linux-kernel - Re: Armadaxp GPIO interrupts

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Message-ID: <CAG1O52XO+5F11ELZ+7txWXTYPwmhQP5sVvcjdCiM_T1+ptfp=w@mail.gmail.com>
Date:	Thu, 6 Aug 2015 23:48:24 +0530
From:	raghu MG <raghumag@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: Armadaxp GPIO interrupts

Ok...
my bad never realised DT entries are necessary.
will try this & post the results.

Regards
Raghu

On Thu, Aug 6, 2015 at 10:43 PM, Andrew Lunn <andrew@...n.ch> wrote:
> On Thu, Aug 06, 2015 at 10:28:12PM +0530, raghu MG wrote:
>> Ok,I think I need to understand more about this gpio driver.
>>
>> As you said its registering chained handler,but why are they(IRQs) not
>> visible in cat /proc/interrupts.
>
> chained interrupts are never visible there. All you see are leaf
> interrupts, i.e. the device interrupts. Here is my Armada XP based
> WRT1900AC:
>
> $ cat /proc/interrupts
>             CPU0       CPU1
>  16:    8959833   12783597  armada_370_xp_irq   5 Level     armada_370_xp_per_cpu_tick
>  19:          0          0  armada_370_xp_irq  31 Level     mv64xxx_i2c
>  20:       1453          0  armada_370_xp_irq  41 Level     serial
>  26:          0          0  armada_370_xp_irq  45 Level     ehci_hcd:usb3
>  27:       9682          0  armada_370_xp_irq   8 Level     mvneta
>  28:          4          0  armada_370_xp_irq  10 Level     mvneta
>  29:      35078          0  armada_370_xp_irq  55 Level     f10a0000.sata
>  30:       3839          0  armada_370_xp_irq 113 Level     f10d0000.nand
>  70:          0          0  f1018140.gpio   0 Edge      WPS
>  71:         20          0  f1018140.gpio   1 Edge      Factory Reset Button
>  90:          2          0  armada_370_xp_irq  51 Level     f1060900.xor
>  91:          2          0  armada_370_xp_irq  52 Level     f1060900.xor
>  92:          2          0  armada_370_xp_irq  94 Level     f10f0900.xor
>  93:          2          0  armada_370_xp_irq  95 Level     f10f0900.xor
>  94:          0          0  armada_370_xp_msi_irq   0 Edge      xhci_hcd
>
> Notice the two f1018140.gpio, which are the buttons.
>
>> Do I need to further initialize marvell GPIO registers to trigger
>> these events.
>
> Nope, just the normal gpio API and all will work, as demonstrated by
> the two buttons on my board.
>
>> Do I need to change the polarity in polarity register to suit the
>> board requirements in probe function.
>
> Nope, you put that in the DT file:
>
>         gpio_keys {
>                 compatible = "gpio-keys";
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>                 pinctrl-0 = <&keys_pin>;
>                 pinctrl-names = "default";
>
>                 button@1 {
>                         label = "WPS";
>                         linux,code = <KEY_WPS_BUTTON>;
>                         gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
>                 };
>
>                 button@2 {
>                         label = "Factory Reset Button";
>                         linux,code = <KEY_RESTART>;
>                         gpios = <&gpio1 1 GPIO_ACTIVE_HIGH>;
>                 };
>         };
>
> You can change GPIO_ACTIVE_HIGH to GPIO_ACTIVE_LOW if that is what you
> need.
>
>         Andrew
>
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