linux-kernel - Re: [PATCH 1/4] Documentation: dt: soc: move driver description to a separate document

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Date:	Tue, 13 Oct 2015 14:21:51 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Rob Herring <robh+dt@...nel.org>
CC:	Jonathan Corbet <corbet@....net>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/4] Documentation: dt: soc: move driver description to
 a separate document

On 10/13/2015 02:01 PM, Rob Herring wrote:
> On Tue, Oct 13, 2015 at 12:28 PM, Murali Karicheri <m-karicheri2@...com> wrote:
>> On 10/13/2015 10:42 AM, Rob Herring wrote:
>>>
>>> On Mon, Oct 12, 2015 at 2:46 PM, Murali Karicheri <m-karicheri2@...com>
>>> wrote:
>>>>
>>>> Currently the DT bindings have details about the driver as well. This
>>>> patch moves this to a separate document for knav qmss driver so that
>>>> driver detail update can be done as needed without polluting the DT
>>>> bindings description.
>>>>
>>>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>>>> ---
>>>>    Documentation/arm/keystone/knav-qmss.txt           | 24
>>>> ++++++++++++++++++++++
>>>>    .../bindings/soc/ti/keystone-navigator-qmss.txt    | 20
>>>> ++++--------------
>>>>    2 files changed, 28 insertions(+), 16 deletions(-)
>>>>    create mode 100644 Documentation/arm/keystone/knav-qmss.txt
>>>>
>>>> diff --git a/Documentation/arm/keystone/knav-qmss.txt
>>>> b/Documentation/arm/keystone/knav-qmss.txt
>>>> new file mode 100644
>>>> index 0000000..79946d1
>>>> --- /dev/null
>>>> +++ b/Documentation/arm/keystone/knav-qmss.txt
>>>> @@ -0,0 +1,24 @@
>>>> +* Texas Instruments Keystone Navigator Queue Management SubSystem driver
>>>> +
>>>> +Driver source code path
>>>> +  drivers/soc/ti/knav_qmss.c
>>>> +  drivers/soc/ti/knav_qmss_acc.c
>>>> +
>>>> +The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of
>>>> +the main hardware sub system which forms the backbone of the Keystone
>>>> +multi-core Navigator. QMSS consist of queue managers, packed-data
>>>> structure
>>>> +processors(PDSP), linking RAM, descriptor pools and infrastructure
>>>> +Packet DMA.
>>>> +The Queue Manager is a hardware module that is responsible for
>>>> accelerating
>>>> +management of the packet queues. Packets are queued/de-queued by writing
>>>> or
>>>> +reading descriptor address to a particular memory mapped location. The
>>>> PDSPs
>>>> +perform QMSS related functions like accumulation, QoS, or event
>>>> management.
>>>> +Linking RAM registers are used to link the descriptors which are stored
>>>> in
>>>> +descriptor RAM. Descriptor RAM is configurable as internal or external
>>>> memory.
>>>> +The QMSS driver manages the PDSP setups, linking RAM regions,
>>>> +queue pool management (allocation, push, pop and notify) and descriptor
>>>> +pool management.
>>>> +
>>>> +knav qmss driver provides a set of APIs to drivers to open/close qmss
>>>> queues,
>>>> +allocate descriptor pools, map the descriptors, push/pop to queues etc.
>>>> For
>>>> +details of the available APIs, please refers to
>>>> include/linux/soc/ti/knav_qmss.h
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/soc/ti/keystone-navigator-qmss.txt
>>>> b/Documentation/devicetree/bindings/soc/ti/keystone-navigator-qmss.txt
>>>> index d8e8cdb..2cecea1 100644
>>>> ---
>>>> a/Documentation/devicetree/bindings/soc/ti/keystone-navigator-qmss.txt
>>>> +++
>>>> b/Documentation/devicetree/bindings/soc/ti/keystone-navigator-qmss.txt
>>>> @@ -1,20 +1,8 @@
>>>> -* Texas Instruments Keystone Navigator Queue Management SubSystem driver
>>>> -
>>>> -The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of
>>>> -the main hardware sub system which forms the backbone of the Keystone
>>>> -multi-core Navigator. QMSS consist of queue managers, packed-data
>>>> structure
>>>> -processors(PDSP), linking RAM, descriptor pools and infrastructure
>>>> -Packet DMA.
>>>> -The Queue Manager is a hardware module that is responsible for
>>>> accelerating
>>>> -management of the packet queues. Packets are queued/de-queued by writing
>>>> or
>>>> -reading descriptor address to a particular memory mapped location. The
>>>> PDSPs
>>>> -perform QMSS related functions like accumulation, QoS, or event
>>>> management.
>>>> -Linking RAM registers are used to link the descriptors which are stored
>>>> in
>>>> -descriptor RAM. Descriptor RAM is configurable as internal or external
>>>> memory.
>>>> -The QMSS driver manages the PDSP setups, linking RAM regions,
>>>> -queue pool management (allocation, push, pop and notify) and descriptor
>>>> -pool management.
>>>
>>>
>>> Only the last sentence seems to be about the driver and is rather
>>> obvious (a driver manages the h/w). I would leave all this as-is
>>> currently.
>>>
>>> Rob
>>>
>> Rob,
>>
>> I am taking the liberty to add your Ack based on the above. I can remove it
>> if you disagree.
>
> No, I don't. I don't agree with moving this out of the binding. This
> mostly sounds like a description of the h/w to me, so I'd like to keep
> it. Most bindings are rather vague in this regard and I'd rather see
> more description than less.
>
Rob,

Sorry, I got you wrong. I will undo the DT documentation change and add 
the update for firmware to driver document.

> I also agree with Arnd's comment about not pointing to kernel docs.

Which comment are you talking about? I can't see his comment though 
against 1/4. I see he has acked 2/4. Can you clarify?

Do you have objections against the reference to driver documentation 
from DT Doc? Not sure why there should be any issue with the reference. 
But if you insists, I will remove below reference from the patch.

+For details of the driver, please refer to
+Documentation/arm/keystone/knav-qmss.txt

So here is the summary of what I will do.
1) Don't remove the driver description from DT document
2) remove the reference to driver document as per 1) this becomes redundant.
3) I will keep the driver description patch 2/4 to include the details 
about the driver only. No change to DT,

Hope this is what you would like me to do.

Thanks.

Murali
>
> Rob
>
>


-- 
Murali Karicheri
Linux Kernel, Keystone
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