linux-kernel - Re: [PATCH 2/2] arm64: dts: rockchip: Add basic support for orion-r68

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Date:	Fri, 15 Jan 2016 10:28:44 -0300
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Matthias Brugger <matthias.bgg@...il.com>
Cc:	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>,
	Heiko Stübner <heiko@...ech.de>,
	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 Matthias,

This is not a complete review but I just wanted to comment on two
things that I noticed:

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?

> +
> +&emmc {
> +       broken-cd;
> +       bus-width = <8>;
> +       cap-mmc-highspeed;
> +       disable-wp;
> +       mmc-pwrseq = <&emmc_pwrseq>;
> +       non-removable;

Non-removable assumes always present so there is no need for
broken-cd. In fact, these two properties are mutually exclusive
according to Documentation/devicetree/bindings/mmc/mmc.txt.

Best regards,
Javier