linux-kernel - Re: [PATCH v2 1/7] mfd: add atmel-hlcdc driver

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Message-ID: <20140616170301.GC14323@lee--X1>
Date:	Mon, 16 Jun 2014 18:03:01 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	David Airlie <airlied@...ux.ie>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 1/7] mfd: add atmel-hlcdc driver

On Mon, 16 Jun 2014, Boris BREZILLON wrote:
> On 16/06/2014 14:50, Lee Jones wrote:
> >> The HLCDC IP available on some Atmel SoCs (i.e. at91sam9n12, at91sam9x5
> >> family or sama5d3 family) exposes 2 subdevices:
> >> - a display controller (controlled by a DRM driver)
> >> - a PWM chip
> >>
> >> Add support for the MFD device which will just retrieve HLCDC clocks and
> >> create a regmap so that subdevices can access the HLCDC register range
> >> concurrently.
> >>
> >> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> >> ---
> >>  .../devicetree/bindings/mfd/atmel-hlcdc.txt        |  41 ++++++++
> >>  drivers/mfd/Kconfig                                |  11 ++
> >>  drivers/mfd/Makefile                               |   1 +
> >>  drivers/mfd/atmel-hlcdc.c                          | 116 +++++++++++++++++++++
> >>  include/linux/mfd/atmel-hlcdc.h                    |  78 ++++++++++++++
> >>  5 files changed, 247 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> >>  create mode 100644 drivers/mfd/atmel-hlcdc.c
> >>  create mode 100644 include/linux/mfd/atmel-hlcdc.h
> >> diff --git a/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt b/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> >> new file mode 100644
> >> index 0000000..f5b69cb
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt

[...]

> >> +		hlcdc-display-controller {
> >> +			compatible = "atmel,hlcdc-dc";
> >> +			interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
> > I assume you're using the 3rd parameter for flags.  If so, please use
> > the defines.
> 
> No, the third parameter encodes the irq priority (from 0 to 7 IIRC).

Ah okay.  Can you point me to the documentation for this IRQ
controller please?  I'd like to have a quick peek.  It might be worth
defining the priority to prevent confusion, also you definitely should
document it in your binding.

[...]

> >> +static struct platform_driver atmel_hlcdc_driver = {
> >> +	.probe = atmel_hlcdc_probe,
> >> +	.remove = atmel_hlcdc_remove,
> >> +	.driver = {
> >> +		.name = "atmel-hlcdc",
> >> +		.owner = THIS_MODULE,
> >> +		.of_match_table = atmel_hlcdc_match,
> > Is this driver DT only?
> 
> Yes it is.

So it should depend on OF in the Kconfig entry.

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