linux-kernel - Re: [PATCH 07/11] irqchip: stm32: add stm32mp1 support with hierarchy domain

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Message-ID: <CAL_JsqLh4+vs-hQceg3bZ-ALWKE182vKbL90xxLwdgb09OtZ7Q@mail.gmail.com>
Date:   Fri, 4 May 2018 15:38:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ludovic BARRE <ludovic.barre@...com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Gerald BAEZA <gerald.baeza@...com>,
        Loic PALLARDY <loic.pallardy@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 07/11] irqchip: stm32: add stm32mp1 support with hierarchy domain

On Thu, May 3, 2018 at 4:55 AM, Ludovic BARRE <ludovic.barre@...com> wrote:
>
>
> On 05/02/2018 07:45 PM, Rob Herring wrote:
>>
>> On Wed, May 2, 2018 at 11:03 AM, Ludovic BARRE <ludovic.barre@...com>
>> wrote:
>>>
>>> Hi Rob
>>>
>>>
>>>
>>> On 05/01/2018 04:56 PM, Rob Herring wrote:
>>>>
>>>>
>>>> On Thu, Apr 26, 2018 at 06:18:30PM +0200, Ludovic Barre wrote:
>>>>>
>>>>>
>>>>> From: Ludovic Barre <ludovic.barre@...com>
>>>>>
>>>>> Exti controller has been differently integrated on stm32mp1 SoC.
>>>>> A parent irq has only one external interrupt. A hierachy domain could
>>>>> be used. Handlers are call by parent, each parent interrupt could be
>>>>> masked and unmasked according to the needs.
>>>>>
>>>>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>>>>> ---
>>>>>    .../interrupt-controller/st,stm32-exti.txt         |   3 +
>>>>>    drivers/irqchip/irq-stm32-exti.c                   | 322
>>>>> +++++++++++++++++++++
>>>>>    2 files changed, 325 insertions(+)
>>>>>
>>>>> diff --git
>>>>>
>>>>> a/Documentation/devicetree/bindings/interrupt-controller/st,stm32-exti.txt
>>>>>
>>>>> b/Documentation/devicetree/bindings/interrupt-controller/st,stm32-exti.txt
>>>>> index edf03f0..136bd61 100644
>>>>> ---
>>>>>
>>>>> a/Documentation/devicetree/bindings/interrupt-controller/st,stm32-exti.txt
>>>>> +++
>>>>>
>>>>> b/Documentation/devicetree/bindings/interrupt-controller/st,stm32-exti.txt
>>>>> @@ -5,11 +5,14 @@ Required properties:
>>>>>    - compatible: Should be:
>>>>>        "st,stm32-exti"
>>>>>        "st,stm32h7-exti"
>>>>> +    "st,stm32mp1-exti"
>>>>>    - reg: Specifies base physical address and size of the registers
>>>>>    - interrupt-controller: Indentifies the node as an interrupt
>>>>> controller
>>>>>    - #interrupt-cells: Specifies the number of cells to encode an
>>>>> interrupt
>>>>>      specifier, shall be 2
>>>>>    - interrupts: interrupts references to primary interrupt controller
>>>>> +  (only needed for exti controller with multiple exti under
>>>>> +  same parent interrupt: st,stm32-exti and st,stm32h7-exti")
>>>>>      Example:
>>>>>    diff --git a/drivers/irqchip/irq-stm32-exti.c
>>>>> b/drivers/irqchip/irq-stm32-exti.c
>>>>> index b38c655..ebf7146 100644
>>>>> --- a/drivers/irqchip/irq-stm32-exti.c
>>>>> +++ b/drivers/irqchip/irq-stm32-exti.c
>>>>
>>>>
>>>>
>>>> [...]
>>>>
>>>>> +static const struct stm32_desc_irq stm32mp1_desc_irq[] = {
>>>>> +       { .exti = 1, .irq_parent = 7 },
>>>>> +       { .exti = 2, .irq_parent = 8 },
>>>>> +       { .exti = 3, .irq_parent = 9 },
>>>>> +       { .exti = 4, .irq_parent = 10 },
>>>>> +       { .exti = 5, .irq_parent = 23 },
>>>>> +       { .exti = 6, .irq_parent = 64 },
>>>>> +       { .exti = 7, .irq_parent = 65 },
>>>>> +       { .exti = 8, .irq_parent = 66 },
>>>>> +       { .exti = 9, .irq_parent = 67 },
>>>>> +       { .exti = 10, .irq_parent = 40 },
>>>>> +       { .exti = 11, .irq_parent = 42 },
>>>>> +       { .exti = 12, .irq_parent = 76 },
>>>>> +       { .exti = 13, .irq_parent = 77 },
>>>>> +       { .exti = 14, .irq_parent = 121 },
>>>>> +       { .exti = 15, .irq_parent = 127 },
>>>>> +       { .exti = 16, .irq_parent = 1 },
>>>>> +       { .exti = 65, .irq_parent = 144 },
>>>>> +       { .exti = 68, .irq_parent = 143 },
>>>>> +       { .exti = 73, .irq_parent = 129 },
>>>>> +};
>>>>
>>>>
>>>>
>>>> You can use an interrupt-map property rather than put this into the
>>>> driver.
>>>
>>>
>>>
>>> interrupt-map seemed interesting and promising like used in pci host.
>>> At first sight this property can't be used into node with
>>> "interrupt-controller" property (see in drivers/of/irq.c function:
>>> of_irq_parse_raw) because "of_irq_parse_raw" checks if node got
>>> it first, and after lookup the interrupt-map.
>>>
>>> Rob, Thomas, Jason, Marc what do you prefers or the right ways...?
>>
>>
>> I believe the correct thing to do is simply drop "interrupt-controller".
>

Actually, that's not right.

> if I drop "interrupt-controller" of my node, my driver will not be
> initialized by "of_irq_init"
> (start_kernel->init_IRQ->irqchip_init->of_irq_init).
> Probably, we could replace "IRQCHIP_DECLARE" by a
> "module_platform_driver" or "postcore_initcall" but I'm not a big fan of
> this solution. what do you think ?

You'd have to parse 'interrupt-map' yourself to extract the data for
this to work because interrupt-map currently only works when the
translation is transparent (i.e. doesn't need s/w handling). So I
guess leave this in the driver. Sorry for the noise.

Rob