Message-ID: <CAL_JsqKSb8V0oMg_v=48T8Cg138UtfGgVt5bBOwxvNtDVeEcZA@mail.gmail.com>
Date:	Tue, 13 Oct 2015 13:01:29 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Murali Karicheri <m-karicheri2@...com>
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 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.

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

Rob
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