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

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Date:   Sat, 12 Aug 2017 12:04:17 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        devicetree <devicetree@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 08/10] clk: sunxi-ng: support R40 SoC

On Sat, Jul 22, 2017 at 11:00 AM,  <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:

[...]

>>> +
>>> +/*
>>> + * For the special bit in gate part, please see the BSP source code at
>>> + *
>>> https://github.com/BPI-SINOVOIP/BPI-M2U-bsp/blob/master/linux-sunxi/drivers/clk/sunxi/clk-sun8iw11.c#L665
>>> + */
>>> +static SUNXI_CCU_NKM_WITH_GATE_LOCK(pll_sata_clk, "pll-sata",
>>> +                                   "osc24M", 0x034,
>>> +                                   8, 5,       /* N */
>>> +                                   4, 2,       /* K */
>>> +                                   0, 2,       /* M */
>>> +                                   BIT(31) | BIT(14),  /* gate */
>>> +                                   BIT(28),    /* lock */
>>> +                                   0);
>>
>>
>> I think this is a somewhat simplified approach. From what I understand
>> of the user manual, the SATA clock path look like:
>>
>>
>> [ PLL-PERIPH0-SATA ] -\
>>                       mux @ 0x34 bit 30 --- gate @ 0x34 bit 14 --- ...
>> [ PLL-SATA ] ---------/
>>
>> ... from above ... ------\
>>                          mux @ 0xc8 bit 24 --- gate @ 0xc8 bit 31
>> [ external oscillator ] -/
>>
>> If you choose to simplify the implementation, please include a detailed
>> note as to why you chose to do so, and the validity of the simplification.
>
>
> I think it can be fully implemented...
>
> But how should I call the internal clock controlled by the mux @ 0x34 bit
> 30?

sata-pll-mux?

ChenYu