linux-kernel - Re: [PATCH V3 3/3] mfd: stmpe: Update DT support in stmpe driver

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Message-Id: <20121123094132.EFCB73E07BE@localhost>
Date:	Fri, 23 Nov 2012 09:41:32 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Viresh Kumar <viresh.kumar@...aro.org>, sameo@...ux.intel.com
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, lee.jones@...aro.org
Subject: Re: [PATCH V3 3/3] mfd: stmpe: Update DT support in stmpe driver

On Fri, 23 Nov 2012 00:26:20 +0530, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> From: Vipul Kumar Samar <vipulkumar.samar@...com>
> 
> This patch extends existing DT support for stmpe devices. This updates:
> - DT support from stmpe SPI and I2C drivers
> - missing header files in stmpe.c
> - stmpe_of_probe() with pwm, rotator and new bindings.
> - Bindings are updated in binding document.
> 
> Signed-off-by: Vipul Kumar Samar <vipulkumar.samar@...com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> V2->V3:
> ------
> - Removed sub-modules DT bindings from this patch
> - Retain original work done by Lee Jones
> 
>  Documentation/devicetree/bindings/mfd/stmpe.txt | 12 ++++++++----
>  drivers/mfd/stmpe-i2c.c                         | 15 +++++++++++++++
>  drivers/mfd/stmpe-spi.c                         | 15 +++++++++++++++
>  drivers/mfd/stmpe.c                             | 21 +++++++++++++++------
>  4 files changed, 53 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index 8f0aeda..8f65c8d 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -1,13 +1,17 @@
> -* STMPE Multi-Functional Device
> +* ST Microelectronics STMPE Multi-Functional Device
> +
> +STMPE is an MFD device which may expose following inbuilt devices: gpio, keypad,
> +touchscreen, adc, pwm, rotator.
>  
>  Required properties:
> - - compatible                   : "st,stmpe[811|1601|2401|2403]"
> - - reg                          : I2C address of the device
> + - compatible                   : "st,stmpe[610|801|811|1601|2401|2403]"
> + - reg                          : I2C/SPI address of the device
>  
>  Optional properties:
>   - interrupts                   : The interrupt outputs from the controller
> - - interrupt-controller         : Marks the device node as an interrupt controller
>   - interrupt-parent             : Specifies which IRQ controller we're connected to
> + - irq-trigger			: IRQ trigger to use for the interrupt to the host
> + - irq-invert-polarity		: bool, IRQ line is connected with reversed polarity

This looks odd. Normally the interrupt polarity should be encoded in the irq
specifier flags field.

g.

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