linux-kernel - Re: [PATCH] gpio-dwapb: reset mask register on probe

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Date:	Thu, 26 Mar 2015 10:29:34 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Vineet.Gupta1@...opsys.com" <Vineet.Gupta1@...opsys.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"gnurou@...il.com" <gnurou@...il.com>
Subject: Re: [PATCH] gpio-dwapb: reset mask register on probe

On Thu, Mar 19, 2015 at 9:44 AM, Alexey Brodkin
<Alexey.Brodkin@...opsys.com> wrote:

> So IMHO we need to update "gpio-dwapb" driver in the following manner:
>
>  [1] In dwapb_configure_irqs() in accordance to "snps,nr-gpios" in the
> first bank set a value in GPIO_INTEN. This way we turn N pins in that
> port/bank in "interrupt" mode from their default gpio mode.
>
>  [2] Don't expose dwapb_irq_enable()/dwapb_irq_disable() through
> ct->chip.irq_enable/ct->chip.irq_disable. Because we don't want to
> toggle modes of pins, right?
>
>  [3] Use ct->chip.irq_mask/ct->chip.irq_unmask for purpose of real
> enabling/disabling interrupts.
>
> If I'm not missing something that would be implementation that matches
> real device specification.
>
> If we do these changes then indeed we'll want to make sure GPIO_INTMASK
> is initialized with all interrupts masked out:
> --->8---
> dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
> --->8---
>
> Let me know if my proposal makes sense and then I'll send patch that
> implements it.

Sure as long as you can test it and it works, I'm fine with this.

I might be looking at migrating this quite popular driver to
GPIOLIB_IRQCHIP so would be happy if you can help out
testing it if I do this later.

Yours,
Linus Walleij
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