linux-kernel - Re: [PATCH v1 1/6] arm64: dts: meson: a1: introduce PLL and Peripherals clk controllers

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Date:   Wed, 28 Jun 2023 17:18:39 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     <neil.armstrong@...aro.org>, <jbrunet@...libre.com>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <khilman@...libre.com>, <conor+dt@...nel.org>,
        <kernel@...rdevices.ru>, <sdfw_system_team@...rdevices.ru>,
        <rockosov@...il.com>, <linux-amlogic@...ts.infradead.org>,
        <linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 1/6] arm64: dts: meson: a1: introduce PLL and
 Peripherals clk controllers

Hello Martin,

Thank you for the review!

On Sun, Jun 25, 2023 at 11:00:06PM +0200, Martin Blumenstingl wrote:
> On Wed, Jun 7, 2023 at 10:16 PM Dmitry Rokosov <ddrokosov@...rdevices.ru> wrote:
> >
> > This patch adds clkc and clkc_pll dts nodes to A1 SoC main dtsi.
> > The first one clk controller is responsible for all SoC peripherals
> > clocks excluding audio clocks. The second one clk controller is used by
> > A1 SoC PLLs. Actually, there are two different APB heads, so we have two
> > different drivers.
> >
> > Signed-off-by: Dmitry Rokosov <ddrokosov@...rdevices.ru>
> > ---
> >  arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 26 +++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> > index eed96f262844..a24228808c9c 100644
> > --- a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> > +++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
> > @@ -6,6 +6,8 @@
> >  #include <dt-bindings/interrupt-controller/irq.h>
> >  #include <dt-bindings/interrupt-controller/arm-gic.h>
> >  #include <dt-bindings/gpio/meson-a1-gpio.h>
> > +#include <dt-bindings/clock/amlogic,a1-pll-clkc.h>
> > +#include <dt-bindings/clock/amlogic,a1-peripherals-clkc.h>
> >
> >  / {
> >         compatible = "amlogic,a1";
> > @@ -126,6 +128,30 @@ uart_AO_B: serial@...0 {
> >                                 status = "disabled";
> >                         };
> >
> > +                       clkc_periphs: clock-controller@800 {
> please keep the entries sorted - so &clkc_periphs should come after
> &periphs_pinctrl
> 

Sure

> > +                               compatible = "amlogic,a1-peripherals-clkc";
> > +                               reg = <0 0x800 0 0x104>;
> > +                               #clock-cells = <1>;
> > +                               clocks = <&clkc_pll CLKID_FCLK_DIV2>,
> > +                                        <&clkc_pll CLKID_FCLK_DIV3>,
> > +                                        <&clkc_pll CLKID_FCLK_DIV5>,
> > +                                        <&clkc_pll CLKID_FCLK_DIV7>,
> > +                                        <&clkc_pll CLKID_HIFI_PLL>,
> > +                                        <&xtal>;
> > +                               clock-names = "fclk_div2", "fclk_div3",
> > +                                             "fclk_div5", "fclk_div7",
> > +                                             "hifi_pll", "xtal";
> > +                       };
> [...]
> 
> >                         gpio_intc: interrupt-controller@...0 {
> note to self: at some point we'll have to re-order &gpio_intc, but
> that's out of scope for this patch

I have noticed that the 'meson-a1.dtsi' file contains unsorted items. As
part of the current patch series, I can re-order them to improve the dt
structure.

-- 
Thank you,
Dmitry