linux-kernel - Re: [PATCH] MIPS: Remove most of the custom gpio.h

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Message-ID: <CACRpkdZon9XHSMyieGDU8F037+4TxyCq=6z5vJwQ3k6QJm6MTg@mail.gmail.com>
Date:	Mon, 27 Jul 2015 15:20:08 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Alban Bedel <albeu@...e.fr>,
	Linux MIPS <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Rafał Miłecki <zajec5@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Tejun Heo <tj@...nel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Florian Fainelli <florian@...nwrt.org>,
	Joe Perches <joe@...ches.com>,
	Daniel Walter <dwalter@...gle.com>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	Huacai Chen <chenhc@...ote.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	James Hartley <james.hartley@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Waldemar Brodkorb <wbx@...nadk.org>,
	James Hogan <james.hogan@...tec.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Levente Kurusa <levex@...ux.com>,
	abdoulaye berthe <berthe.ab@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Input <linux-input@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] MIPS: Remove most of the custom gpio.h

On Thu, Jul 23, 2015 at 8:25 PM, Lars-Peter Clausen <lars@...afoo.de> wrote:
> On 07/22/2015 07:33 PM, Alban Bedel wrote:
>>
>> diff --git a/arch/mips/jz4740/gpio.c b/arch/mips/jz4740/gpio.c
>> index 54c80d4..3dc500c 100644
>> --- a/arch/mips/jz4740/gpio.c
>> +++ b/arch/mips/jz4740/gpio.c
>> @@ -262,18 +262,6 @@ uint32_t jz_gpio_port_get_value(int port, uint32_t
>> mask)
>>   }
>>   EXPORT_SYMBOL(jz_gpio_port_get_value);
>>
>> -int gpio_to_irq(unsigned gpio)
>> -{
>> -       return JZ4740_IRQ_GPIO(0) + gpio;
>> -}
>> -EXPORT_SYMBOL_GPL(gpio_to_irq);
>
>
> This need to be hooked up the gpio_to_irq() callback of the gpio_chip struct
> of this driver rather than completely removing it. Otherwise this
> functionality will be broken.
>
> Similar for other platforms which implement the function.

Even better is to see if we can convert the driver to
GPIOLIB_IRQCHIP which moves the handling of IRQ mapping
to the gpiolib core. This works for all simple cascading GPIO-with-IRQ
controllers with a local mask register. (Not when the system intcon
and GPIO is mashed up though.)

But no hurry with that.

Yours,
Linus Walleij
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