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

From: Javier Martinez Canillas <javier@dowhile0.org>
To: Matthias Brugger <matthias.bgg@gmail.com>
Cc: "Rob Herring" <robh+dt@kernel.org>,
	"Pawel Moll" <pawel.moll@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Ian Campbell" <ijc+devicetree@hellion.org.uk>,
	"Kumar Gala" <galak@codeaurora.org>,
	"Heiko Stübner" <heiko@sntech.de>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will.deacon@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"Thierry Reding" <treding@nvidia.com>,
	"Alexandru Stan" <amstan@chromium.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Brian Norris" <briannorris@chromium.org>,
	"Douglas Anderson" <dianders@chromium.org>,
	naobsd@gmail.com, "Linux Kernel" <linux-kernel@vger.kernel.org>,
	linux-rockchip@lists.infradead.org,
	"Sjoerd Simons" <sjoerd.simons@collabora.co.uk>,
	mbrugger@suse.com, "Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	p.zabel@pengutronix.de, "Olof Johansson" <olof@lixom.net>,
	andy.yan@rock-chips.com, romain.perier@gmail.com,
	jic23@kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: Add basic support for orion-r68
Date: Fri, 15 Jan 2016 10:28:44 -0300	[thread overview]
Message-ID: <CABxcv=m+hK3xS8_fYNns-xE5DaLHD0D_Yj8McjM72Y_5V=YmSw@mail.gmail.com> (raw)
In-Reply-To: <1452863192-29231-2-git-send-email-matthias.bgg@gmail.com>

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@gmail.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