Re: [PATCH 1/3] arm64: dts: fsl: librem5: Add a device tree for the Librem5 devkit

[Angus Ainslie]

Hi Fabio,

On 2019-03-11 17:10, Fabio Estevam wrote:
> On Mon, Mar 11, 2019 at 8:47 PM Angus Ainslie (Purism) <angus@xxxxxxxx> 
> wrote:
>
> > +/ {
> > +       model = "Purism Librem 5 devkit 1.0";
> > +       compatible = "fsl,librem5-devkit", "fsl,imx8mq";
>
> This board is not manufactured by FSL/NXP, so it should be
> "purism,librem5-devkit", "fsl,imx8mq" instead.
>
> You should also add an entry for the purism vendor entry in
> Documentation/devicetree/bindings/vendor-prefixes.txt in a separate
> patch.

Thanks I'll add it in there.

> > +
> > +       chosen {
> > +               stdout-path = &uart1;
> > +       };
> > +
> > +       reg_usdhc2_vmmc: regulator-vsd-3v3 {
>
> The usual format would be:
>
> reg_usdhc2_vmmc: regulator-usdhc2-vmmc {

Ok

> > +               compatible = "regulator-fixed";
> > +               regulator-name = "VSD_3V3";
> > +               regulator-min-microvolt = <3300000>;
> > +               regulator-max-microvolt = <3300000>;
> > +               gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> > +               enable-active-high;
> > +               regulator-always-on;
>
> Always on? It would be better to pass this regulator inside the mmc 
> node.

This GPIO is a #disable line for the WLAN and if it goes low the module 
doesn't recover. Until we get the WLAN driver working after disable it's 
best to leave it always on.

> > +       };
> > +
> > +       reg_pwr_en: pwr_en {
>
> reg_pwr_en: regulator-pwr-en {

Ok

> > +               compatible = "regulator-fixed";
> > +               regulator-name = "PWR_EN";
> > +               regulator-min-microvolt = <3300000>;
> > +               regulator-max-microvolt = <3300000>;
> > +               gpio = <&gpio1 8 GPIO_ACTIVE_HIGH>;
> > +               enable-active-high;
> > +               regulator-always-on;
>
> Same here. No need for "regulator-always-on" as it is controlled by
> the gyroscope.

This controls a regulator that feeds 80% of the peripherals on the board 
and we don't have all of the drivers in the devicetree yet. Shutting 
this off would during runtime would break the board so for now it needs 
to stay always on.

> > +&fec1 {
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&pinctrl_fec1>;
> > +       phy-mode = "rgmii-id";
> > +       phy-handle = <&ethphy0>;
> > +       fsl,magic-packet;
> > +       status = "okay";
> > +       phy-supply = <&reg_pwr_en>;
> > +
> > +       mdio {
> > +               #address-cells = <1>;
> > +               #size-cells = <0>;
> > +
> > +               ethphy0: ethernet-phy@0 {
> > +                       compatible = "ethernet-phy-ieee802.3-c22";
> > +                       reg = <1>;
>
> You pass @0 and use reg = <1>, which is a mismatch. Building it with
> W=1 would have warned you about this mismatch.

Thanks I'll fix that

> > +                       at803x,led-act-blind-workaround;
> > +                       at803x,eee-disabled;
> > +                       power-supply = <&reg_pwr_en>;
> > +               };
> > +       };
> > +};
> > +
> > +&iomuxc {
> > +       imx8m-som {
>
> No need for this imx8m-som level.
>
>
> > +               pinctrl_nc: ncgrp {
>
> Not a very descriptive naming.

Ok , this was my list of not connected pins but it should be removed.

> > +                       fsl,pins = <
> > +                       MX8MQ_IOMUXC_SAI1_MCLK_SAI1_MCLK        0x00
> > +                       MX8MQ_IOMUXC_I2C4_SCL_I2C4_SCL          
> > 0x4000007f
> > +                       MX8MQ_IOMUXC_I2C4_SDA_I2C4_SDA          
> > 0x4000007f
> > +                       >;
> > +               };
> > +
> > +               pinctrl_up: upgrp {
>
> Same here. Also, this is not used. Please remove it.

Ok

> > +                       fsl,pins = <
> > +                       MX8MQ_IOMUXC_SAI1_TXD2_SAI1_TX_DATA2           
> >  0x00
> > +                       >;
> > +               };
> > +
> > +               pinctrl_csi1: csi1grp {
>
> This is not used at the moment. Please remove it and re-add it when
> CSI gets supported.

Ok

> > +                       fsl,pins = <
> > +                       /* CSI_nRST */
> > +                       MX8MQ_IOMUXC_GPIO1_IO06_GPIO1_IO6              
> >  0x11
> > +                       /* CSI_PWDN */
> > +                       MX8MQ_IOMUXC_GPIO1_IO07_GPIO1_IO7              
> >  0x19
> > +                       /* CLK01 */
> > +                       MX8MQ_IOMUXC_GPIO1_IO14_CCMSRCGPCMIX_CLKO1     
> >  0x19
> > +                       >;
> > +               };
> > +
> > +               pinctrl_pwr_en: pwr_engrp {
> > +                       fsl,pins = <
> > +                       MX8MQ_IOMUXC_GPIO1_IO08_GPIO1_IO8              
> >  0x06
> > +                       >;
> > +               };
> > +
> > +               pinctrl_wwan: wwan_grp {
>
> Not used. Please remove this one and all unused pinctrl nodes.

This one should have been used but I'll go through and checked the rest 
as well.

> > +&i2c1 {
> > +       clock-frequency = <400000>;
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&pinctrl_i2c1>;
> > +       status = "okay";
> > +
> > +       pmic: bd71837@4b {
>
> Node names should be generic: pmic@4b
>
> > +       typec_ptn5100: ptn5110@52 {
>
> Same here.

Ok

> > +       charger: 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
> > +               ti,termination-current = <66000>;  // 66mA
> > +               ti,precharge-current = <1300000>; // 1.3A
> > +               ti,minimum-sys-voltage = <2750000>; // 2.75V
> > +               ti,boost-voltage = <5000000>; // 5V
> > +               ti,boost-max-current = <50000>; // 50mA
>
> No // style comments, please/

Ok

> > +&i2c3 {
> > +       clock-frequency = <100000>;
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&pinctrl_i2c3>, <&pinctrl_imu>;
> > +       status = "okay";
> > +
> > +       lsm9d: lsm9d@6a {
> > +               compatible = "st,lsm9ds1-gyro";
>
> I don't find this binding.

Thanks

> > +               reg = <0x6a>;
> > +               interrupt-parent = <&gpio3>;
> > +               interrupts = <19 IRQ_TYPE_LEVEL_LOW>;
> > +               power-supply = <&reg_pwr_en>;
> > +       };
> > +};
>
> > +&uart4 { /* BT */
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&pinctrl_uart4>, <&pinctrl_bt>;
> > +       fsl,uart-has-rtscts;
>
> uart-has-rtscts is preferred.
>
> > +       /* resets = <&modem_reset>; */
>
> Please remove this line instead of commenting it out.

Ok

Thanks
Angus