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

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Date:   Fri, 24 May 2019 15:00:05 -0700
From:   Angus Ainslie <angus@...ea.ca>
To:     Pavel Machek <pavel@....cz>
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 Pavel,

On 2019-05-23 12:19, Pavel Machek wrote:
> 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.
> 

As we don't have a specific use for these yet does it really matter if 
there is a colour or a number associated with them ?

>> +	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...?
> 

I think I put that in incorrectly. The intention was 130mA.

>> +		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.

You are correct. I'll fix it for the next version.

Thanks
Angus

> 
> 										Pavel