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Date: Fri, 15 Jan 2016 11:22:52 -0300
From: Javier Martinez Canillas <javier@...hile0.org>
To: Heiko Stuebner <heiko@...ech.de>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Thierry Reding <treding@...dia.com>,
Alexandru Stan <amstan@...omium.org>,
Arnd Bergmann <arnd@...db.de>,
Brian Norris <briannorris@...omium.org>,
Douglas Anderson <dianders@...omium.org>, naobsd@...il.com,
Linux Kernel <linux-kernel@...r.kernel.org>,
linux-rockchip@...ts.infradead.org,
Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
mbrugger@...e.com, Dmitry Torokhov <dmitry.torokhov@...il.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, p.zabel@...gutronix.de,
Olof Johansson <olof@...om.net>, andy.yan@...k-chips.com,
romain.perier@...il.com, jic23@...nel.org
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: Add basic support for orion-r68
Hello Heiko,
On Fri, Jan 15, 2016 at 11:03 AM, Heiko Stuebner <heiko@...ech.de> wrote:
> Hi Javier,
>
> Am Freitag, 15. Januar 2016, 10:28:44 schrieb Javier Martinez Canillas:
>> This is not a complete review but I just wanted to comment on two
>> things that I noticed:
>
> same for me for now :-)
>
>
>> On Fri, Jan 15, 2016 at 10:06 AM, Matthias Brugger
>> <matthias.bgg@...il.com> wrote:
>>
>> [snip]
>>
>> > + };
>> > +
>> > + vcc_18: vcc18-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vcc_18";
>> > + regulator-min-microvolt = <1800000>;
>> > + regulator-max-microvolt = <1800000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_sys>;
>> > + };
>> > +
>> > + /* supplies both host and otg */
>> > + vcc_host: vcc-host-regulator {
>> > + compatible = "regulator-fixed";
>> > + gpio = <&gpio0 4 GPIO_ACTIVE_LOW>;
>> > + pinctrl-names = "default";
>> > + pinctrl-0 = <&host_vbus_drv>;
>> > + regulator-name = "vcc_host";
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_sys>;
>> > + };
>> > +
>> > + vccio_sd: vcc-io-sd-regulator {
>> > + regulator-name= "vccio_sd";
>> > + gpio = <&gpio0 9 GPIO_ACTIVE_LOW>;
>> > + regulator-min-microvolt = <3300000>;
>> > + regulator-max-microvolt = <3300000>;
>> > + };
>> > +
>> > + vcc_sd: vcc-sd-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vcc_sd";
>> > + gpio = <&gpio3 11 GPIO_ACTIVE_LOW>;
>> > + regulator-min-microvolt = <3300000>;
>> > + regulator-max-microvolt = <3300000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_io>;
>> > + };
>> > +
>> > + vcc_io: vcc-io-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vcc_io";
>> > + regulator-min-microvolt = <3300000>;
>> > + regulator-max-microvolt = <3300000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_sys>;
>> > + };
>> > +
>> > + vcc_lan: vcc-lan-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vcc_lan";
>> > + regulator-min-microvolt = <3300000>;
>> > + regulator-max-microvolt = <3300000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_io>;
>> > + };
>> > +
>> > + vcc_sys: vcc-sys-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vcc_sys";
>> > + regulator-min-microvolt = <5000000>;
>> > + regulator-max-microvolt = <5000000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + };
>> > +
>> > + vccio_wl: vccio-wl-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vccio_wl";
>> > + regulator-min-microvolt = <3300000>;
>> > + regulator-max-microvolt = <3300000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_io>;
>> > + };
>> > +
>> > + vdd_10: vdd-10-regulator {
>> > + compatible = "regulator-fixed";
>> > + regulator-name = "vdd_10";
>> > + regulator-min-microvolt = <1000000>;
>> > + regulator-max-microvolt = <1000000>;
>> > + regulator-always-on;
>> > + regulator-boot-on;
>> > + vin-supply = <&vcc_sys>;
>> > + };
>> > +};
>>
>> There is only one regulator that is not marked as always-on. This will
>> prevent the regulator subsystem to disable unused regulators. Do you
>> really need all of them to be always-on?
>
> I do believe the regulators should be more or less correct. Sadly there are
> no real schematics for that specific device available, but the reference
> design for rk3368-based tv-boxes uses a hirarchy of hard-wired individual
> regulators without any ability to control for most of them [aka always on].
>
> And due to the r68 not sporting any different real pmic, I'd believe the
> Orion will most likely also follow that scheme.
>
I see, thanks a lot for the clarification. But then in that case I
wonder what's the point of defining the gpio property in the fixed
regulator device nodes?
>
> Heiko
Best regards,
Javier
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