linux-kernel - Re: [PATCH v2 1/1] Input: atmel_mxt_ts - Get IRQ edge/level flags on DT booting

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Date:	Fri, 08 Aug 2014 15:07:33 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Stephen Warren <swarren@...dia.com>,
	Yufeng Shen <miletus@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] Input: atmel_mxt_ts - Get IRQ edge/level flags
 on DT booting

On 07/08/14 08:44, Javier Martinez Canillas wrote:
> The Atmel maXTouch driver assumed that the IRQ type flags will
> always be passed using platform data but this is not true when
> booting using Device Trees. In these setups the interrupt type
> was ignored by the driver when requesting an IRQ.
> 
> This means that it will fail if a machine specified other type
> than IRQ_TYPE_NONE. The right approach is to get the IRQ flags
> that was parsed by OF from the "interrupt" Device Tree propery.
> 
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

I'm happy for this to go in if Dmitry will accept it. It does seem to be a
quirk of some platforms that it is necessary, but it's only one line.

Thanks for spending so much time debugging this.

Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>

> ---
> 
> This patch was first sent as a part of a two part series along
> with [PATCH 2/2] Input: atmel_mxt_ts - Add keycodes array example.
> 
> But there are no dependencies between these two patches so there
> is no need to resend that one with no changes for v2.
> 
> Changes since v1:
>  - Assign flags to pdata->irqflags in mxt_parse_dt() instead of probe().
>    Suggested by Tomasz Figa.
> 
>  drivers/input/touchscreen/atmel_mxt_ts.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index 03b8571..5c8cbd3 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -22,6 +22,7 @@
>  #include <linux/i2c.h>
>  #include <linux/i2c/atmel_mxt_ts.h>
>  #include <linux/input/mt.h>
> +#include <linux/irq.h>
>  #include <linux/interrupt.h>
>  #include <linux/of.h>
>  #include <linux/slab.h>
> @@ -2093,6 +2094,8 @@ static struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
>  	if (!pdata)
>  		return ERR_PTR(-ENOMEM);
>  
> +	pdata->irqflags = irq_get_trigger_type(client->irq);
> +
>  	if (of_find_property(client->dev.of_node, "linux,gpio-keymap",
>  			     &proplen)) {
>  		pdata->t19_num_keys = proplen / sizeof(u32);
> 
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