linux-kernel - Re: [PATCH 6/9] arm64: dts: rockchip: add missing rk3568 cru phandles

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Date:   Wed, 28 Jul 2021 16:41:06 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree@...r.kernel.org,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/9] arm64: dts: rockchip: add missing rk3568 cru phandles

Am Mittwoch, 28. Juli 2021, 16:18:49 CEST schrieb Peter Geis:
> On Wed, Jul 28, 2021 at 10:06 AM Heiko Stübner <heiko@...ech.de> wrote:
> >
> > Hi Peter,
> >
> > Am Mittwoch, 28. Juli 2021, 15:55:31 CEST schrieb Peter Geis:
> > > The grf and pmugrf phandles are necessary for the pmucru and cru to
> > > modify clocks. Add these phandles to permit adjusting the clock rates
> > > and muxes.
> > >
> > > Signed-off-by: Peter Geis <pgwipeout@...il.com>
> > > ---
> > >  arch/arm64/boot/dts/rockchip/rk356x.dtsi | 3 +++
> > >  1 file changed, 3 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > index 0905fac0726a..8ba0516eedd8 100644
> > > --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > @@ -218,6 +218,8 @@ grf: syscon@...60000 {
> > >       pmucru: clock-controller@...00000 {
> > >               compatible = "rockchip,rk3568-pmucru";
> > >               reg = <0x0 0xfdd00000 0x0 0x1000>;
> > > +             rockchip,grf = <&grf>;
> > > +             rockchip,pmugrf = <&pmugrf>;
> >
> > I don't think the pmucru needs both and in fact the mainline
> > clock driver should just reference its specific grf at all, i.e.
> >         pmucru -> pmugrf (via the rockchip,grf handle)
> >         cru -> grf
> >
> > I've not seen anything breaking this scope so far.
> 
> I thought the same thing as well, but for some reason the driver
> refuses to apply assigned-clocks to the plls unless these are all
> present.
> If the driver can get these assignments automatically eventually,
> perhaps it's a loading order issue?
> 
> Thinking about it, it's probably the grf and pmugrf haven't probed
> when the driver is attempting to assign these, and tying them together
> forces the probe to happen first.

though nothing references the regular grf from the pmucru I think.

I.e. the pmucru PLL read their lock state from RK3568_PMU_MODE_CON

The rk3568 reuses the pll_rk3328-type which in turn is a modified pll_rk3036
and uses their ops. Which in turn means the pll shouldn't access the GRF at
all, as it uses the pll's own register to check the locked state.

Can you try to change clk-pll.c from

	switch (pll_type) {
	case pll_rk3036:
	case pll_rk3328:
		if (!pll->rate_table || IS_ERR(ctx->grf))
			init.ops = &rockchip_rk3036_pll_clk_norate_ops;
...
to
	switch (pll_type) {
	case pll_rk3036:
	case pll_rk3328:
		if (!pll->rate_table)
			init.ops = &rockchip_rk3036_pll_clk_norate_ops;

similar to rk3399?

Heiko

> > >               #clock-cells = <1>;
> > >               #reset-cells = <1>;
> > >       };
> > > @@ -225,6 +227,7 @@ pmucru: clock-controller@...00000 {
> > >       cru: clock-controller@...20000 {
> > >               compatible = "rockchip,rk3568-cru";
> > >               reg = <0x0 0xfdd20000 0x0 0x1000>;
> > > +             rockchip,grf = <&grf>;
> > >               #clock-cells = <1>;
> > >               #reset-cells = <1>;
> > >       };
> > >
> >
> >
> >
> >
>