linux-kernel - Re: [PATCH v3 08/10] clk: sunxi-ng: support R40 SoC

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Date:   Sat, 12 Aug 2017 12:05:38 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v3 08/10] clk: sunxi-ng: support R40 SoC

On Sat, Aug 12, 2017 at 12:04 PM,  <icenowy@...c.io> wrote:
> 在 2017-05-29 15:34，Chen-Yu Tsai 写道：
>>
>> Hi,
>>
>> On Sat, May 27, 2017 at 06:23:06PM +0800, Icenowy Zheng wrote:
>>>
>>> Allwinner R40 SoC have a clock controller module in the style of the
>>> SoCs beyond sun6i, however, it's more rich and complex.
>>>
>>> Add support for it.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>>> ---
>>> Changes in v3:
>>> - Rebased on current linux-next.
>>> Changes in v2:
>>> - Fixes according to the SoC's user manual.
>>>
>>>  drivers/clk/sunxi-ng/Kconfig              |   10 +
>>>  drivers/clk/sunxi-ng/Makefile             |    1 +
>>>  drivers/clk/sunxi-ng/ccu-sun8i-r40.c      | 1153
>>> +++++++++++++++++++++++++++++
>>>  drivers/clk/sunxi-ng/ccu-sun8i-r40.h      |   68 ++
>>>  include/dt-bindings/clock/sun8i-r40-ccu.h |  191 +++++
>>>  include/dt-bindings/reset/sun8i-r40-ccu.h |  129 ++++
>>>  6 files changed, 1552 insertions(+)
>>>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-r40.c
>>>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-r40.h
>>>  create mode 100644 include/dt-bindings/clock/sun8i-r40-ccu.h
>>>  create mode 100644 include/dt-bindings/reset/sun8i-r40-ccu.h
>>>
>> ...
>>>
>>> +static SUNXI_CCU_NM_WITH_GATE_LOCK(pll_ddr1_clk, "pll-ddr1",
>>> +                                  "osc24M", 0x04c,
>>> +                                  8, 7,        /* N */
>>
>>
>> N has minimum and maximum limits.
>
>
> These constraints are never implemented in old SoCs.

Then we should implement them if we find that they are
missing.

ChenYu