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

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Date:   Sat, 12 Aug 2017 12:51:17 +0800
From:   icenowy@...c.io
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     devicetree <devicetree@...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, 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

在 2017-08-12 12:04，Chen-Yu Tsai 写道：
> 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?

I choose to call it pll-sata-out, as the mux @ 0x34 bit 30 is called
"PLL_OUTPUT_SEL".

> 
> ChenYu
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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