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

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Message-ID: <CAL_Jsq+GZn0X-sxQ=oqRP7fR3bCPk5PN5CjgXzjnOxas_renzw@mail.gmail.com>
Date:	Tue, 13 Oct 2015 09:42:12 -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 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

> +* Texas Instruments Keystone Navigator (knav) Queue Management SubSystem driver
> +  DT bindings
>
> +For details of the driver, please refer to
> +Documentation/arm/keystone/knav-qmss.txt
>
>  Required properties:
>  - compatible   : Must be "ti,keystone-navigator-qmss";
> --
> 1.9.1
>
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