linux-kernel - Re: [PATCH] mfd: stmpe: add OF support for irq-over-gpio

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Date:	Fri, 29 Aug 2014 12:20:27 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Sean Cross <xobs@...agi.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
	bunnie@...agi.com
Subject: Re: [PATCH] mfd: stmpe: add OF support for irq-over-gpio

On Tue, 19 Aug 2014, Sean Cross wrote:

> When using the STMPE610 or STMPE811 as a platform device, the platform data
> struct allows for irq_over_gpio to be set.  This patch allows for using a
> GPIO as an IRQ source when using device tree by specifying an irq-gpio
> property.
> 
> Signed-off-by: Sean Cross <xobs@...agi.com>
> ---
>  Documentation/devicetree/bindings/mfd/stmpe.txt | 1 +
>  drivers/mfd/stmpe.c                             | 7 ++++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)

See: Documentation/devicetree/bindings/submitting-patches.txt

- You need to break this up into two patches
- You need to CC the DT folks.

> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index 56edb55..3fb68bf 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -13,6 +13,7 @@ Optional properties:
>   - interrupt-parent             : Specifies which IRQ controller we're connected to
>   - wakeup-source                : Marks the input device as wakable
>   - st,autosleep-timeout         : Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
> + - irq-gpio                     : If present, which GPIO to use for event IRQ
>  
>  Example:
>  
> diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
> index 3b6bfa7..4c42b05 100644
> --- a/drivers/mfd/stmpe.c
> +++ b/drivers/mfd/stmpe.c
> @@ -1122,7 +1122,12 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
>  	if (pdata->id < 0)
>  		pdata->id = -1;
>  
> -	pdata->irq_trigger = IRQF_TRIGGER_NONE;
> +	pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
> +				&pdata->irq_trigger);
> +	if (gpio_is_valid(pdata->irq_gpio))
> +		pdata->irq_over_gpio = 1;
> +	else
> +		pdata->irq_trigger = IRQF_TRIGGER_NONE;
>  
>  	of_property_read_u32(np, "st,autosleep-timeout",
>  			&pdata->autosleep_timeout);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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