linux-kernel - Re: [PATCH v13 2/4] arm64: dts: fsl: librem5: Add a device tree for the Librem5 devkit

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Message-ID: <20190523191926.GB3803@xo-6d-61-c0.localdomain>
Date:   Thu, 23 May 2019 21:19:26 +0200
From:   Pavel Machek <pavel@....cz>
To:     "Angus Ainslie (Purism)" <angus@...ea.ca>
Cc:     angus.ainslie@...i.sm, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v13 2/4] arm64: dts: fsl: librem5: Add a device tree for
 the Librem5 devkit

Hi!

> - LEDs
> - gyro
> - magnetometer

> +	leds {
> +		compatible = "gpio-leds";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_gpio_leds>;
> +
> +		led1 {
> +			label = "LED 1";

So, what kind of LED do you have, and what color is it? label should probably be something like
notify:green.

> +	charger@6b { /* bq25896 */
> +		compatible = "ti,bq25890";
> +		reg = <0x6b>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_charger>;
> +		interrupt-parent = <&gpio3>;
> +		interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
> +		ti,battery-regulation-voltage = <4192000>; /* 4.192V */
> +		ti,charge-current = <1600000>; /* 1.6 A */

No space before A, for consistency.

> +		ti,termination-current = <66000>;  /* 66mA */
> +		ti,precharge-current = <1300000>; /* 1.3A */

I thought precharge is usually something low, because you are not yet sure of battery health...?

> +		ti,minimum-sys-voltage = <2750000>; /* 2.75V */

Are you sure? Normally systems shut down at 3.2V, 3V or so. Li-ion batteries don't
really like to be discharged _this_ deep.

										Pavel