <eswara.kota@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        cheol.yong.kim@...el.com, chuanhua.lei@...ux.intel.com,
        qi-ming.wu@...el.com
Subject: Re: [PATCH v2 1/2] dt-bindings: reset: Add YAML schemas for the Intel
 Reset controller

Hi Rob,

On 8/27/2019 10:04 PM, Dilip Kota wrote:
> Hi Rob,
>
> On 8/26/2019 7:23 PM, Rob Herring wrote:
>> On Mon, Aug 26, 2019 at 4:52 AM Dilip Kota 
>> <eswara.kota@...ux.intel.com> wrote:
>>> Hi Rob,
>>>
>>> On 8/23/2019 8:25 PM, Rob Herring wrote:
>>>> On Fri, Aug 23, 2019 at 12:28 AM Dilip Kota 
>>>> <eswara.kota@...ux.intel.com> wrote:
>>>>> Add YAML schemas for the reset controller on Intel
>>>>> Lightening Mountain (LGM) SoC.
>>>>>
>>>>> Signed-off-by: Dilip Kota <eswara.kota@...ux.intel.com>
>>>>> ---
>>>>> Changes on v2:
>>>>>       Address review comments
>>>>>         Update the compatible property definition
>>>>>         Add description for reset-cells
>>>>>         Add 'additionalProperties: false' property
>>>>>
>>>>>    .../bindings/reset/intel,syscon-reset.yaml         | 53 
>>>>> ++++++++++++++++++++++
>>>>>    1 file changed, 53 insertions(+)
>>>>>    create mode 100644 
>>>>> Documentation/devicetree/bindings/reset/intel,syscon-reset.yaml
>>>>>
>>>>> diff --git 
>>>>> a/Documentation/devicetree/bindings/reset/intel,syscon-reset.yaml 
>>>>> b/Documentation/devicetree/bindings/reset/intel,syscon-reset.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..3403a967190a
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/reset/intel,syscon-reset.yaml
>>>>> @@ -0,0 +1,53 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/reset/intel,syscon-reset.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: Intel Lightening Mountain SoC System Reset Controller
>>>>> +
>>>>> +maintainers:
>>>>> +  - Dilip Kota <eswara.kota@...ux.intel.com>
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    items:
>>>>> +      - const: intel,rcu-lgm
>>>>> +      - const: syscon
>>>>> +
>>>>> +  reg:
>>>>> +    description: Reset controller register base address and size
>>>>> +
>>>>> +  intel,global-reset:
>>>>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>>>>> +    description: Global reset register offset and bit offset.
>>>>> +
>>>>> +  "#reset-cells":
>>>>> +    const: 2
>>>>> +    description: |
>>>>> +      The 1st cell is the register offset.
>>>>> +      The 2nd cell is the bit offset in the register.
>>>>> +
>>>>> +required:
>>>>> +  - compatible
>>>>> +  - reg
>>>>> +  - intel,global-reset
>>>>> +  - "#reset-cells"
>>>>> +
>>>>> +additionalProperties: false
>>>>> +
>>>>> +examples:
>>>>> +  - |
>>>>> +    rcu0: reset-controller@...00000 {
>>>>> +        compatible = "intel,rcu-lgm", "syscon";
>>>>> +        reg = <0x000000 0x80000>;
>>>>> +        intel,global-reset = <0x10 30>;
>>>>> +        #reset-cells = <2>;
>>>>> +    };
>>>>> +
>>>>> +    pcie_phy0: pciephy@... {
>>>>> +        ...
>>>> You need to run 'make dt_binding_check' and fix the warnings. The
>>>> example has to be buildable and it is not.
>>> Sure, i  will correct this pcie_phy0 node. But i didn't get any 
>>> warnings
>>> for make dt_binding_check
>>>
>>>     CHKDT 
>>> Documentation/devicetree/bindings/reset/intel,syscon-reset.yaml
>>> DTC Documentation/devicetree/bindings/arm/renesas.example.dt.yaml
>>> FATAL ERROR: Unknown output format "yaml"
>>>
>>> Will DTC report about the example node errors? But, DTC is failing with
>>> FATAL_ERROR.
>>> I tried it even after installing libyaml and headers in my local
>>> directory and export the path, but no luck.(ref:
>>> https://lkml.org/lkml/2018/12/3/951)
>>> Could you please let me know if i miss anything and help me to proceed
>>> further.
>> See Documentation/devicetree/writing-schema.md
>
> I have followed all the steps mentioned in the document before keeping 
> the mail itself.
> Does the dtc script looks for libyaml and its header files at any 
> default or specific location?
DTC is working for me now.
It is working for me after updating the libyaml and header paths in 
scripts/dtc/Makefile and yamltree.c (since i have installed libyaml and 
header files in my local directories)

I have fixed all the warnings and DTC checks are successful. I will push 
the changes in the next patch version.
   DTC 
Documentation/devicetree/bindings/reset/intel,syscon-reset.example.dt.yaml
   CHECK 
Documentation/devicetree/bindings/reset/intel,syscon-reset.example.dt.yaml

Regards,
Dilip