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Date: Thu, 24 Nov 2022 08:36:03 +0000
From: Rahul Tanwar <rtanwar@...linear.com>
To: Rob Herring <robh@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
linux-lgm-soc <linux-lgm-soc@...linear.com>,
"andriy.shevchenko@...ux.intel.com"
<andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v4 1/4] dt-bindings: x86: apic: Convert Intel's APIC
bindings to YAML schema
On 24/11/2022 5:28 am, Rob Herring wrote:
> This email was sent from outside of MaxLinear.
>
> On Wed, Nov 23, 2022 at 06:08:47PM +0800, Rahul Tanwar wrote:
> > Intel's APIC family of interrupt controllers support local APIC
> > (lapic) & I/O APIC (ioapic). Convert existing bindings for lapic
> > & ioapic from text to YAML schema. Separate lapic & ioapic schemas.
> > Addditionally, add description which was missing in text file and
> > add few more required standard properties which were also missing
> > in text file.
> >
> > Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Signed-off-by: Rahul Tanwar <rtanwar@...linear.com>
> > ---
> > .../intel,ce4100-ioapic.txt | 26 --------
> > .../intel,ce4100-ioapic.yaml | 62 +++++++++++++++++++
> > .../intel,ce4100-lapic.yaml | 49 +++++++++++++++
> > 3 files changed, 111 insertions(+), 26 deletions(-)
> > delete mode 100644
> Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.txt
> > create mode 100644
> Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.yaml
> > create mode 100644
> Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-lapic.yaml
> >
> > diff --git
> a/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.txt b/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.txt
> > deleted file mode 100644
> > index 7d19f494f19a..000000000000
> > ---
> a/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.txt
> > +++ /dev/null
> > @@ -1,26 +0,0 @@
> > -Interrupt chips
> > ----------------
> > -
> > -* Intel I/O Advanced Programmable Interrupt Controller (IO APIC)
> > -
> > - Required properties:
> > - --------------------
> > - compatible = "intel,ce4100-ioapic";
> > - #interrupt-cells = <2>;
> > -
> > - Device's interrupt property:
> > -
> > - interrupts = <P S>;
> > -
> > - The first number (P) represents the interrupt pin which is wired to the
> > - IO APIC. The second number (S) represents the sense of interrupt which
> > - should be configured and can be one of:
> > - 0 - Edge Rising
> > - 1 - Level Low
> > - 2 - Level High
> > - 3 - Edge Falling
> > -
> > -* Local APIC
> > - Required property:
> > -
> > - compatible = "intel,ce4100-lapic";
> > diff --git
> a/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.yaml b/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.yaml
> > new file mode 100644
> > index 000000000000..25d549220c2a
> > --- /dev/null
> > +++
> b/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-ioapic.yaml
> > @@ -0,0 +1,62 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id:
> "http://devicetree.org/schemas/interrupt-controller/intel,ce4100-ioapic.yaml# <http://devicetree.org/schemas/interrupt-controller/intel,ce4100-ioapic.yaml#>"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#
> <http://devicetree.org/meta-schemas/core.yaml#>"
> > +
> > +title: Intel I/O Advanced Programmable Interrupt Controller (IO APIC)
> > +
> > +maintainers:
> > + - Rahul Tanwar <rtanwar@...linear.com>
> > +
> > +
>
> One blank line.
Well noted.
>
> > +description: |
> > + Intel's Advanced Programmable Interrupt Controller (APIC) is a
> > + family of interrupt controllers. The APIC is a split
> > + architecture design, with a local component (LAPIC) integrated
> > + into the processor itself and an external I/O APIC. Local APIC
> > + (lapic) receives interrupts from the processor's interrupt pins,
> > + from internal sources and from an external I/O APIC (ioapic).
> > + And it sends these to the processor core for handling.
> > + See [1] Chapter 8 for more details.
> > +
> > + Many of the Intel's generic devices like hpet, ioapic, lapic have
> > + the ce4100 name in their compatible property names because they
> > + first appeared in CE4100 SoC.
> > +
> > + This schema defines bindings for I/O APIC interrupt controller.
> > +
> > + [1] https://pdos.csail.mit.edu/6.828/2008/readings/ia32/IA32-3A.pdf
> <https://pdos.csail.mit.edu/6.828/2008/readings/ia32/IA32-3A.pdf>
> > +
> > +properties:
> > + compatible:
> > + const: intel,ce4100-ioapic
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupt-controller: true
> > +
> > + '#interrupt-cells':
> > + const: 2
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupt-controller
> > + - '#interrupt-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + ioapic1: interrupt-controller@...00000 {
> > + compatible = "intel,ce4100-ioapic";
> > + reg = <0xfec00000 0x1000>;
> > + #interrupt-cells = <2>;
> > + #address-cells = <0>;
> > + interrupt-controller;
> > + };
> > diff --git
> a/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-lapic.yaml b/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-lapic.yaml
> > new file mode 100644
> > index 000000000000..88f320ef4616
> > --- /dev/null
> > +++
> b/Documentation/devicetree/bindings/interrupt-controller/intel,ce4100-lapic.yaml
> > @@ -0,0 +1,49 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id:
> "http://devicetree.org/schemas/interrupt-controller/intel,ce4100-lapic.yaml# <http://devicetree.org/schemas/interrupt-controller/intel,ce4100-lapic.yaml#>"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#
> <http://devicetree.org/meta-schemas/core.yaml#>"
> > +
> > +title: Intel Local Advanced Programmable Interrupt Controller (LAPIC)
> > +
> > +maintainers:
> > + - Rahul Tanwar <rtanwar@...linear.com>
> > +
> > +
> > +description: |
> > + Intel's Advanced Programmable Interrupt Controller (APIC) is a
> > + family of interrupt controllers. The APIC is a split
> > + architecture design, with a local component (LAPIC) integrated
> > + into the processor itself and an external I/O APIC. Local APIC
> > + (lapic) receives interrupts from the processor's interrupt pins,
> > + from internal sources and from an external I/O APIC (ioapic).
> > + And it sends these to the processor core for handling.
> > + See [1] Chapter 8 for more details.
> > +
> > + Many of the Intel's generic devices like hpet, ioapic, lapic have
> > + the ce4100 name in their compatible property names because they
> > + first appeared in CE4100 SoC.
> > +
> > + This schema defines bindings for local APIC interrupt controller.
> > +
> > + [1] https://pdos.csail.mit.edu/6.828/2008/readings/ia32/IA32-3A.pdf
> <https://pdos.csail.mit.edu/6.828/2008/readings/ia32/IA32-3A.pdf>
> > +
> > +properties:
> > + compatible:
> > + const: intel,ce4100-lapic
> > +
> > + reg:
> > + maxItems: 1
> > +
> > +required:
> > + - compatible
> > + - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + lapic0: interrupt-controller@...00000 {
> > + compatible = "intel,ce4100-lapic";
> > + reg = <0xfee00000 0x1000>;
>
> What about interrupt-controller and #interrupt-cells properties?
Thanks for pointing it out. Yes, interrupt-controller & #interrupt-cells
properties rightfully belong here. Will update in v5. Thanks.
Regards,
Rahul
>
> > + };
> > --
> > 2.17.1
> >
> >
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