Subject: [PATCH v3 1/2] can: m_can: add device tree binding documentation

From: [email-masked] (Varka Bhadram)
Date: Mon, 14 Jul 2014 10:48:23 +0530

On 07/14/2014 10:34 AM, Dong Aisheng wrote:
> On Mon, Jul 14, 2014 at 10:07:06AM +0530, Varka Bhadram wrote:
>> On 07/14/2014 08:54 AM, Dong Aisheng wrote:
>>> On Fri, Jul 11, 2014 at 04:11:03PM +0530, Varka Bhadram wrote:
>>>> On 07/11/2014 03:59 PM, Dong Aisheng wrote:
>>>>> add M_CAN device tree binding documentation
>>>>>
>>>>> Cc: Wolfgang Grandegger<[email-masked]>
>>>>> Cc: Marc Kleine-Budde<[email-masked]>
>>>>> Cc: Mark Rutland<[email-masked]>
>>>>> Cc: Oliver Hartkopp<[email-masked]>
>>>>> Cc: Varka Bhadram<[email-masked]>
>>>>> Signed-off-by: Dong Aisheng<[email-masked]>
>>>>> ---
>>>>>   .../devicetree/bindings/net/can/m_can.txt          |   65 ++++++++++++++++++++
>>>>>   1 files changed, 65 insertions(+), 0 deletions(-)
>>>>>   create mode 100644 Documentation/devicetree/bindings/net/can/m_can.txt
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/net/can/m_can.txt b/Documentation/devicetree/bindings/net/can/m_can.txt
>>>>> new file mode 100644
>>>>> index 0000000..c4cb263
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/net/can/m_can.txt
>>>>> @@ -0,0 +1,65 @@
>>>>> +Bosch MCAN controller Device Tree Bindings
>>>>> +-------------------------------------------------
>>>>> +
>>>>> +Required properties:
>>>>> +- compatible		: Should be "bosch,m_can" for M_CAN controllers
>>>>> +- reg			: physical base address and size of the M_CAN
>>>>> +			  registers map and Message RAM
>>>>> +- reg-names		: Should be "m_can" and "message_ram"
>>>>> +- interrupts		: Should be the interrupt number of M_CAN interrupt
>>>>> +			  line 0 and line 1, could be same if sharing
>>>>> +			  the same interrupt.
>>>>> +- interrupt-names	: Should contain "int0" and "int1"
>>>>> +- clocks		: Clocks used by controller, should be host clock
>>>>> +			  and CAN clock.
>>>>> +- clock-names		: Should contain "hclk" and "cclk"
>>>>> +- pinctrl-<n>		: Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
>>>> I think this should be pinctrl-0
>>>>
>>> First, this part is defined by pinctrl binding doc.
>>> Second i think it may be possible someone wants to add other pinctrl states
>>> when implement low power state in the future.
>>> So i just keep it as pinctrl-<n>.
>> Normally we will use pinctrl-0 for mentioning the pinctrl bindings.
>>
>> If somebody going to add something to the pinctrl bindings they will
>> add separately with pinctrl-1: bla bla bla...
>>
> Will it cause misleading that it only supports one state?
> And if we only define pinctrl-0 here, how do we describe pinctrl-names?
> It should be "default"? It looks not accurate enough to me.
>
> Per my understanding, I think it's better to leave it as standard
> pinctrl-binding doc states since anyhow people should read pinctrl-binding doc.
>
>>>>> +- pinctrl-names		: Names corresponding to the numbered pinctrl states
>>>> remove 1 tab space before :
>>>>
>>> It's a bit strange.
>>> Other line like pinctrl-<n> is also two tabs.
>>> And the code looks fine and already aligned.
>>> - pinctrl-<n>		: Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
>>> - pinctrl-names		: Names corresponding to the numbered pinctrl states
>>> Do you mean change line of pinctrl-names from two tabs to one space and a tab before :?
>>>
>> When i see in the patch the alignment is like this
>> pinctrl-<n>	:
>> pinctrl-name		:
>>
> Yes,in the original patch it's like:
> +- pinctrl-<n>          : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
> +- pinctrl-names                : Names corresponding to the numbered pinctrl states
>
> If remove one tab:
> +- pinctrl-<n>          : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
> +- pinctrl-names        : Names corresponding to the numbered pinctrl states
>
> But in vim reading the code, it's like:
> - pinctrl-<n>           : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
> - pinctrl-names : Names corresponding to the numbered pinctrl states
> I don't know why.
> What should we do about this case?

It seems to me that the style followed in bindings/pinctrl/pinctrl-bindings.txt
looks good to me.

pinctrl-<n>:		Pinctrl states as described in
			bindings/pinctrl/pinctrl-bindings.txt
pinctrl-names: 		Names corresponding to the
			numbered pinctrl states

>>>>> +- mram-cfg		: Message RAM configuration data.
>>>>> +  Multiple M_CAN instances can share the same Message RAM and each element(e.g
>>>>> +  Rx FIFO or Tx Buffer and etc) number in Message RAM is also configurable,
>>>>> +  so this property is telling driver how the shared or private Message RAM
>>>>> +  are used by this M_CAN controller.
>>>>> +
>>>> It may written like:
>>>> mram-cfg		: Message RAM configuration data
>>>> 			  Multiple M_CAN instances can share the same Message RAM and each element
>>>> 			  (e.g Rx FIFO or Tx Buffer and etc) number in Message RAM is also configurable,
>>>> 			  ...
>>>>
>>> I'm fine with that.
>>> The question is it's easy to over 80 columns if writing like that,
>>> is it ok?
>> When we follow the above format it would be more readable.
>>
> Okay.
>
>>> Regards
>>> Dong Aisheng
>> -- 
>> Regards,
>> Varka Bhadram.
>>
> Regards
> Dong Aisheng
>
>   

-- 
Regards,
Varka Bhadram.