linux-kernel - Re: [PATCH v4] ARC: clk: introduce HSDK pll driver

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Date:   Fri, 25 Aug 2017 11:16:35 -0700
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v4] ARC: clk: introduce HSDK pll driver

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@...opsys.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@...opsys.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