lkml.org 
[lkml]   [2017]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [linux-sunxi] Re: [PATCH v2 1/6] clk: sunxi-ng: Add sun4i/sun7i CCU driver
On Fri, Apr 21, 2017 at 3:59 AM, Priit Laes <plaes@plaes.org> wrote:
> On Fri, Apr 07, 2017 at 03:38:05PM +0200, Maxime Ripard wrote:
>> Hi Priit,
>>
>> On Tue, Apr 04, 2017 at 08:09:19PM +0000, Priit Laes wrote:
>> > > > +/* Not documented on A10 */
>> > > > +static SUNXI_CCU_GATE(pll_periph_sata_clk, "pll-periph-sata", "pll-periph",
>> > > > + 0x028, BIT(14), 0);
>> > >
>> > > The rate doesn't come from pll-periph directly, does it?
>> >
>> > So it uses hosc (24MHz parent clock) instead of pll-periph?
>>
>> I never looked too much at this, but it looks more like the input is
>> pll-periph-sata itself.
>
> OK, I think I have now fixed most of the issues thanks to Maxime and Chen-Yu
> and I'm almost ready to send out V3.
>
> From my side there is only single issue remaining - how to create "sata-ext"
> clock?
>
> [snip]
> static struct ccu_div pll_periph_sata_clk = {
> .enable = BIT(14),
> .div = _SUNXI_CCU_DIV(0, 2),
> .common = {
> .prediv = 6,
> .reg = 0x028,
> .features = CCU_FEATURE_ALL_PREDIV,
> .hw.init = CLK_HW_INIT("pll-periph-sata",
> "pll-periph-base",
> &ccu_nk_ops, 0),
> },
> };
>
> static const char* const sata_parents[] = {"pll-periph-sata", "sata-ext"};
> static SUNXI_CCU_MUX_WITH_GATE(sata_clk, "sata", sata_parents,
> 0x0c8, 24, 1, BIT(31), 0);
> [/snip]
>
> Should I create a fixed-clock node in the dtsi:
>
> sata-ext: clk@0 {
> #clock-cells = <0>;
> compatible = "fixed-clock";
> clock-frequency = <200000000>;
> clock-output-names = "sata-ext";
> };

You can just leave it missing. You probably shouldn't register it
if it's not populated. The clk core can cope with missing parents,
as long as they aren't all missing.

>
> And would it also need pio definition?

Nope. It has dedicated pins.

ChenYu

\
 
 \ /
  Last update: 2017-04-21 03:50    [W:0.051 / U:0.520 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site