linux-kernel - Re: [PATCH 5/9] mtd: rawnand: brcmnand: Allow working without interrupts

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Message-ID: <ee2d9730-6f7c-a210-8949-0eb2edd9b22e@gmail.com>
Date:   Mon, 27 Dec 2021 09:05:52 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Brian Norris <computersforpeace@...il.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Cai Huoqing <caihuoqing@...du.com>,
        Colin Ian King <colin.king@...el.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:BROADCOM SPECIFIC AMBA DRIVER (BCMA)" 
        <linux-wireless@...r.kernel.org>,
        "open list:BROADCOM STB NAND FLASH DRIVER" 
        <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH 5/9] mtd: rawnand: brcmnand: Allow working without
 interrupts



On 12/25/2021 9:45 AM, Andy Shevchenko wrote:
> On Sat, Dec 25, 2021 at 1:41 AM Florian Fainelli <f.fainelli@...il.com> wrote:
>>
>> The BCMA devices include the brcmnand controller but they do not wire up
>> any interrupt line, allow the main interrupt to be optional and update
>> the completion path to also check for the lack of an interrupt line.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> 
>> -       unsigned int            irq;
>> +       int                     irq;
> 
> instead.,,
> 
>> +       ctrl->irq = platform_get_irq_optional(pdev, 0);
>> +       if (ctrl->irq >= 0) {
> 
> ret = ...
> if (ret > 0) {
> 
> And drop 0 from the equation, OF never uses 0 as valid vIRQ.

OK but the point of this patch series is to allow the use of the 
brcmnand driver in a configuration without OF. I don't really see the 
point in continuing to use unsigned int instead of just letting 
request_irq() play through and tell us if the interrupt descriptor was 
valid later on.
-- 
Florian