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Message-ID: <20190926092055.GA15552@pi3>
Date: Thu, 26 Sep 2019 11:20:55 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kukjin Kim <kgene@...nel.org>,
Andrzej Hajda <a.hajda@...sung.com>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH v4 1/8] dt-bindings: timer: Convert Exynos MCT bindings
to json-schema
On Wed, Sep 25, 2019 at 03:40:52PM +0200, Marek Szyprowski wrote:
> Hi Krzysztof,
>
> On 23.09.2019 18:14, Krzysztof Kozlowski wrote:
> > Convert Samsung Exynos Soc Multi Core Timer bindings to DT schema format
> > using json-schema.
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> >
> > ---
> >
> > Changes since v3:
> > 1. Use interrupts-extended instead of interrupts-map.
> >
> > Changes since v1:
> > 1. Indent example with four spaces (more readable),
> > 2. Rename nodes in example to timer,
> > 3. Remove mct-map subnode.
> > ---
> > .../bindings/timer/samsung,exynos4210-mct.txt | 88 ------------
> > .../timer/samsung,exynos4210-mct.yaml | 125 ++++++++++++++++++
> > 2 files changed, 125 insertions(+), 88 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
> > create mode 100644 Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
> > deleted file mode 100644
> > index 8f78640ad64c..000000000000
> > --- a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt
> > +++ /dev/null
> > @@ -1,88 +0,0 @@
> > -Samsung's Multi Core Timer (MCT)
> > -
> > -The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
> > -global timer and CPU local timers. The global timer is a 64-bit free running
> > -up-counter and can generate 4 interrupts when the counter reaches one of the
> > -four preset counter values. The CPU local timers are 32-bit free running
> > -down-counters and generate an interrupt when the counter expires. There is
> > -one CPU local timer instantiated in MCT for every CPU in the system.
> > -
> > -Required properties:
> > -
> > -- compatible: should be "samsung,exynos4210-mct".
> > - (a) "samsung,exynos4210-mct", for mct compatible with Exynos4210 mct.
> > - (b) "samsung,exynos4412-mct", for mct compatible with Exynos4412 mct.
> > -
> > -- reg: base address of the mct controller and length of the address space
> > - it occupies.
> > -
> > -- interrupts: the list of interrupts generated by the controller. The following
> > - should be the order of the interrupts specified. The local timer interrupts
> > - should be specified after the four global timer interrupts have been
> > - specified.
> > -
> > - 0: Global Timer Interrupt 0
> > - 1: Global Timer Interrupt 1
> > - 2: Global Timer Interrupt 2
> > - 3: Global Timer Interrupt 3
> > - 4: Local Timer Interrupt 0
> > - 5: Local Timer Interrupt 1
> > - 6: ..
> > - 7: ..
> > - i: Local Timer Interrupt n
> > -
> > - For MCT block that uses a per-processor interrupt for local timers, such
> > - as ones compatible with "samsung,exynos4412-mct", only one local timer
> > - interrupt might be specified, meaning that all local timers use the same
> > - per processor interrupt.
> > -
> > -Example 1: In this example, the IP contains two local timers, using separate
> > - interrupts, so two local timer interrupts have been specified,
> > - in addition to four global timer interrupts.
> > -
> > - mct@...50000 {
> > - compatible = "samsung,exynos4210-mct";
> > - reg = <0x10050000 0x800>;
> > - interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > - <0 42 0>, <0 48 0>;
> > - };
> > -
> > -Example 2: In this example, the timer interrupts are connected to two separate
> > - interrupt controllers. Hence, an interrupt-map is created to map
> > - the interrupts to the respective interrupt controllers.
> > -
> > - mct@...c0000 {
> > - compatible = "samsung,exynos4210-mct";
> > - reg = <0x101C0000 0x800>;
> > - interrupt-parent = <&mct_map>;
> > - interrupts = <0>, <1>, <2>, <3>, <4>, <5>;
> > -
> > - mct_map: mct-map {
> > - #interrupt-cells = <1>;
> > - #address-cells = <0>;
> > - #size-cells = <0>;
> > - interrupt-map = <0 &gic 0 57 0>,
> > - <1 &gic 0 69 0>,
> > - <2 &combiner 12 6>,
> > - <3 &combiner 12 7>,
> > - <4 &gic 0 42 0>,
> > - <5 &gic 0 48 0>;
> > - };
> > - };
> > -
> > -Example 3: In this example, the IP contains four local timers, but using
> > - a per-processor interrupt to handle them. Either all the local
> > - timer interrupts can be specified, with the same interrupt specifier
> > - value or just the first one.
> > -
> > - mct@...50000 {
> > - compatible = "samsung,exynos4412-mct";
> > - reg = <0x10050000 0x800>;
> > -
> > - /* Both ways are possible in this case. Either: */
> > - interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > - <0 42 0>;
> > - /* or: */
> > - interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > - <0 42 0>, <0 42 0>, <0 42 0>, <0 42 0>;
> > - };
> > diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml
> > new file mode 100644
> > index 000000000000..bff3f54a398f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml
> > @@ -0,0 +1,125 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/timer/samsung,exynos4210-mct.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Samsung Exynos SoC Multi Core Timer (MCT)
> > +
> > +maintainers:
> > + - Krzysztof Kozlowski <krzk@...nel.org>
> > +
> > +description: |+
> > + The Samsung's Multi Core Timer (MCT) module includes two main blocks, the
> > + global timer and CPU local timers. The global timer is a 64-bit free running
> > + up-counter and can generate 4 interrupts when the counter reaches one of the
> > + four preset counter values. The CPU local timers are 32-bit free running
> > + down-counters and generate an interrupt when the counter expires. There is
> > + one CPU local timer instantiated in MCT for every CPU in the system.
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - samsung,exynos4210-mct
> > + - samsung,exynos4412-mct
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + description: |
> > + Interrupts should be put in specific order. This is, the local timer
> > + interrupts should be specified after the four global timer interrupts
> > + have been specified:
> > + 0: Global Timer Interrupt 0
> > + 1: Global Timer Interrupt 1
> > + 2: Global Timer Interrupt 2
> > + 3: Global Timer Interrupt 3
> > + 4: Local Timer Interrupt 0
> > + 5: Local Timer Interrupt 1
> > + 6: ..
> > + 7: ..
> > + i: Local Timer Interrupt n
> > + For MCT block that uses a per-processor interrupt for local timers, such
> > + as ones compatible with "samsung,exynos4412-mct", only one local timer
> > + interrupt might be specified, meaning that all local timers use the same
> > + per processor interrupt.
> > + minItems: 5 # 4 Global + 1 local
> > + maxItems: 20 # 4 Global + 16 local
> > +
> > + interrupts-extended:
> > + description: |
> > + If interrupts are coming from different controllers, this property
> > + can be used instead of regular "interrupts" property.
> > + The format is exactly the same as with "interrupts".
> > + Interrupts should be put in specific order. This is, the local timer
> > + minItems: 5 # 4 Global + 1 local
> > + maxItems: 20 # 4 Global + 16 local
> > +
> > +required:
> > + - compatible
> > + - interrupts
> > + - reg
> > +
> > +allOf:
> > + - if:
> > + not:
> > + required:
> > + - interrupts
> > + then:
> > + required:
> > + - interrupts-extended
> > +
> > +examples:
> > + - |
> > + // In this example, the IP contains two local timers, using separate
> > + // interrupts, so two local timer interrupts have been specified,
> > + // in addition to four global timer interrupts.
> > +
> > + timer@...50000 {
> > + compatible = "samsung,exynos4210-mct";
> > + reg = <0x10050000 0x800>;
> > + interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > + <0 42 0>, <0 48 0>;
> > + };
> > +
> > + - |
> > + // In this example, the timer interrupts are connected to two separate
> > + // interrupt controllers. Hence, an interrupts-extended is needed.
> > +
> > + timer@...c0000 {
> > + compatible = "samsung,exynos4210-mct";
> > + reg = <0x101C0000 0x800>;
> > + interrupts-extended = <&gic 0 57 0>,
> > + <&gic 0 69 0>,
> > + <&combiner 12 6>,
> > + <&combiner 12 7>,
> > + <&gic 0 42 0>,
> > + <&gic 0 48 0>;
> > + };
> > +
> > + - |
> > + // In this example, the IP contains four local timers, but using
> > + // a per-processor interrupt to handle them. Only one first local
> > + // interrupt is specified.
> > +
> > + timer@...50000 {
> > + compatible = "samsung,exynos4412-mct";
> > + reg = <0x10050000 0x800>;
> > +
> > + interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > + <0 42 0>;
> > + };
> > +
> > + - |
> > + // In this example, the IP contains four local timers, but using
> > + // a per-processor interrupt to handle them. All the local timer
> > + // interrupts are specified.
> > +
> > + timer@...50000 {
> > + compatible = "samsung,exynos4412-mct";
> > + reg = <0x10050000 0x800>;
> > +
> > + interrupts = <0 57 0>, <0 69 0>, <0 70 0>, <0 71 0>,
> > + <0 42 0>, <0 42 0>, <0 42 0>, <0 42 0>;
> > + };
> I would add "#include <dt-bindings/interrupt-controller/arm-gic.h>" and
> replace zeros with proper defines like GIC_SPI and GIC_PPI. The last two
> examples describes per-processor-interrupts, but have 0 in the specifier
> cell 0. I would also use proper IRQ_TYPE_LEVEL_HIGH at cell 3 instead
> of 0. I would also consider adding artificial 'interrupt-parent = &git'
> property to the 1st, 3rd and 4th examples to make it clear that they
> refer to ARM GIC bindings.
Makes sense, but how about doing this in separate patch? The example code
was like this amd this just converts the bindings so I think it is better
to reduce the amount of feature-like improvements.
Best regards,
Krzysztof
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