linux-kernel - Re: [RESEND/PATCHv3] arm: dts: omap5-evm: Add keypad support

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Date:	Tue, 30 Oct 2012 15:06:34 +0530
From:	Sourav <sourav.poddar@...com>
To:	"Cousson, Benoit" <b-cousson@...com>
CC:	<linux-omap@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, Felipe Balbi <balbi@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>
Subject: Re: [RESEND/PATCHv3] arm: dts: omap5-evm: Add keypad support

Hi Benoit,
On Tuesday 30 October 2012 02:43 PM, Cousson, Benoit wrote:
> Hi Sourav,
>
> On 10/30/2012 6:26 AM, Sourav wrote:
>> Hi Benoit,
>> On Monday 29 October 2012 10:14 PM, Benoit Cousson wrote:
>>> Hi Sourav,
>>>
>>> On 10/29/2012 11:40 AM, Sourav Poddar wrote:
>>>> Add keypad data node in omap5-evm.
>>>>
>>>> Based on I2C support patch for omap5, which has been
>>>> already posted as a different series.
>>>>
>>>> Tested on omap5430 evm with 3.7-rc1 kernel.
>>>>
>>>> Cc: Felipe Balbi <balbi@...com>
>>>> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
>>>>
>>>> Tested on omap5430 sdp with 3.7-rc1 kernel.
>>>>
>>>> Signed-off-by: Sourav Poddar <sourav.poddar@...com>
>>>> ---
>>>>   arch/arm/boot/dts/omap5-evm.dts |   95
>>>> +++++++++++++++++++++++++++++++++++++++
>>>>   1 files changed, 95 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/omap5-evm.dts
>>>> b/arch/arm/boot/dts/omap5-evm.dts
>>>> index c663eba..b812d6d 100644
>>>> --- a/arch/arm/boot/dts/omap5-evm.dts
>>>> +++ b/arch/arm/boot/dts/omap5-evm.dts
>>>> @@ -140,3 +140,98 @@
>>>>   &mcbsp3 {
>>>>       status = "disabled";
>>>>   };
>>>> +
>>>> +&i2c5 {
>>>> +    clock-frequency = <400000>;
>>>> +
>>>> +    smsc@38 {
>>>> +        compatible = "smscece1099";
>>>> +        reg = <0x38>;
>>>> +        clock = <0x13>;
>>> What does that "clock" mean?
>> This chip supports a clock control register which is used to enable the
>> interface used by the chip to communicate. Here, the interface which you
>> can are
>> SMBUS interface or BC-LINK interface.
>
> OK, so you should use a less generic name than "clock" and potentially 
> prefix it with "smsc," since it is not a generic attribute at all.
>
Sure, will think of less generic name. May be "smsc, ctrl-reg" will do.
> BTW, cannot we use the CCF in order to control that clock?
I don't have much idea about the CCF, so cant really comment on this.
> I guess it is just a clock mux?
Yes.
> Well, anyway we need CCF for OMAP to be merged first :-)
>
> But it might worth highlighting this is a temporary solution.
>
>>> I cannot find that in the binding documentation. BTW, did you add that
>>> documentation in the driver patch?
>> Nope, I missed out on the dt binding documentation for the driver. :(
>>
>> Will send a seperate patch for the bindings.
>
> Thanks,
> Benoit
>

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