On Thu, Jan 23, 2014 at 5:23 AM, Dinh Nguyen <dinh.linux@xxxxxxxxx> wrote:
> Hi Tien Hock,
>
> On 1/22/14 12:09 PM, Gerhard Sittig wrote:
>> On Wed, Jan 22, 2014 at 10:54 +0800, thloh@xxxxxxxxxx wrote:
>>> From: Tien Hock Loh <thloh@xxxxxxxxxx>
>>>
>>> Add driver support for Altera GPIO soft IP, including interrupts and I/O.
>>> Tested on Altera CV SoC board using dipsw and LED using LED framework.
>>>
>>> Signed-off-by: Tien Hock Loh <thloh@xxxxxxxxxx>
>>> ---
>>> .../devicetree/bindings/gpio/gpio-altera.txt | 42 +++
>>> drivers/gpio/Kconfig | 7 +
>>> drivers/gpio/Makefile | 1 +
>>> drivers/gpio/gpio-altera.c | 420 +++++++++++++++++++++
>>> 4 files changed, 470 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-altera.txt
>>> create mode 100644 drivers/gpio/gpio-altera.c
>> Since you not only introduce the driver, but do introduce the
>> binding as well, I'd suggest to reflect this in the commit
>> message. And put 'binding' into the subject line such that DT
>> people can be aware they should have a look.
>
> Yes, and you also do not have the correct DT email address too.
> Please look at the updated MAINTAINERS file for the correct DT
> BINDINGS address.
>
> Dinh
Yeah, it seems like Rob's email had changed since my last post.
However, he should be getting the email from
devicetree@xxxxxxxxxxxxxxx mailing list as well.
>>
>>
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/gpio/gpio-altera.txt
>>> @@ -0,0 +1,42 @@
>>> +Altera GPIO controller bindings
>>> +
>>> +Required properties:
>>> +- compatible:
>>> + - "altr,pio-1.0"
>>> +- reg: Physical base address and length of the controller's registers.
>>> +- #gpio-cells : Should be 1
>>> + - The first cell is the gpio offset number
>>> +- gpio-controller : Marks the device node as a GPIO controller.
>> Learning about required data types when reading the binding would
>> be nice. So that DTS authors can tell whether a property is
>> boolean, takes integers or strings, etc
>>
>>> +- #interrupt-cells : Should be 1.
>>> + - The first cell is the GPIO offset number within the GPIO controller.
>>> +- interrupts: Specify the interrupt.
>>> +- interrupt-controller: Mark the device node as an interrupt controller
>> Are these really 'required'? I'd expect those to be optional.
>>
>>> +
>>> +Altera GPIO specific properties:
>>> +- altr,gpio-bank-width: Width of the GPIO bank. This defines how many pins the
>>> + GPIO device has. Ranges between 1-32. Optional and defaults to 32 is not
>>> + specified.
>> In addition to being specific to the Altera GPIO implementation,
>> aren't these optional, too?
>>
>>> +- altr,interrupt_trigger: Specifies the interrupt trigger type the GPIO
>>> + hardware is synthesized. This field is required if the Altera GPIO controller
>>> + used has IRQ enabled as the interrupt type is not software controlled,
>>> + but hardware synthesized. Required if GPIO is used as an interrupt
>>> + controller. The value is defined in <dt-bindings/interrupt-controller/irq.h>
>>> + Only the following flags are supported:
>>> + IRQ_TYPE_EDGE_RISING
>>> + IRQ_TYPE_EDGE_FALLING
>>> + IRQ_TYPE_EDGE_BOTH
>>> + IRQ_TYPE_LEVEL_HIGH
>> This text suggests that using the GPIO bank as an interrupt
>> controller indeed is optional. As one would expect.
>>
>>> +
>>> +Example:
>>> +
>>> +gpio_altr: gpio_altr {
>> Should node names not be generic, i.e. "gpio"? While aliases do
>> have specific names since they identify a specific node, to later
>> reference it from other sites.
>>
>>> + compatible = "altr,pio-1.0";
>>> + reg = <0xff200000 0x10>;
>>> + interrupts = <0 45 4>;
>>> + altr,gpio-bank-width = <32>;
>>> + altr,interrupt_trigger = <IRQ_TYPE_EDGE_RISING>;
>>> + #gpio-cells = <1>;
>>> + gpio-controller;
>>> + #interrupt-cells = <1>;
>>> + interrupt-controller;
>>> +};
>>
>> virtually yours
>> Gerhard Sittig
>
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