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    SubjectRe: [PATCH v4] ARC: clk: introduce HSDK pll driver
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    On 08/25/2017 10:39 AM, Eugeniy Paltsev wrote:
    > HSDK board manages its clocks using various PLLs. These PLL have same
    > dividers and corresponding control registers mapped to different addresses.
    > So we add one common driver for such PLLs.
    >
    > Each PLL on HSDK board consists of three dividers: IDIV, FBDIV and
    > ODIV. Output clock value is managed using these dividers.
    >
    > We add pre-defined tables with supported rate values and appropriate
    > configurations of IDIV, FBDIV and ODIV for each value.
    >
    > As of today we add support for PLLs that generate clock for the
    > HSDK arc cpus, system, ddr, AXI tunnel and hdmi.
    >
    > By this patch we add support for several plls (arc cpus pll and others),
    > so we had to use two different init types: CLK_OF_DECLARE for arc cpus pll
    > and regular probing for others plls.
    >
    > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
    > ---
    > Changes v3 -> v4:
    > * Rename HSDKv1 to HSDK
    >
    > Changes v2 -> v3:
    > * Add special management of arc core interface divider.
    >
    > Changes v1 -> v2:
    > * Remove all MODULE* defines as this driver can't be build as module.
    > * Simplified hsdk_pll_is_err and hsdk_pll_is_locked functions.
    > * Use unsigned long fo best_rate in hsdk_pll_round_rate.
    > * Use of_clk_get_parent_count to get num_parents.
    > * Other small changes.
    >
    > .../bindings/clock/snps,hsdk-pll-clock.txt | 28 ++
    > MAINTAINERS | 6 +
    > drivers/clk/Kconfig | 7 +
    > drivers/clk/Makefile | 1 +
    > drivers/clk/clk-hsdk-pll.c | 431 +++++++++++++++++++++
    > 5 files changed, 473 insertions(+)
    > create mode 100644 Documentation/devicetree/bindings/clock/snps,hsdk-pll-clock.txt
    > create mode 100644 drivers/clk/clk-hsdk-pll.c

    Reviewed-by: Vineet Gupta <vgupta@synopsys.com>

    P.S. Stephen I'd be nice if this can make it into 4.14 as we are slated to add the
    hasdk platform support in there.

    Thx,
    -Vineet

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