linux-kernel - Re: [PATCH v2 00/10] clk: renesas: rcar-gen2: Add new CPG/MSSR drivers

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Date:   Fri, 19 May 2017 11:00:41 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 00/10] clk: renesas: rcar-gen2: Add new CPG/MSSR drivers

On Fri, May 19, 2017 at 10:45 AM, Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
> Currently Renesas R-Car Gen2 SoCs use the common clk-rcar-gen2,
> clk-mstp, and clk-div6 drivers, which depend on most clocks being
> described in DT.  Especially the module (MSTP) clocks are cumbersome and
> error prone, due to 3 arrays (clocks, clock-indices, and
> clock-output-names) to be kept in sync. In addition, the clk-mstp driver
> cannot be extended easily to also support module resets, which are
> provided by the same hardware module.
>
> Hence when developing support for R-Car Gen3 SoCs, another approach was
> chosen, which led to the CPG/MSSR driver core, and SoC-specific
> subdrivers (initially for R-Car Gen3, but later also for RZ/G1).
>
> This series introduces new clock drivers for all supported R-Car Gen2
> SoCs, using the CPG/MSSR driver core, and the support for RZ/G1.  They
> provide all clocks supported by the old driver, plus a few more.
> The old driver can still be used through a Kconfig option, to preserve
> backward compatibility with old DTBs.
>
> This series does not include the corresponding DTS updates.  These will
> be posted as a separate series later.

>  .../devicetree/bindings/clock/renesas,cpg-mssr.txt |  10 +-
>  drivers/clk/renesas/Kconfig                        |  22 +-
>  drivers/clk/renesas/Makefile                       |   4 +
>  drivers/clk/renesas/r8a7790-cpg-mssr.c             | 278 ++++++++++++++++++++
>  drivers/clk/renesas/r8a7791-cpg-mssr.c             | 286 +++++++++++++++++++++
>  drivers/clk/renesas/r8a7792-cpg-mssr.c             | 221 ++++++++++++++++
>  drivers/clk/renesas/r8a7794-cpg-mssr.c             | 255 ++++++++++++++++++
>  drivers/clk/renesas/renesas-cpg-mssr.c             |  29 +++
>  drivers/clk/renesas/renesas-cpg-mssr.h             |   4 +
>  include/dt-bindings/clock/r8a7790-cpg-mssr.h       |  52 ++++
>  include/dt-bindings/clock/r8a7791-cpg-mssr.h       |  48 ++++
>  include/dt-bindings/clock/r8a7792-cpg-mssr.h       |  43 ++++
>  include/dt-bindings/clock/r8a7793-cpg-mssr.h       |  48 ++++
>  include/dt-bindings/clock/r8a7794-cpg-mssr.h       |  47 ++++
>  14 files changed, 1341 insertions(+), 6 deletions(-)

BTW, the above diffstat should be combined with the diffstat for the DTS
conversion:

 arch/arm/boot/dts/r8a7790-lager.dts   |   7 +-
 arch/arm/boot/dts/r8a7790.dtsi        | 557 ++++++----------------------------
 arch/arm/boot/dts/r8a7791-koelsch.dts |   4 +-
 arch/arm/boot/dts/r8a7791-porter.dts  |   4 +-
 arch/arm/boot/dts/r8a7791.dtsi        | 557 +++++++---------------------------
 arch/arm/boot/dts/r8a7792-blanche.dts |   3 +-
 arch/arm/boot/dts/r8a7792-wheat.dts   |   3 +-
 arch/arm/boot/dts/r8a7792.dtsi        | 333 ++++----------------
 arch/arm/boot/dts/r8a7793-gose.dts    |   4 +-
 arch/arm/boot/dts/r8a7793.dtsi        | 459 +++++-----------------------
 arch/arm/boot/dts/r8a7794-alt.dts     |   3 +-
 arch/arm/boot/dts/r8a7794-silk.dts    |   3 +-
 arch/arm/boot/dts/r8a7794.dtsi        | 528 +++++---------------------------
 13 files changed, 430 insertions(+), 2035 deletions(-)

Giving a net removal of 270 lines.
That is, before removal of the backward compatibility of the drivers with
old DTBs, which would remove ca. 500 more lines.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds