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Subject: Re: [PATCH 05/35] ARM: davinci: drop irq defines from
 default_priorites
To:     David Lechner <david@lechnology.com>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Kevin Hilman <khilman@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>
CC:     Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
References: <20190131133928.17985-1-brgl@bgdev.pl>
 <20190131133928.17985-6-brgl@bgdev.pl>
 <3038ba79-f411-9aa1-00ec-689060ed13d4@lechnology.com>
From:   Sekhar Nori <nsekhar@ti.com>
Message-ID: <21c3d8cd-f767-04bc-f4d8-3001405ffd1d@ti.com>
Date:   Wed, 6 Feb 2019 18:33:35 +0530
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On 05/02/19 3:51 AM, David Lechner wrote:
> On 1/31/19 7:38 AM, Bartosz Golaszewski wrote:
>> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>>
>> In order to select SPARSE_IRQ we need to make the interrupt numbers
>> dynamic (at least at build-time for the top-level controller). The
>> interrupt numbers are used as array indexes for irq priorities.
>>
>> Drop the defines and just initialize the arrays in a linear manner.
>>
>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>> ---
> 
> ...
> 
>> -static u8 dm355_default_priorities[DAVINCI_N_AINTC_IRQ] = {
>> -    [IRQ_DM355_CCDC_VDINT0]        = 2,
>> -    [IRQ_DM355_CCDC_VDINT1]        = 6,
>> -    [IRQ_DM355_CCDC_VDINT2]        = 6,
>> -    [IRQ_DM355_IPIPE_HST]        = 6,
>> -    [IRQ_DM355_H3AINT]        = 6,
>> -    [IRQ_DM355_IPIPE_SDR]        = 6,
>> -    [IRQ_DM355_IPIPEIFINT]        = 6,
>> -    [IRQ_DM355_OSDINT]        = 7,
>> -    [IRQ_DM355_VENCINT]        = 6,
>> -    [IRQ_ASQINT]            = 6,
>> -    [IRQ_IMXINT]            = 6,
>> -    [IRQ_USBINT]            = 4,
>> -    [IRQ_DM355_RTOINT]        = 4,
>> -    [IRQ_DM355_UARTINT2]        = 7,
>> -    [IRQ_DM355_TINT6]        = 7,
>> -    [IRQ_CCINT0]            = 5,    /* dma */
>> -    [IRQ_CCERRINT]            = 5,    /* dma */
>> -    [IRQ_TCERRINT0]            = 5,    /* dma */
>> -    [IRQ_TCERRINT]            = 5,    /* dma */
>> -    [IRQ_DM355_SPINT2_1]        = 7,
>> -    [IRQ_DM355_TINT7]        = 4,
>> -    [IRQ_DM355_SDIOINT0]        = 7,
>> -    [IRQ_MBXINT]            = 7,
>> -    [IRQ_MBRINT]            = 7,
>> -    [IRQ_MMCINT]            = 7,
>> -    [IRQ_DM355_MMCINT1]        = 7,
>> -    [IRQ_DM355_PWMINT3]        = 7,
>> -    [IRQ_DDRINT]            = 7,
>> -    [IRQ_AEMIFINT]            = 7,
>> -    [IRQ_DM355_SDIOINT1]        = 4,
>> -    [IRQ_TINT0_TINT12]        = 2,    /* clockevent */
>> -    [IRQ_TINT0_TINT34]        = 2,    /* clocksource */
>> -    [IRQ_TINT1_TINT12]        = 7,    /* DSP timer */
>> -    [IRQ_TINT1_TINT34]        = 7,    /* system tick */
>> -    [IRQ_PWMINT0]            = 7,
>> -    [IRQ_PWMINT1]            = 7,
>> -    [IRQ_PWMINT2]            = 7,
>> -    [IRQ_I2C]            = 3,
>> -    [IRQ_UARTINT0]            = 3,
>> -    [IRQ_UARTINT1]            = 3,
>> -    [IRQ_DM355_SPINT0_0]        = 3,
>> -    [IRQ_DM355_SPINT0_1]        = 3,
>> -    [IRQ_DM355_GPIO0]        = 3,
>> -    [IRQ_DM355_GPIO1]        = 7,
>> -    [IRQ_DM355_GPIO2]        = 4,
>> -    [IRQ_DM355_GPIO3]        = 4,
>> -    [IRQ_DM355_GPIO4]        = 7,
>> -    [IRQ_DM355_GPIO5]        = 7,
>> -    [IRQ_DM355_GPIO6]        = 7,
>> -    [IRQ_DM355_GPIO7]        = 7,
>> -    [IRQ_DM355_GPIO8]        = 7,
>> -    [IRQ_DM355_GPIO9]        = 7,
>> -    [IRQ_DM355_GPIOBNK0]        = 7,
>> -    [IRQ_DM355_GPIOBNK1]        = 7,
>> -    [IRQ_DM355_GPIOBNK2]        = 7,
>> -    [IRQ_DM355_GPIOBNK3]        = 7,
>> -    [IRQ_DM355_GPIOBNK4]        = 7,
>> -    [IRQ_DM355_GPIOBNK5]        = 7,
>> -    [IRQ_DM355_GPIOBNK6]        = 7,
>> -    [IRQ_COMMTX]            = 7,
>> -    [IRQ_COMMRX]            = 7,
>> -    [IRQ_EMUINT]            = 7,
>> +static u8 dm355_aintc_prios[] = {
>> +    2, 6, 6, 6, 6, 6, 6, 7,
>> +    6, 6, 6, 4, 4, 7, 7, 5,
>> +    5, 5, 5, 7, 4, 7, 7, 7,
>> +    7, 7, 7, 7, 7, 4, 2, 2,
>> +    7, 7, 7, 7, 7, 3, 3, 3,
>> +    3, 3, 3, 7, 4, 4, 7, 7,
>> +    7, 7, 7, 7, 7, 7, 7, 7,
>> +    7, 7, 7, 7, 7, 7, 0, 0,
>>   };
> 
> Hmm... this makes it harder to see what is going on here.
> You can no longer see which priority corresponds to which
> IRQ without consulting a manual.

I agree with David here. The interrupt numbers are dynamic, but the
interrupt number offset from hardware point-of-view is fixed. So can
these macros be re-purposed to represent the hardware offset (eventually
you would pass them to DAVINCI_INTC_IRQ())?

Thanks,
Sekhar