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SubjectRe: [linux-sunxi] Re: [PATCH v2 1/6] clk: sunxi-ng: Add sun4i/sun7i CCU driver
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";
};

And would it also need pio definition?

Päikest,
Priit :)

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