linux-kernel - Re: [PATCH 3/3] clk: meson-g12a: Add EE Clock controller driver

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Date:   Mon, 16 Jul 2018 13:58:58 +0800
From:   Jian Hu <jian.hu@...ogic.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     Neil Armstrong <narmstrong@...libre.com>,
        <qianggui.song@...ogic.com>, <sboyd@...nel.org>,
        <khilman@...libre.com>, <mturquette@...libre.com>,
        <linux-kernel@...r.kernel.org>, <bo.yang@...ogic.com>,
        <qiufang.dai@...ogic.com>, <linux-arm-kernel@...ts.infradead.org>,
        <carlo@...one.org>, <linux-amlogic@...ts.infradead.org>,
        <sunny.luo@...ogic.com>, <linux-clk@...r.kernel.org>,
        <xingyu.chen@...ogic.com>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 3/3] clk: meson-g12a: Add EE Clock controller driver

Hi Jerome

On 2018/7/11 21:45, Jerome Brunet wrote:
> On Wed, 2018-07-11 at 21:41 +0800, Jian Hu wrote:
>>>>>> +static struct clk_regmap g12a_mpll0 = {
>>>>>> +       .data = &(struct clk_regmap_gate_data){
>>>>>> +               .offset = HHI_MPLL_CNTL1,
>>>>>> +               .bit_idx = 31,
>>>>>> +       },
>>>>>> +       .hw.init = &(struct clk_init_data){
>>>>>> +               .name = "mpll0",
>>>>>> +               .ops = &clk_regmap_gate_ops,
>>>>>> +               .parent_names = (const char *[]){ "mpll0_div" },
>>>>>> +               .num_parents = 1,
>>>>>> +               .flags = CLK_SET_RATE_PARENT,
>>>>>> +       },
>>>>>> +};
>>>
>>> The previous had a predivider (1 or 2) in front of these mpll. Even if the
>>> predivider is usually set to be a passthrough, it is better to model the tree
>>> correctly.
>>>
>>> Is this SoC any different ?
>>>
>>
>> I am not sure the difference, I will confirm with IC design guys.
> 
> I suggest that you have a look at the (upstream) axg and gxbb clock driver for
> this
> 
> Same goes for the fdiv gates.
> 
> Last, please trim your replies a bit. It will make easier to see what you are
> replying to.
> 
> .
> 

I have confirmed with IC design guys, axg and gxbb clock driver have a 
prediver in frount  of these mpll, according to the Spec, we can get the 
prediver function in HHI_MPLL_CNTL5 bit12, the G12A SoC have not the 
prediver function.