Re: [PATCH v2 0/5] ARM: dts: rcar-gen2: Convert to new CPG/MSSR bindings

On Fri, Aug 18, 2017 at 11:11:33AM +0200, Geert Uytterhoeven wrote:

	Hi Simon, Magnus,

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 converts the various R-Car Gen2 DTSes to migrate to the new
CPG/MSSR drivers that were added in v4.13-rc1.

Note that module reset descriptions will be added later.

Changes compared to v1:
  - Rebased.

Dependencies:
  - renesas-devel-20170818-v4.13-rc5.

Known issues:
  - The CPG/MSSR driver is initialized later than the old clk-rcar-gen2
    driver, causing changes of initialization order for other drivers.

    Currently the PHY subsystem does not support probe deferral

	+irq: no irq domain found for /interrupt-controller@e61c0000 !

	-Micrel KSZ8041RNLI ee700000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.ethernet-ffffffff:01, irq=182)
	+Micrel KSZ8041RNLI ee700000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.ethernet-ffffffff:01, irq=-1)

    leading to the Ethernet PHY falling back to polling instead of using an
    interrupt.  This can be remedied by "of_mdio: Fix broken PHY IRQ in
    case of probe deferral" (https://patchwork.kernel.org/patch/9734175/),
    which is still pending approval.

    Fortunately the impact of this is limited to a small delay in the
    detection of cable (un)plugging.
    Note that when using the PHY interrupt, cable unplugging is reported
    instantaneous, but plugging takes ca. 1.5-1.8 seconds.  Hence when
    using polling with the standard interval of 1 second, the link comes up
    in about the same time.

For your convenience, this series is also available in the
topic/rcar2-cpg-mssr-dt-v2 branch of my renesas-drivers git repository at
git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git.

This has been tested on r8a7790/lager, r8a7791/koelsch, r8a7792/blanche,
r8a7793/gose, and r8a7794/alt.  /sys/kernel/debug/clk/clk_summary has
been compared before and after the conversion.

Thanks for applying!

Thanks, applied for v4.15.