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Subject: Re: [PATCH 07/11] irqchip: stm32: add stm32mp1 support with hierarchy
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To:     Rob Herring <robh@kernel.org>
CC:     Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Gerald BAEZA <gerald.baeza@st.com>,
        Loic PALLARDY <loic.pallardy@st.com>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>
References: <1524759514-12392-1-git-send-email-ludovic.Barre@st.com>
 <1524759514-12392-8-git-send-email-ludovic.Barre@st.com>
 <20180501145611.GA6842@rob-hp-laptop>
From:   Ludovic BARRE <ludovic.barre@st.com>
Message-ID: <6fdb652b-e7f9-7035-3eda-39f763ed7ea3@st.com>
Date:   Wed, 2 May 2018 18:03:28 +0200
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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@st.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@st.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...?

>