Message-ID: <54AFEF73.60508@imgtec.com>
Date:	Fri, 9 Jan 2015 15:10:43 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Mike Turquette <mturquette@...aro.org>,
	<linux-metag@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>
CC:	Heiko Stuebner <heiko@...ech.de>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Mark Rutland" <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2 00/16] tz1090: add clock components

Hi,

On 01/12/14 23:19, James Hogan wrote:
> This patchset adds common clock framework support for the TZ1090 SoC.

Any further comments on these patches? It'd be nice to be able to get
them into v3.20 if possible.

Cheers
James

> 
> Patch 1 adds common code to simplify TZ1090 clock providers.
> 
> Patches 2 to 6 add TZ1090 clock types, specifically:
> * Gate banks (a register containing clock gate bits)
> * Mux banks (a register containing clock mux bits)
> * Clock deleters (delete up to 1023 out of every 1024 clocks)
> * PLLs (True Circuits, but TZ1090 specific register interface)
> * Divider clock (pretty basic divider, but specific to TZ1090)
> 
> Patches 7 to 14 add clock providers and DT bindings:
> * Top level register  (TOP) clocks
> * High end peripheral (HEP) clocks
> * Peripheral (PERIP) clocks
> * PowerDown Controller (PDC) clocks
> 
> Finally patch 15 defines most of the TZ1090 clocks in DT using these
> clock providers, with a few placeholders for less interesting clocks
> from more complex components, and patch 16 hooks up the Meta core clock
> so that the precise frequency of the Meta clock source can be
> determined. These are mostly for reference to give an idea how the clock
> components are intended to be used, and I'll take this one through the
> metag tree when the drivers/clk/ stuff is accepted.
> 
> Changes since v1:
> 
> Rework (the main change):
> - Convert explicit DT representation of clock infrastructure using
>   generic bindings for individual components to several TZ1090 specific
>   bindings representing groups of TZ1090 clocks (thanks Heiko). This
>   results in more lines of code overall, but it is nicer and more
>   maintainable.
> - Add common code for allocating and registering TZ1090 specific clock
>   providers. Various tz1090_clk_register_*() helper functions are
>   provided to conveniently register various low level TZ1090 clocks in a
>   clock provider from static initialisation data, which can be
>   initialised statically using provided macros.
> - Drop DT bindings for TZ1090 gate banks, mux banks, deleters, dividers
>   and PLLs as they will be instantiated directly from a larger clock
>   provider rather than individually from DT.
> - Switch back to using clk_divider::width rather than clk_divider::mask.
>   Mask was only added to make it easier to be exposed in a DT binding,
>   which is no longer required.
> - Add DT bindings and clock providers for TZ1090 top level register
>   clocks (TOP), high end peripheral clocks (HEP), peripheral (PERIP)
>   clocks, and powerdown controller clocks (PDC).
> - Add headers in <dt-bindings/clock/> to enumerate provided clocks.
> - Move divider specific flags (policy) to clock providers as dividers
>   will be instantiated by a provider rather than directly from DT.
> 
> Functional changes and corrections:
> - Tweak various clock names. A couple were wrong, some had the slightly
>   redundant text "clk" in them, and others were output clocks so were
>   better named without the "_en" which the output of clock gates tend to
>   be called.
> - Add TOP_CLKEN register to top clocks, which gates system clock to PDC.
> - Combine unrepresented AFE block clocks into single fixed-clock
>   placeholder.
> 
> Other cleanups and refactorings:
> - Split out wrapped (meta exclusive locked) divider driver from PDC
>   clock driver to clk-tz1090-divider.c.
> - Change the PDC clocks DT bindings and driver to conceptually represent
>   all clocks provided by the PDC in TZ1090 rather than the same generic
>   arrangement of clocks as the PDC in TZ1090, since the driver will use
>   the common TZ1090 specific clock provider helpers to provide specific
>   clocks.
> - Change PDC clocks compatible string from "img,tz1090-pdc-clock" to
>   "img,tz1090-pdc-clocks" to match the intended purpose.
> - Add clock-names as required property to PDC clocks DT binding as used
>   by common TZ1090 clock provider code.
> - Mention standard clock-indices and clock-output-names in PDC clocks DT
>   binding as optional properties for when the clocks may be used by
>   other clock providers and should match the names used in the driver.
> - Split out use of Meta core clock into separate patch 16.
> - Renamed function prefixes from clk_tz1090_ to tz1090_clk_ for
>   consistency with the rest.
> - Tweak ascii art clock diagrams a little.
> 
> Cc: Mike Turquette <mturquette@...aro.org>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Heiko Stuebner <heiko@...ech.de>
> Cc: linux-metag@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> 
> James Hogan (16):
>   clk: tz1090: add clock provider common code
>   clk: tz1090: add gate bank clock driver
>   clk: tz1090: add mux bank clock driver
>   clk: tz1090: add deleter clock driver
>   clk: tz1090: add divider clock driver
>   clk: tz1090: add PLL clock driver
>   dt: binding: add binding for TZ1090 PDC clocks
>   clk: tz1090: add PDC clock provider driver
>   dt: binding: add binding for TZ1090 TOP clocks
>   clk: tz1090: add TOP clock provider driver
>   dt: binding: add binding for TZ1090 HEP clocks
>   clk: tz1090: add HEP clock provider driver
>   dt: binding: add binding for TZ1090 PERIP clocks
>   clk: tz1090: add PERIP clock provider driver
>   metag: tz1090: add TZ1090 clocks to device tree
>   metag: tz1090: connect Meta core clock
> 
>  .../bindings/clock/img,tz1090-hep-cru.txt          |  53 +++
>  .../bindings/clock/img,tz1090-pdc-clocks.txt       |  59 ++++
>  .../bindings/clock/img,tz1090-perip-cru.txt        |  49 +++
>  .../bindings/clock/img,tz1090-top-clocks.txt       |  68 ++++
>  arch/metag/Kconfig.soc                             |   1 +
>  arch/metag/boot/dts/tz1090.dtsi                    |   4 +
>  arch/metag/boot/dts/tz1090_clk.dtsi                | 143 ++++++++
>  drivers/clk/Makefile                               |   1 +
>  drivers/clk/tz1090/Makefile                        |  13 +
>  drivers/clk/tz1090/clk-tz1090-deleter.c            | 132 ++++++++
>  drivers/clk/tz1090/clk-tz1090-divider.c            | 151 +++++++++
>  drivers/clk/tz1090/clk-tz1090-gate-bank.c          | 149 +++++++++
>  drivers/clk/tz1090/clk-tz1090-hep.c                |  46 +++
>  drivers/clk/tz1090/clk-tz1090-mux-bank.c           | 139 ++++++++
>  drivers/clk/tz1090/clk-tz1090-pdc.c                |  52 +++
>  drivers/clk/tz1090/clk-tz1090-perip.c              |  57 ++++
>  drivers/clk/tz1090/clk-tz1090-pll.c                | 276 ++++++++++++++++
>  drivers/clk/tz1090/clk-tz1090-top.c                | 364 +++++++++++++++++++++
>  drivers/clk/tz1090/clk.c                           |  89 +++++
>  drivers/clk/tz1090/clk.h                           | 254 ++++++++++++++
>  include/dt-bindings/clock/tz1090-hep.h             |  19 ++
>  include/dt-bindings/clock/tz1090-pdc.h             |  18 +
>  include/dt-bindings/clock/tz1090-perip.h           |  30 ++
>  include/dt-bindings/clock/tz1090-top.h             | 118 +++++++
>  24 files changed, 2285 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-hep-cru.txt
>  create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-pdc-clocks.txt
>  create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-perip-cru.txt
>  create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-top-clocks.txt
>  create mode 100644 arch/metag/boot/dts/tz1090_clk.dtsi
>  create mode 100644 drivers/clk/tz1090/Makefile
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-deleter.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-divider.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-gate-bank.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-hep.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-mux-bank.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-pdc.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-perip.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-pll.c
>  create mode 100644 drivers/clk/tz1090/clk-tz1090-top.c
>  create mode 100644 drivers/clk/tz1090/clk.c
>  create mode 100644 drivers/clk/tz1090/clk.h
>  create mode 100644 include/dt-bindings/clock/tz1090-hep.h
>  create mode 100644 include/dt-bindings/clock/tz1090-pdc.h
>  create mode 100644 include/dt-bindings/clock/tz1090-perip.h
>  create mode 100644 include/dt-bindings/clock/tz1090-top.h
> 


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