[PATCH V2 0/2] Loongson: irqchip: Add loongson-eiointc DT init support

[PATCH V2 0/2] Loongson: irqchip: Add loongson-eiointc DT init support

[Binbin Zhou]

Hi all:

Add EIOINTC irqchip DT support, which is needed for Loongson chips
that are DT-based and support EIOINTC, such as the Loongson-2K0500 SOC.

We need to handle the "parent_irq" and "eio-num-vecs" parameters passed
from DTS.

Thanks.

---
V2:
- Add the dt-bindings file (1/2);
- patch(2/2)
  - Remove forgotten debugging messages;
  - Rename properties name: "vec_count"->"loongson,eio-num-vecs";
  - Change compatible string name to "loongson,eiointc-1.0".

Binbin Zhou (2):
  dt-bindings: interrupt-controller: Add Loongson EIOINTC
  irqchip/loongson-eiointc: Add DT init support

 .../loongson,eiointc.yaml                     |  80 ++++++++++++
 drivers/irqchip/irq-loongson-eiointc.c        | 119 +++++++++++++-----
 2 files changed, 165 insertions(+), 34 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml

-- 
2.39.0

[PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Binbin Zhou]

Add Loongson Extended I/O Interrupt controller binding with DT schema
format using json-schema.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
 .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
new file mode 100644
index 000000000000..88580297f955
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Loongson Extended I/O Interrupt Controller
+
+maintainers:
+  - Binbin Zhou <zhoubinbin@loongson.cn>
+
+description: |
+  This interrupt controller is found on the Loongson-3 family chips and
+  Loongson-2K0500 chip and is used to distribute interrupts directly to
+  individual cores without forwarding them through the HT's interrupt line.
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - loongson,eiointc-1.0
+
+  reg:
+    minItems: 1
+    maxItems: 3
+
+  interrupt-controller: true
+
+  interrupts:
+    description:
+      Interrupt source of the CPU interrupts.
+
+  interrupt-names:
+    description:
+      List of names for the parent interrupts.
+    items:
+      - const: int0
+
+  '#interrupt-cells':
+    const: 1
+
+  'loongson,eio-num-vecs':
+    description:
+      The number of devices supported by the extended I/O interrupt vector.
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 1
+    maximum: 256
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+  - 'loongson,eio-num-vecs'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    eiointc: interrupt-controller@1fe11600 {
+      compatible = "loongson,eiointc-1.0";
+      reg = <0x1fe11600 0x8
+             0x1fe11700 0x8
+             0x1fe11800 0x8>;
+
+      interrupt-controller;
+      #interrupt-cells = <1>;
+
+      interrupt-parent = <&cpuintc>;
+      interrupts = <3>;
+      interrupt-names = "int0";
+
+      loongson,eio-num-vecs = <128>;
+
+    };
+
+...
-- 
2.39.0

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 13/02/2023 13:15, Binbin Zhou wrote:
> Add Loongson Extended I/O Interrupt controller binding with DT schema
> format using json-schema.
> 
> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> ---
>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> new file mode 100644
> index 000000000000..88580297f955
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"

Drop quotes from bopth.

> +
> +title: Loongson Extended I/O Interrupt Controller
> +
> +maintainers:
> +  - Binbin Zhou <zhoubinbin@loongson.cn>
> +
> +description: |
> +  This interrupt controller is found on the Loongson-3 family chips and
> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> +  individual cores without forwarding them through the HT's interrupt line.
> +
> +allOf:
> +  - $ref: /schemas/interrupt-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - loongson,eiointc-1.0

Why not using SoC based compatible? It is preferred.

> +
> +  reg:
> +    minItems: 1
> +    maxItems: 3

You need to describe the items.

> +
> +  interrupt-controller: true
> +
> +  interrupts:
> +    description:
> +      Interrupt source of the CPU interrupts.

You need to describe the items.

> +
> +  interrupt-names:
> +    description:
> +      List of names for the parent interrupts.

Drop description.

> +    items:
> +      - const: int0
> +
> +  '#interrupt-cells':
> +    const: 1
> +
> +  'loongson,eio-num-vecs':

Drop quotes.

> +    description:
> +      The number of devices supported by the extended I/O interrupt vector.

Why this cannot be inferred from the compatible? Different boards with
the same SoC support different devices?

> +    $ref: "/schemas/types.yaml#/definitions/uint32"

Drop quotes.

> +    minimum: 1
> +    maximum: 256
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-controller
> +  - '#interrupt-cells'
> +  - 'loongson,eio-num-vecs'
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    eiointc: interrupt-controller@1fe11600 {
> +      compatible = "loongson,eiointc-1.0";
> +      reg = <0x1fe11600 0x8
> +             0x1fe11700 0x8
> +             0x1fe11800 0x8>;

That's not correct syntax. <>, <>, <>

> +
> +      interrupt-controller;
> +      #interrupt-cells = <1>;
> +
> +      interrupt-parent = <&cpuintc>;
> +      interrupts = <3>;
> +      interrupt-names = "int0";
> +
> +      loongson,eio-num-vecs = <128>;
> +

Drop stray blank line.

> +    };
> +
> +...

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Binbin Zhou]

On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 13/02/2023 13:15, Binbin Zhou wrote:
> > Add Loongson Extended I/O Interrupt controller binding with DT schema
> > format using json-schema.
> >
> > Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> > ---
> >  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
> >  1 file changed, 80 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> > new file mode 100644
> > index 000000000000..88580297f955
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> > @@ -0,0 +1,80 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>
> Drop quotes from bopth.
>
> > +
> > +title: Loongson Extended I/O Interrupt Controller
> > +
> > +maintainers:
> > +  - Binbin Zhou <zhoubinbin@loongson.cn>
> > +
> > +description: |
> > +  This interrupt controller is found on the Loongson-3 family chips and
> > +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> > +  individual cores without forwarding them through the HT's interrupt line.
> > +
> > +allOf:
> > +  - $ref: /schemas/interrupt-controller.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - loongson,eiointc-1.0
>
> Why not using SoC based compatible? It is preferred.

Hi Krzysztof:

So far, from the datasheet, I know that only the EXIOINTC of the
Loongson-2K0500 is different from the other chips, and that is the
"loongson,eio-num-vecs" below, which is 128, while all the others are
256.
My original idea was to add this property to make compatible
consistent, and also to make it easier to add new chips if they have
different eio-num-vecs.

>
> > +
> > +  reg:
> > +    minItems: 1
> > +    maxItems: 3
>
> You need to describe the items.
>
> > +
> > +  interrupt-controller: true
> > +
> > +  interrupts:
> > +    description:
> > +      Interrupt source of the CPU interrupts.
>
> You need to describe the items.

Do you mean a more detailed description?

>
> > +
> > +  interrupt-names:
> > +    description:
> > +      List of names for the parent interrupts.
>
> Drop description.
>
> > +    items:
> > +      - const: int0
> > +
> > +  '#interrupt-cells':
> > +    const: 1
> > +
> > +  'loongson,eio-num-vecs':
>
> Drop quotes.
>
> > +    description:
> > +      The number of devices supported by the extended I/O interrupt vector.
>
> Why this cannot be inferred from the compatible? Different boards with
> the same SoC support different devices?

See above.

Thanks.
Binbin

>
> > +    $ref: "/schemas/types.yaml#/definitions/uint32"
>
> Drop quotes.
>
> > +    minimum: 1
> > +    maximum: 256
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - interrupt-controller
> > +  - '#interrupt-cells'
> > +  - 'loongson,eio-num-vecs'
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    eiointc: interrupt-controller@1fe11600 {
> > +      compatible = "loongson,eiointc-1.0";
> > +      reg = <0x1fe11600 0x8
> > +             0x1fe11700 0x8
> > +             0x1fe11800 0x8>;
>
> That's not correct syntax. <>, <>, <>
>
> > +
> > +      interrupt-controller;
> > +      #interrupt-cells = <1>;
> > +
> > +      interrupt-parent = <&cpuintc>;
> > +      interrupts = <3>;
> > +      interrupt-names = "int0";
> > +
> > +      loongson,eio-num-vecs = <128>;
> > +
>
> Drop stray blank line.
>
> > +    };
> > +
> > +...
>
> Best regards,
> Krzysztof
>
>

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 14/02/2023 13:40, Binbin Zhou wrote:
> On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>> On 13/02/2023 13:15, Binbin Zhou wrote:
>>> Add Loongson Extended I/O Interrupt controller binding with DT schema
>>> format using json-schema.
>>>
>>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
>>> ---
>>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
>>>  1 file changed, 80 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>> new file mode 100644
>>> index 000000000000..88580297f955
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>> @@ -0,0 +1,80 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>>
>> Drop quotes from bopth.
>>
>>> +
>>> +title: Loongson Extended I/O Interrupt Controller
>>> +
>>> +maintainers:
>>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
>>> +
>>> +description: |
>>> +  This interrupt controller is found on the Loongson-3 family chips and
>>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
>>> +  individual cores without forwarding them through the HT's interrupt line.
>>> +
>>> +allOf:
>>> +  - $ref: /schemas/interrupt-controller.yaml#
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - loongson,eiointc-1.0
>>
>> Why not using SoC based compatible? It is preferred.
> 
> Hi Krzysztof:
> 
> So far, from the datasheet, I know that only the EXIOINTC of the
> Loongson-2K0500 is different from the other chips, and that is the
> "loongson,eio-num-vecs" below, which is 128, while all the others are
> 256.
> My original idea was to add this property to make compatible
> consistent, and also to make it easier to add new chips if they have
> different eio-num-vecs.

We talk about different things. SoC based compatibles are preferred over
version ones. This was on the lists expressed many times. Please provide
a reason why you deviate from general recommendation. Flexibility and
genericness of bindings is not a reason - it's the opposite of the
argument, thus this will be a: NAK. :(


> 
>>
>>> +
>>> +  reg:
>>> +    minItems: 1
>>> +    maxItems: 3
>>
>> You need to describe the items.
>>
>>> +
>>> +  interrupt-controller: true
>>> +
>>> +  interrupts:
>>> +    description:
>>> +      Interrupt source of the CPU interrupts.
>>
>> You need to describe the items.
> 
> Do you mean a more detailed description?

I mean constraints on interrupts and/or description if they are not obvious.

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 14/02/2023 13:43, Krzysztof Kozlowski wrote:
>>
>>>
>>>> +
>>>> +  reg:
>>>> +    minItems: 1
>>>> +    maxItems: 3
>>>
>>> You need to describe the items.>>>
>>>> +
>>>> +  interrupt-controller: true
>>>> +
>>>> +  interrupts:
>>>> +    description:
>>>> +      Interrupt source of the CPU interrupts.
>>>
>>> You need to describe the items.
>>
>> Do you mean a more detailed description?
> 
> I mean constraints on interrupts and/or description if they are not obvious.


Actually I noticed that for interrupts you provided the name, so it is
description and you just need maxItems:1.

The reg however need list of items which clearly documents what is there.

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Binbin Zhou]

On Tue, Feb 14, 2023 at 8:43 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 14/02/2023 13:40, Binbin Zhou wrote:
> > On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
> > <krzysztof.kozlowski@linaro.org> wrote:
> >>
> >> On 13/02/2023 13:15, Binbin Zhou wrote:
> >>> Add Loongson Extended I/O Interrupt controller binding with DT schema
> >>> format using json-schema.
> >>>
> >>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> >>> ---
> >>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
> >>>  1 file changed, 80 insertions(+)
> >>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>> new file mode 100644
> >>> index 000000000000..88580297f955
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>> @@ -0,0 +1,80 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> >>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> >>
> >> Drop quotes from bopth.
> >>
> >>> +
> >>> +title: Loongson Extended I/O Interrupt Controller
> >>> +
> >>> +maintainers:
> >>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
> >>> +
> >>> +description: |
> >>> +  This interrupt controller is found on the Loongson-3 family chips and
> >>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> >>> +  individual cores without forwarding them through the HT's interrupt line.
> >>> +
> >>> +allOf:
> >>> +  - $ref: /schemas/interrupt-controller.yaml#
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    enum:
> >>> +      - loongson,eiointc-1.0
> >>
> >> Why not using SoC based compatible? It is preferred.
> >
> > Hi Krzysztof:
> >
> > So far, from the datasheet, I know that only the EXIOINTC of the
> > Loongson-2K0500 is different from the other chips, and that is the
> > "loongson,eio-num-vecs" below, which is 128, while all the others are
> > 256.
> > My original idea was to add this property to make compatible
> > consistent, and also to make it easier to add new chips if they have
> > different eio-num-vecs.
>
> We talk about different things. SoC based compatibles are preferred over
> version ones. This was on the lists expressed many times. Please provide
> a reason why you deviate from general recommendation. Flexibility and
> genericness of bindings is not a reason - it's the opposite of the
> argument, thus this will be a: NAK. :(
>
>
Hi Krzysztof:

Allow me to give a brief overview of the current status of eiointc (DT-based):
     Loongson-3A series supports eiointc;
     Loongson-2K1000 does not support eiointc now;
     Loongson-2K0500 supports eiointc, with differences from
Loongson-3, e.g. only up to 128 devices are supported;
     Loongson-2K2000 supports eiointc, similar to Loongson-3.
     ....

As can be seen, there is now a bit of confusion in the chip's design of eiointc.

The design of eiointc is probably refined step by step with the chip.
The same version of eiointc can be used for multiple chips, and the
same chip series may also use different versions of eiointc. Low-end
chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
depending on the time it's produced.

So in the Loongson-2K series I have defined the current state as
eiointc-1.0, using the dts property to indicate the maximum number of
devices supported by eiointc that can be used directly in the driver.

If there are new changes to the design later on, such as the
definition of registers, we can call it eiointc-2.0, which can also
cover more than one chip.

Thanks.
Binbin

> >
> >>
> >>> +
> >>> +  reg:
> >>> +    minItems: 1
> >>> +    maxItems: 3
> >>
> >> You need to describe the items.
> >>
> >>> +
> >>> +  interrupt-controller: true
> >>> +
> >>> +  interrupts:
> >>> +    description:
> >>> +      Interrupt source of the CPU interrupts.
> >>
> >> You need to describe the items.
> >
> > Do you mean a more detailed description?
>
> I mean constraints on interrupts and/or description if they are not obvious.
>
> Best regards,
> Krzysztof
>

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 16/02/2023 02:46, Binbin Zhou wrote:
> On Tue, Feb 14, 2023 at 8:43 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>> On 14/02/2023 13:40, Binbin Zhou wrote:
>>> On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
>>> <krzysztof.kozlowski@linaro.org> wrote:
>>>>
>>>> On 13/02/2023 13:15, Binbin Zhou wrote:
>>>>> Add Loongson Extended I/O Interrupt controller binding with DT schema
>>>>> format using json-schema.
>>>>>
>>>>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
>>>>> ---
>>>>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
>>>>>  1 file changed, 80 insertions(+)
>>>>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..88580297f955
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>> @@ -0,0 +1,80 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
>>>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>>>>
>>>> Drop quotes from bopth.
>>>>
>>>>> +
>>>>> +title: Loongson Extended I/O Interrupt Controller
>>>>> +
>>>>> +maintainers:
>>>>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
>>>>> +
>>>>> +description: |
>>>>> +  This interrupt controller is found on the Loongson-3 family chips and
>>>>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
>>>>> +  individual cores without forwarding them through the HT's interrupt line.
>>>>> +
>>>>> +allOf:
>>>>> +  - $ref: /schemas/interrupt-controller.yaml#
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    enum:
>>>>> +      - loongson,eiointc-1.0
>>>>
>>>> Why not using SoC based compatible? It is preferred.
>>>
>>> Hi Krzysztof:
>>>
>>> So far, from the datasheet, I know that only the EXIOINTC of the
>>> Loongson-2K0500 is different from the other chips, and that is the
>>> "loongson,eio-num-vecs" below, which is 128, while all the others are
>>> 256.
>>> My original idea was to add this property to make compatible
>>> consistent, and also to make it easier to add new chips if they have
>>> different eio-num-vecs.
>>
>> We talk about different things. SoC based compatibles are preferred over
>> version ones. This was on the lists expressed many times. Please provide
>> a reason why you deviate from general recommendation. Flexibility and
>> genericness of bindings is not a reason - it's the opposite of the
>> argument, thus this will be a: NAK. :(
>>
>>
> Hi Krzysztof:
> 
> Allow me to give a brief overview of the current status of eiointc (DT-based):
>      Loongson-3A series supports eiointc;
>      Loongson-2K1000 does not support eiointc now;
>      Loongson-2K0500 supports eiointc, with differences from
> Loongson-3, e.g. only up to 128 devices are supported;
>      Loongson-2K2000 supports eiointc, similar to Loongson-3.
>      ....
> 
> As can be seen, there is now a bit of confusion in the chip's design of eiointc.
> 
> The design of eiointc is probably refined step by step with the chip.
> The same version of eiointc can be used for multiple chips, and the
> same chip series may also use different versions of eiointc. Low-end
> chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
> depending on the time it's produced.
> 
> So in the Loongson-2K series I have defined the current state as
> eiointc-1.0, using the dts property to indicate the maximum number of
> devices supported by eiointc that can be used directly in the driver.
> 
> If there are new changes to the design later on, such as the
> definition of registers, we can call it eiointc-2.0, which can also
> cover more than one chip.

Just go with SoC-based compatibles. If your version is not specific
enough, then it is not a good way to represent the hardware.

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Huacai Chen]

Hi, Krzysztof,

On Thu, Feb 16, 2023 at 4:10 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 16/02/2023 02:46, Binbin Zhou wrote:
> > On Tue, Feb 14, 2023 at 8:43 PM Krzysztof Kozlowski
> > <krzysztof.kozlowski@linaro.org> wrote:
> >>
> >> On 14/02/2023 13:40, Binbin Zhou wrote:
> >>> On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
> >>> <krzysztof.kozlowski@linaro.org> wrote:
> >>>>
> >>>> On 13/02/2023 13:15, Binbin Zhou wrote:
> >>>>> Add Loongson Extended I/O Interrupt controller binding with DT schema
> >>>>> format using json-schema.
> >>>>>
> >>>>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> >>>>> ---
> >>>>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
> >>>>>  1 file changed, 80 insertions(+)
> >>>>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>>
> >>>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>> new file mode 100644
> >>>>> index 000000000000..88580297f955
> >>>>> --- /dev/null
> >>>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>> @@ -0,0 +1,80 @@
> >>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>>>> +%YAML 1.2
> >>>>> +---
> >>>>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> >>>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> >>>>
> >>>> Drop quotes from bopth.
> >>>>
> >>>>> +
> >>>>> +title: Loongson Extended I/O Interrupt Controller
> >>>>> +
> >>>>> +maintainers:
> >>>>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
> >>>>> +
> >>>>> +description: |
> >>>>> +  This interrupt controller is found on the Loongson-3 family chips and
> >>>>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> >>>>> +  individual cores without forwarding them through the HT's interrupt line.
> >>>>> +
> >>>>> +allOf:
> >>>>> +  - $ref: /schemas/interrupt-controller.yaml#
> >>>>> +
> >>>>> +properties:
> >>>>> +  compatible:
> >>>>> +    enum:
> >>>>> +      - loongson,eiointc-1.0
> >>>>
> >>>> Why not using SoC based compatible? It is preferred.
> >>>
> >>> Hi Krzysztof:
> >>>
> >>> So far, from the datasheet, I know that only the EXIOINTC of the
> >>> Loongson-2K0500 is different from the other chips, and that is the
> >>> "loongson,eio-num-vecs" below, which is 128, while all the others are
> >>> 256.
> >>> My original idea was to add this property to make compatible
> >>> consistent, and also to make it easier to add new chips if they have
> >>> different eio-num-vecs.
> >>
> >> We talk about different things. SoC based compatibles are preferred over
> >> version ones. This was on the lists expressed many times. Please provide
> >> a reason why you deviate from general recommendation. Flexibility and
> >> genericness of bindings is not a reason - it's the opposite of the
> >> argument, thus this will be a: NAK. :(
> >>
> >>
> > Hi Krzysztof:
> >
> > Allow me to give a brief overview of the current status of eiointc (DT-based):
> >      Loongson-3A series supports eiointc;
> >      Loongson-2K1000 does not support eiointc now;
> >      Loongson-2K0500 supports eiointc, with differences from
> > Loongson-3, e.g. only up to 128 devices are supported;
> >      Loongson-2K2000 supports eiointc, similar to Loongson-3.
> >      ....
> >
> > As can be seen, there is now a bit of confusion in the chip's design of eiointc.
> >
> > The design of eiointc is probably refined step by step with the chip.
> > The same version of eiointc can be used for multiple chips, and the
> > same chip series may also use different versions of eiointc. Low-end
> > chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
> > depending on the time it's produced.
> >
> > So in the Loongson-2K series I have defined the current state as
> > eiointc-1.0, using the dts property to indicate the maximum number of
> > devices supported by eiointc that can be used directly in the driver.
> >
> > If there are new changes to the design later on, such as the
> > definition of registers, we can call it eiointc-2.0, which can also
> > cover more than one chip.
>
> Just go with SoC-based compatibles. If your version is not specific
> enough, then it is not a good way to represent the hardware.
EIOINTC is a bit like the existing LIOINTC which is already use
version to represent hardware.

Huacai
>
> Best regards,
> Krzysztof
>

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 16/02/2023 10:30, Huacai Chen wrote:
> Hi, Krzysztof,
> 
> On Thu, Feb 16, 2023 at 4:10 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>> On 16/02/2023 02:46, Binbin Zhou wrote:
>>> On Tue, Feb 14, 2023 at 8:43 PM Krzysztof Kozlowski
>>> <krzysztof.kozlowski@linaro.org> wrote:
>>>>
>>>> On 14/02/2023 13:40, Binbin Zhou wrote:
>>>>> On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
>>>>> <krzysztof.kozlowski@linaro.org> wrote:
>>>>>>
>>>>>> On 13/02/2023 13:15, Binbin Zhou wrote:
>>>>>>> Add Loongson Extended I/O Interrupt controller binding with DT schema
>>>>>>> format using json-schema.
>>>>>>>
>>>>>>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
>>>>>>> ---
>>>>>>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
>>>>>>>  1 file changed, 80 insertions(+)
>>>>>>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>>>>
>>>>>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>>>> new file mode 100644
>>>>>>> index 000000000000..88580297f955
>>>>>>> --- /dev/null
>>>>>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>>>>>>> @@ -0,0 +1,80 @@
>>>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>>>> +%YAML 1.2
>>>>>>> +---
>>>>>>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
>>>>>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>>>>>>
>>>>>> Drop quotes from bopth.
>>>>>>
>>>>>>> +
>>>>>>> +title: Loongson Extended I/O Interrupt Controller
>>>>>>> +
>>>>>>> +maintainers:
>>>>>>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
>>>>>>> +
>>>>>>> +description: |
>>>>>>> +  This interrupt controller is found on the Loongson-3 family chips and
>>>>>>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
>>>>>>> +  individual cores without forwarding them through the HT's interrupt line.
>>>>>>> +
>>>>>>> +allOf:
>>>>>>> +  - $ref: /schemas/interrupt-controller.yaml#
>>>>>>> +
>>>>>>> +properties:
>>>>>>> +  compatible:
>>>>>>> +    enum:
>>>>>>> +      - loongson,eiointc-1.0
>>>>>>
>>>>>> Why not using SoC based compatible? It is preferred.
>>>>>
>>>>> Hi Krzysztof:
>>>>>
>>>>> So far, from the datasheet, I know that only the EXIOINTC of the
>>>>> Loongson-2K0500 is different from the other chips, and that is the
>>>>> "loongson,eio-num-vecs" below, which is 128, while all the others are
>>>>> 256.
>>>>> My original idea was to add this property to make compatible
>>>>> consistent, and also to make it easier to add new chips if they have
>>>>> different eio-num-vecs.
>>>>
>>>> We talk about different things. SoC based compatibles are preferred over
>>>> version ones. This was on the lists expressed many times. Please provide
>>>> a reason why you deviate from general recommendation. Flexibility and
>>>> genericness of bindings is not a reason - it's the opposite of the
>>>> argument, thus this will be a: NAK. :(
>>>>
>>>>
>>> Hi Krzysztof:
>>>
>>> Allow me to give a brief overview of the current status of eiointc (DT-based):
>>>      Loongson-3A series supports eiointc;
>>>      Loongson-2K1000 does not support eiointc now;
>>>      Loongson-2K0500 supports eiointc, with differences from
>>> Loongson-3, e.g. only up to 128 devices are supported;
>>>      Loongson-2K2000 supports eiointc, similar to Loongson-3.
>>>      ....
>>>
>>> As can be seen, there is now a bit of confusion in the chip's design of eiointc.
>>>
>>> The design of eiointc is probably refined step by step with the chip.
>>> The same version of eiointc can be used for multiple chips, and the
>>> same chip series may also use different versions of eiointc. Low-end
>>> chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
>>> depending on the time it's produced.
>>>
>>> So in the Loongson-2K series I have defined the current state as
>>> eiointc-1.0, using the dts property to indicate the maximum number of
>>> devices supported by eiointc that can be used directly in the driver.
>>>
>>> If there are new changes to the design later on, such as the
>>> definition of registers, we can call it eiointc-2.0, which can also
>>> cover more than one chip.
>>
>> Just go with SoC-based compatibles. If your version is not specific
>> enough, then it is not a good way to represent the hardware.
> EIOINTC is a bit like the existing LIOINTC which is already use
> version to represent hardware.

Heh, so why did you go with version in compatible for liointc if it also
does not match it correctly?

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Binbin Zhou]

On Thu, Feb 16, 2023 at 4:10 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 16/02/2023 02:46, Binbin Zhou wrote:
> > On Tue, Feb 14, 2023 at 8:43 PM Krzysztof Kozlowski
> > <krzysztof.kozlowski@linaro.org> wrote:
> >>
> >> On 14/02/2023 13:40, Binbin Zhou wrote:
> >>> On Tue, Feb 14, 2023 at 5:53 PM Krzysztof Kozlowski
> >>> <krzysztof.kozlowski@linaro.org> wrote:
> >>>>
> >>>> On 13/02/2023 13:15, Binbin Zhou wrote:
> >>>>> Add Loongson Extended I/O Interrupt controller binding with DT schema
> >>>>> format using json-schema.
> >>>>>
> >>>>> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> >>>>> ---
> >>>>>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
> >>>>>  1 file changed, 80 insertions(+)
> >>>>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>>
> >>>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>> new file mode 100644
> >>>>> index 000000000000..88580297f955
> >>>>> --- /dev/null
> >>>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> >>>>> @@ -0,0 +1,80 @@
> >>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>>>> +%YAML 1.2
> >>>>> +---
> >>>>> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> >>>>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> >>>>
> >>>> Drop quotes from bopth.
> >>>>
> >>>>> +
> >>>>> +title: Loongson Extended I/O Interrupt Controller
> >>>>> +
> >>>>> +maintainers:
> >>>>> +  - Binbin Zhou <zhoubinbin@loongson.cn>
> >>>>> +
> >>>>> +description: |
> >>>>> +  This interrupt controller is found on the Loongson-3 family chips and
> >>>>> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> >>>>> +  individual cores without forwarding them through the HT's interrupt line.
> >>>>> +
> >>>>> +allOf:
> >>>>> +  - $ref: /schemas/interrupt-controller.yaml#
> >>>>> +
> >>>>> +properties:
> >>>>> +  compatible:
> >>>>> +    enum:
> >>>>> +      - loongson,eiointc-1.0
> >>>>
> >>>> Why not using SoC based compatible? It is preferred.
> >>>
> >>> Hi Krzysztof:
> >>>
> >>> So far, from the datasheet, I know that only the EXIOINTC of the
> >>> Loongson-2K0500 is different from the other chips, and that is the
> >>> "loongson,eio-num-vecs" below, which is 128, while all the others are
> >>> 256.
> >>> My original idea was to add this property to make compatible
> >>> consistent, and also to make it easier to add new chips if they have
> >>> different eio-num-vecs.
> >>
> >> We talk about different things. SoC based compatibles are preferred over
> >> version ones. This was on the lists expressed many times. Please provide
> >> a reason why you deviate from general recommendation. Flexibility and
> >> genericness of bindings is not a reason - it's the opposite of the
> >> argument, thus this will be a: NAK. :(
> >>
> >>
> > Hi Krzysztof:
> >
> > Allow me to give a brief overview of the current status of eiointc (DT-based):
> >      Loongson-3A series supports eiointc;
> >      Loongson-2K1000 does not support eiointc now;
> >      Loongson-2K0500 supports eiointc, with differences from
> > Loongson-3, e.g. only up to 128 devices are supported;
> >      Loongson-2K2000 supports eiointc, similar to Loongson-3.
> >      ....
> >
> > As can be seen, there is now a bit of confusion in the chip's design of eiointc.
> >
> > The design of eiointc is probably refined step by step with the chip.
> > The same version of eiointc can be used for multiple chips, and the
> > same chip series may also use different versions of eiointc. Low-end
> > chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
> > depending on the time it's produced.
> >
> > So in the Loongson-2K series I have defined the current state as
> > eiointc-1.0, using the dts property to indicate the maximum number of
> > devices supported by eiointc that can be used directly in the driver.
> >
> > If there are new changes to the design later on, such as the
> > definition of registers, we can call it eiointc-2.0, which can also
> > cover more than one chip.
>
> Just go with SoC-based compatibles. If your version is not specific
> enough, then it is not a good way to represent the hardware.
>

Hi Krzysztof:

I have tried to write the following  SoC-based compatibles,  is it fine?

compatible:
    enum:
      - loongson,ls3a-eiointc  # For MIPS Loongson-3A if necessary.
      - loongson,ls2k0500-eiointc
      - loongson,ls2k200-eiointc
       ....
Also remove the 'loongson,eio-num-vecs' property.

Thanks.
Binbin

> Best regards,
> Krzysztof
>

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 17/02/2023 07:09, Binbin Zhou wrote:

>>> Hi Krzysztof:
>>>
>>> Allow me to give a brief overview of the current status of eiointc (DT-based):
>>>      Loongson-3A series supports eiointc;
>>>      Loongson-2K1000 does not support eiointc now;
>>>      Loongson-2K0500 supports eiointc, with differences from
>>> Loongson-3, e.g. only up to 128 devices are supported;
>>>      Loongson-2K2000 supports eiointc, similar to Loongson-3.
>>>      ....
>>>
>>> As can be seen, there is now a bit of confusion in the chip's design of eiointc.
>>>
>>> The design of eiointc is probably refined step by step with the chip.
>>> The same version of eiointc can be used for multiple chips, and the
>>> same chip series may also use different versions of eiointc. Low-end
>>> chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
>>> depending on the time it's produced.
>>>
>>> So in the Loongson-2K series I have defined the current state as
>>> eiointc-1.0, using the dts property to indicate the maximum number of
>>> devices supported by eiointc that can be used directly in the driver.
>>>
>>> If there are new changes to the design later on, such as the
>>> definition of registers, we can call it eiointc-2.0, which can also
>>> cover more than one chip.
>>
>> Just go with SoC-based compatibles. If your version is not specific
>> enough, then it is not a good way to represent the hardware.
>>
> 
> Hi Krzysztof:
> 
> I have tried to write the following  SoC-based compatibles,  is it fine?
> 
> compatible:
>     enum:
>       - loongson,ls3a-eiointc  # For MIPS Loongson-3A if necessary.
>       - loongson,ls2k0500-eiointc
>       - loongson,ls2k200-eiointc

Looks good, but didn't you state these are compatible between each
other? I have impression there is a common set, so maybe one compatible
work on other device with reduced number of devices?

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Binbin Zhou]

On Fri, Feb 17, 2023 at 4:40 PM Krzysztof Kozlowski
<krzysztof.kozlowski@linaro.org> wrote:
>
> On 17/02/2023 07:09, Binbin Zhou wrote:
>
> >>> Hi Krzysztof:
> >>>
> >>> Allow me to give a brief overview of the current status of eiointc (DT-based):
> >>>      Loongson-3A series supports eiointc;
> >>>      Loongson-2K1000 does not support eiointc now;
> >>>      Loongson-2K0500 supports eiointc, with differences from
> >>> Loongson-3, e.g. only up to 128 devices are supported;
> >>>      Loongson-2K2000 supports eiointc, similar to Loongson-3.
> >>>      ....
> >>>
> >>> As can be seen, there is now a bit of confusion in the chip's design of eiointc.
> >>>
> >>> The design of eiointc is probably refined step by step with the chip.
> >>> The same version of eiointc can be used for multiple chips, and the
> >>> same chip series may also use different versions of eiointc. Low-end
> >>> chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
> >>> depending on the time it's produced.
> >>>
> >>> So in the Loongson-2K series I have defined the current state as
> >>> eiointc-1.0, using the dts property to indicate the maximum number of
> >>> devices supported by eiointc that can be used directly in the driver.
> >>>
> >>> If there are new changes to the design later on, such as the
> >>> definition of registers, we can call it eiointc-2.0, which can also
> >>> cover more than one chip.
> >>
> >> Just go with SoC-based compatibles. If your version is not specific
> >> enough, then it is not a good way to represent the hardware.
> >>
> >
> > Hi Krzysztof:
> >
> > I have tried to write the following  SoC-based compatibles,  is it fine?
> >
> > compatible:
> >     enum:
> >       - loongson,ls3a-eiointc  # For MIPS Loongson-3A if necessary.
> >       - loongson,ls2k0500-eiointc
> >       - loongson,ls2k200-eiointc
>
> Looks good, but didn't you state these are compatible between each
> other? I have impression there is a common set, so maybe one compatible
> work on other device with reduced number of devices?
>

So far, the difference between ls2k SOCs is the number of devices
supported by eiointc.

Do you mean use unified compatible and reuse loongson,eio-num-vecs?

Would this be possible, e.g.
compatible:
     const: loongson,ls2k-eiointc

  loongson,eio-num-vecs:
    description:
      The number of devices supported by the extended I/O interrupt vector.
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 1
    maximum: 256

Thanks.
Binbin

> Best regards,
> Krzysztof
>

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Krzysztof Kozlowski]

On 17/02/2023 11:12, Binbin Zhou wrote:
> On Fri, Feb 17, 2023 at 4:40 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org> wrote:
>>
>> On 17/02/2023 07:09, Binbin Zhou wrote:
>>
>>>>> Hi Krzysztof:
>>>>>
>>>>> Allow me to give a brief overview of the current status of eiointc (DT-based):
>>>>>      Loongson-3A series supports eiointc;
>>>>>      Loongson-2K1000 does not support eiointc now;
>>>>>      Loongson-2K0500 supports eiointc, with differences from
>>>>> Loongson-3, e.g. only up to 128 devices are supported;
>>>>>      Loongson-2K2000 supports eiointc, similar to Loongson-3.
>>>>>      ....
>>>>>
>>>>> As can be seen, there is now a bit of confusion in the chip's design of eiointc.
>>>>>
>>>>> The design of eiointc is probably refined step by step with the chip.
>>>>> The same version of eiointc can be used for multiple chips, and the
>>>>> same chip series may also use different versions of eiointc. Low-end
>>>>> chips may use eiointc-2.0, and high-end chips may use eiointc-1.0,
>>>>> depending on the time it's produced.
>>>>>
>>>>> So in the Loongson-2K series I have defined the current state as
>>>>> eiointc-1.0, using the dts property to indicate the maximum number of
>>>>> devices supported by eiointc that can be used directly in the driver.
>>>>>
>>>>> If there are new changes to the design later on, such as the
>>>>> definition of registers, we can call it eiointc-2.0, which can also
>>>>> cover more than one chip.
>>>>
>>>> Just go with SoC-based compatibles. If your version is not specific
>>>> enough, then it is not a good way to represent the hardware.
>>>>
>>>
>>> Hi Krzysztof:
>>>
>>> I have tried to write the following  SoC-based compatibles,  is it fine?
>>>
>>> compatible:
>>>     enum:
>>>       - loongson,ls3a-eiointc  # For MIPS Loongson-3A if necessary.
>>>       - loongson,ls2k0500-eiointc
>>>       - loongson,ls2k200-eiointc
>>
>> Looks good, but didn't you state these are compatible between each
>> other? I have impression there is a common set, so maybe one compatible
>> work on other device with reduced number of devices?
>>
> 
> So far, the difference between ls2k SOCs is the number of devices
> supported by eiointc.
> 
> Do you mean use unified compatible and reuse loongson,eio-num-vecs?
> 
> Would this be possible, e.g.

No. I meant that maybe all these three should have been made compatible.

Best regards,
Krzysztof

Re: [PATCH V2 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

[Rob Herring]

On Mon, Feb 13, 2023 at 08:15:27PM +0800, Binbin Zhou wrote:
> Add Loongson Extended I/O Interrupt controller binding with DT schema
> format using json-schema.
> 
> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> ---
>  .../loongson,eiointc.yaml                     | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> new file mode 100644
> index 000000000000..88580297f955
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Loongson Extended I/O Interrupt Controller
> +
> +maintainers:
> +  - Binbin Zhou <zhoubinbin@loongson.cn>
> +
> +description: |
> +  This interrupt controller is found on the Loongson-3 family chips and
> +  Loongson-2K0500 chip and is used to distribute interrupts directly to
> +  individual cores without forwarding them through the HT's interrupt line.
> +
> +allOf:
> +  - $ref: /schemas/interrupt-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - loongson,eiointc-1.0
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 3
> +
> +  interrupt-controller: true
> +
> +  interrupts:
> +    description:
> +      Interrupt source of the CPU interrupts.
> +
> +  interrupt-names:
> +    description:
> +      List of names for the parent interrupts.
> +    items:
> +      - const: int0

Why do you need this if there is only 1 interrupt?

Rob

[PATCH V2 2/2] irqchip/loongson-eiointc: Add DT init support

[Binbin Zhou]

Add EIOINTC irqchip DT support, which is needed for Loongson chips
that are DT-based and support EIOINTC, such as Loongson-2K0500 SOC.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
 drivers/irqchip/irq-loongson-eiointc.c | 119 ++++++++++++++++++-------
 1 file changed, 85 insertions(+), 34 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index d15fd38c1756..fae3660bff11 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -39,6 +39,7 @@ static int nr_pics;
 
 struct eiointc_priv {
 	u32			node;
+	u32			vec_count;
 	nodemask_t		node_map;
 	cpumask_t		cpuspan_map;
 	struct fwnode_handle	*domain_handle;
@@ -156,18 +157,18 @@ static int eiointc_router_init(unsigned int cpu)
 	if ((cpu_logical_map(cpu) % CORES_PER_EIO_NODE) == 0) {
 		eiointc_enable();
 
-		for (i = 0; i < VEC_COUNT / 32; i++) {
+		for (i = 0; i < eiointc_priv[0]->vec_count / 32; i++) {
 			data = (((1 << (i * 2 + 1)) << 16) | (1 << (i * 2)));
 			iocsr_write32(data, EIOINTC_REG_NODEMAP + i * 4);
 		}
 
-		for (i = 0; i < VEC_COUNT / 32 / 4; i++) {
+		for (i = 0; i < eiointc_priv[0]->vec_count / 32 / 4; i++) {
 			bit = BIT(1 + index); /* Route to IP[1 + index] */
 			data = bit | (bit << 8) | (bit << 16) | (bit << 24);
 			iocsr_write32(data, EIOINTC_REG_IPMAP + i * 4);
 		}
 
-		for (i = 0; i < VEC_COUNT / 4; i++) {
+		for (i = 0; i < eiointc_priv[0]->vec_count / 4; i++) {
 			/* Route to Node-0 Core-0 */
 			if (index == 0)
 				bit = BIT(cpu_logical_map(0));
@@ -178,7 +179,7 @@ static int eiointc_router_init(unsigned int cpu)
 			iocsr_write32(data, EIOINTC_REG_ROUTE + i * 4);
 		}
 
-		for (i = 0; i < VEC_COUNT / 32; i++) {
+		for (i = 0; i < eiointc_priv[0]->vec_count / 32; i++) {
 			data = 0xffffffff;
 			iocsr_write32(data, EIOINTC_REG_ENABLE + i * 4);
 			iocsr_write32(data, EIOINTC_REG_BOUNCE + i * 4);
@@ -198,7 +199,7 @@ static void eiointc_irq_dispatch(struct irq_desc *desc)
 
 	chained_irq_enter(chip, desc);
 
-	for (i = 0; i < VEC_REG_COUNT; i++) {
+	for (i = 0; i < eiointc_priv[0]->vec_count / VEC_COUNT_PER_REG; i++) {
 		pending = iocsr_read64(EIOINTC_REG_ISR + (i << 3));
 		iocsr_write64(pending, EIOINTC_REG_ISR + (i << 3));
 		while (pending) {
@@ -316,7 +317,7 @@ static void eiointc_resume(void)
 	eiointc_router_init(0);
 
 	for (i = 0; i < nr_pics; i++) {
-		for (j = 0; j < VEC_COUNT; j++) {
+		for (j = 0; j < eiointc_priv[0]->vec_count; j++) {
 			desc = irq_resolve_mapping(eiointc_priv[i]->eiointc_domain, j);
 			if (desc && desc->handle_irq && desc->handle_irq != handle_bad_irq) {
 				raw_spin_lock(&desc->lock);
@@ -373,11 +374,44 @@ static int __init acpi_cascade_irqdomain_init(void)
 	return 0;
 }
 
+static int __init eiointc_init(struct eiointc_priv *priv, int parent_irq,
+			       u64 node_map)
+{
+	int i;
+
+	node_map = node_map ? node_map : -1ULL;
+	for_each_possible_cpu(i) {
+		if (node_map & (1ULL << (cpu_to_eio_node(i)))) {
+			node_set(cpu_to_eio_node(i), priv->node_map);
+			cpumask_or(&priv->cpuspan_map, &priv->cpuspan_map,
+				   cpumask_of(i));
+		}
+	}
+
+	priv->eiointc_domain = irq_domain_create_linear(priv->domain_handle,
+							priv->vec_count,
+							&eiointc_domain_ops,
+							priv);
+	if (!priv->eiointc_domain) {
+		pr_err("loongson-extioi: cannot add IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	eiointc_priv[nr_pics++] = priv;
+	eiointc_router_init(0);
+	irq_set_chained_handler_and_data(parent_irq, eiointc_irq_dispatch, priv);
+	register_syscore_ops(&eiointc_syscore_ops);
+	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_LOONGARCH_STARTING,
+				  "irqchip/loongarch/intc:starting",
+				  eiointc_router_init, NULL);
+
+	return 0;
+}
+
 int __init eiointc_acpi_init(struct irq_domain *parent,
 				     struct acpi_madt_eio_pic *acpi_eiointc)
 {
-	int i, ret, parent_irq;
-	unsigned long node_map;
+	int parent_irq, ret;
 	struct eiointc_priv *priv;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -391,39 +425,20 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 		goto out_free_priv;
 	}
 
+	priv->vec_count = VEC_COUNT;
 	priv->node = acpi_eiointc->node;
-	node_map = acpi_eiointc->node_map ? : -1ULL;
-
-	for_each_possible_cpu(i) {
-		if (node_map & (1ULL << cpu_to_eio_node(i))) {
-			node_set(cpu_to_eio_node(i), priv->node_map);
-			cpumask_or(&priv->cpuspan_map, &priv->cpuspan_map, cpumask_of(i));
-		}
-	}
-
-	/* Setup IRQ domain */
-	priv->eiointc_domain = irq_domain_create_linear(priv->domain_handle, VEC_COUNT,
-					&eiointc_domain_ops, priv);
-	if (!priv->eiointc_domain) {
-		pr_err("loongson-eiointc: cannot add IRQ domain\n");
-		goto out_free_handle;
-	}
-
-	eiointc_priv[nr_pics++] = priv;
-
-	eiointc_router_init(0);
-
 	parent_irq = irq_create_mapping(parent, acpi_eiointc->cascade);
-	irq_set_chained_handler_and_data(parent_irq, eiointc_irq_dispatch, priv);
 
-	register_syscore_ops(&eiointc_syscore_ops);
-	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_LOONGARCH_STARTING,
-				  "irqchip/loongarch/intc:starting",
-				  eiointc_router_init, NULL);
+	ret = eiointc_init(priv, parent_irq, acpi_eiointc->node_map);
+	if (ret < 0)
+		goto out_free_handle;
 
 	acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, pch_group);
 	acpi_set_vec_parent(acpi_eiointc->node, priv->eiointc_domain, msi_group);
+
 	ret = acpi_cascade_irqdomain_init();
+	if (ret < 0)
+		goto out_free_handle;
 
 	return ret;
 
@@ -435,3 +450,39 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 
 	return -ENOMEM;
 }
+
+static int __init eiointc_of_init(struct device_node *of_node,
+				  struct device_node *parent)
+{
+	int parent_irq, ret;
+	struct eiointc_priv *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	parent_irq = of_irq_get_byname(of_node, "int0");
+	if (parent_irq <= 0) {
+		ret = -ENODEV;
+		goto out_free_priv;
+	}
+
+	ret = of_property_read_u32(of_node, "loongson,eio-num-vecs", &priv->vec_count);
+	if (ret < 0)
+		goto out_free_priv;
+
+	priv->node = 0;
+	priv->domain_handle = of_node_to_fwnode(of_node);
+
+	ret = eiointc_init(priv, parent_irq, 0);
+	if (ret < 0)
+		goto out_free_priv;
+
+	return 0;
+
+out_free_priv:
+	kfree(priv);
+	return ret;
+}
+
+IRQCHIP_DECLARE(loongson_eiointc, "loongson,eiointc-1.0", eiointc_of_init);
-- 
2.39.0

Re: [PATCH V2 0/2] Loongson: irqchip: Add loongson-eiointc DT init support

[Huacai Chen]

Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>

On Mon, Feb 13, 2023 at 8:15 PM Binbin Zhou <zhoubinbin@loongson.cn> wrote:
>
> Hi all:
>
> Add EIOINTC irqchip DT support, which is needed for Loongson chips
> that are DT-based and support EIOINTC, such as the Loongson-2K0500 SOC.
>
> We need to handle the "parent_irq" and "eio-num-vecs" parameters passed
> from DTS.
>
> Thanks.
>
> ---
> V2:
> - Add the dt-bindings file (1/2);
> - patch(2/2)
>   - Remove forgotten debugging messages;
>   - Rename properties name: "vec_count"->"loongson,eio-num-vecs";
>   - Change compatible string name to "loongson,eiointc-1.0".
>
> Binbin Zhou (2):
>   dt-bindings: interrupt-controller: Add Loongson EIOINTC
>   irqchip/loongson-eiointc: Add DT init support
>
>  .../loongson,eiointc.yaml                     |  80 ++++++++++++
>  drivers/irqchip/irq-loongson-eiointc.c        | 119 +++++++++++++-----
>  2 files changed, 165 insertions(+), 34 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
>
> --
> 2.39.0
>
>