Message-ID: <0A01E9A3-7CFA-415B-B862-2D94990BA169@aosc.io>
Date:   Mon, 05 Jun 2017 15:56:21 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <marc.zyngier@....com>,
        Chen-Yu Tsai <wens@...e.org>
CC:     devicetree <devicetree@...r.kernel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Lee Jones <lee.jones@...aro.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [linux-sunxi] Re: [PATCH v6 2/9] irqchip/sunxi-nmi: add support for the NMI in A64 R_INTC



于 2017年6月5日 GMT+08:00 下午3:53:50, Marc Zyngier <marc.zyngier@....com> 写到:
>On 05/06/17 06:57, Chen-Yu Tsai wrote:
>> Hi Marc,
>> 
>> On Mon, May 22, 2017 at 10:25 PM, Chen-Yu Tsai <wens@...e.org> wrote:
>>> On Mon, May 22, 2017 at 5:41 PM, Icenowy Zheng <icenowy@...c.io>
>wrote:
>>>>
>>>>
>>>> 于 2017年5月22日 GMT+08:00 下午5:39:22, Marc Zyngier
><marc.zyngier@....com> 写到:
>>>>> On 18/05/17 08:16, Icenowy Zheng wrote:
>>>>>> Add support for the newly imported compatible for the A64 R_INTC
>in
>>>>>> irq-sunxi-nmi driver.
>>>>>>
>>>>>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>>>>>> ---
>>>>>> Changes in v5:
>>>>>> - Fix A64 R_INTC compatible.
>>>>>>
>>>>>>  drivers/irqchip/irq-sunxi-nmi.c | 13 +++++++++++++
>>>>>>  1 file changed, 13 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/irqchip/irq-sunxi-nmi.c
>>>>> b/drivers/irqchip/irq-sunxi-nmi.c
>>>>>> index 668730c5cb66..5559c1d593bf 100644
>>>>>> --- a/drivers/irqchip/irq-sunxi-nmi.c
>>>>>> +++ b/drivers/irqchip/irq-sunxi-nmi.c
>>>>>> @@ -56,6 +56,12 @@ static struct sunxi_sc_nmi_reg_offs
>sun9i_reg_offs
>>>>> = {
>>>>>>      .enable = 0x04,
>>>>>>  };
>>>>>>
>>>>>> +static struct sunxi_sc_nmi_reg_offs sun50i_reg_offs = {
>>>>>> +    .ctrl   = 0x0c,
>>>>>> +    .pend   = 0x10,
>>>>>> +    .enable = 0x40,
>>>>>> +};
>>>>>> +
>>>>>
>>>>> Magic values? Even if no #define is provided, a pointer to the
>>>>> corresponding documentation would be appreciated (assuming
>>>>> documentation
>>>>> exists).
>>>>
>>>> No documents is available for A64 R_INTC.
>>>
>>> No code either. In Allwinner's BSP, the interrupts for the PMICs go
>>> through the (closed source) OpenRISC firmware, so there's no driver
>>> for it in the kernel.
>>>
>>> The registers line up with the old interrupt controller from the
>A10,
>>> but it seems only the NMI interrupt is wired up.
>> 
>> Is this OK? Or do you want Icenowy to respin a version with defines?
>
>Ideally, I'd like to see some #defines, but given that the rest of the
>file is already littered with hard-coded constants, you might as well
>do
>the whole thing in a subsequent patch that I would merge with these two
>patches.

Personally I think the values are self-explained (the variable
name) and used only once in this structure.

Making defines doesn't make the code more clear.

>
>>>>>
>>>>>>  static inline void sunxi_sc_nmi_write(struct irq_chip_generic
>*gc,
>>>>> u32 off,
>>>>>>                                    u32 val)
>>>>>>  {
>>>>>> @@ -220,3 +226,10 @@ static int __init sun9i_nmi_irq_init(struct
>>>>> device_node *node,
>>>>>>      return sunxi_sc_nmi_irq_init(node, &sun9i_reg_offs);
>>>>>>  }
>>>>>>  IRQCHIP_DECLARE(sun9i_nmi, "allwinner,sun9i-a80-nmi",
>>>>> sun9i_nmi_irq_init);
>>>>>> +
>>>>>> +static int __init sun50i_nmi_irq_init(struct device_node *node,
>>>>>> +                                 struct device_node *parent)
>>>>>> +{
>>>>>> +    return sunxi_sc_nmi_irq_init(node, &sun50i_reg_offs);
>>>>>> +}
>>>>>> +IRQCHIP_DECLARE(sun50i_nmi, "allwinner,sun50i-a64-r-intc",
>>>>> sun50i_nmi_irq_init);
>>>>>>
>>>>>
>>>>> Apart from the above:
>>>>>
>>>>> Acked-by: Marc Zyngier <marc.zyngier@....com>
>>>>>
>>>>> Let me know how you want this to be merged.
>> 
>> This, and the previous dt bindings patch, can be merged through
>whatever
>> tree irqchip drivers are merged through. Is that Jason's irqchip
>tree?
>
>I'll probably start pushing a branch with all the irqchip patches I've
>collected at some point this week, for Thomas to take into 4.13.
>
>Thanks,
>
>	M.
>-- 
>Jazz is not dead. It just smells funny...
>
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