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Date: Thu, 21 Apr 2022 09:06:33 +0200
From: Philip Oberfichtner <pro@...x.de>
To: Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
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>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Winker Matthias <Matthias.Winker@...bosch.com>
Subject: Re: [PATCH 2/2] arm: dts: Add device tree for bosch acc board
On Tue, 2022-04-12 at 13:10 +0200, Krzysztof Kozlowski wrote:
> On 12/04/2022 12:19, Philip Oberfichtner wrote:
> > Add device tree for the Bosch ACC board, based on i.MX6 Dual.
> >
>
> Thank you for your patch. There is something to discuss/improve.
Hi Krzysztof,
thank you for the feedback. I will fix most of your comments in V2, but
there are open questions left:
>
> > + };
> > +
> > + backlight {
> > + status = "okay";
>
> Are you overriding any node? Looks like not, so status is not needed.
>
> > +
> > + compatible = "pwm-backlight";
> > + /* The last value is the PWM period in nano-seconds!
> > + * -> 5 kHz = 200 µS = 200.000 ns
> > + */
> > + pwms = <&pwm1 0 200000>;
> > + brightness-levels = <0 61 499 1706 4079 8022 13938
> > 22237 33328 47623 65535>;
> > + num-interpolated-steps = <10>;
> > + default-brightness-level = <60>;
> > + power-supply = <®_lcd0_pwr>;
> > + };
> > +
> > + usb3503_refclk: usb3503_refclk {
>
> hyphens in node names, not underscores. Node names should be generic,
> but if you need a specific prefix, it's ok.
>
> > + compatible = "fixed-factor-clock";
> > + #clock-cells = <0>;
> > +
> > + clocks = <&clks IMX6QDL_CLK_CKO2>;
> > + clock-div = <1>;
> > + clock-mult = <1>;
> > + clock-output-names = "12mhz_refclk";
> > +
> > + assigned-clocks = <&clks IMX6QDL_CLK_CKO>,
> > + <&clks IMX6QDL_CLK_CKO2>,
> > + <&clks IMX6QDL_CLK_CKO2_SEL>;
> > + assigned-clock-parents = <&clks IMX6QDL_CLK_CKO2>,
> > + <&clks IMX6QDL_CLK_CKO2_PODF>,
> > + <&clks IMX6QDL_CLK_OSC>;
> > + assigned-clock-rates = <0>, <12000000>, <0>;
> > + };
> > +
> > + cpus {
> > + /* Override operating points with board-specific values
> > */
> > + cpu0: cpu@0 {
> > + operating-points = <
>
> Anything blocking from using OPP v2 bindings?
>
> > + /* kHz uV */
> > + 1200000 1275000
> > + 996000 1225000
> > + 852000 1225000
> > + 792000 1150000
> > + 396000 950000
> > + >;
> > + fsl,soc-operating-points = <
>
> This seems undocumented and actually - why do you need it if you have
> generic operating points?
The "operating-points" and "fsl,soc-operating-points" properties are
defined in imx6q.dtsi. We are just overwriting them here.
>
> > + /* ARM kHz SOC-PU uV */
> > + 1200000 1225000
> > + 996000 1175000
> > + 852000 1175000
> > + 792000 1150000
> > + 396000 1150000
> > + >;
> > + };
> > +
> > + cpu1: cpu@1 {
> > + operating-points = <
> > + /* kHz uV */
> > + 1200000 1275000
> > + 996000 1225000
> > + 852000 1225000
> > + 792000 1150000
> > + 396000 950000
> > + >;
> > + fsl,soc-operating-points = <
> > + /* ARM kHz SOC-PU uV */
> > + 1200000 1225000
> > + 996000 1175000
> > + 852000 1175000
> > + 792000 1150000
> > + 396000 1150000
> > + >;
> > + };
> > + };
> > +
> > + leds {
> > + compatible = "pwm-leds";
> > +
> > + led_red: red {
>
> Generic node names, so led-0.
>
> Add common properties for color and function.
>
> > + label = "red";
> > + max-brightness = <248>;
> > + default-state = "off";
> > + pwms = <&pwm2 0 500000>;
> > + };
> > +
> > + led_white: white {
>
> The same.
>
> > + label = "white";
> > + max-brightness = <248>;
> > + default-state = "off";
> > + pwms = <&pwm3 0 500000>;
> > + linux,default-trigger = "heartbeat";
> > + };
> > + };
> > +
> > + memory {
> > + reg = <0x10000000 0x40000000>;
> > + };
> > +
> > + regulators: regulators {
> > + compatible = "simple-bus";
> > + #address-cells = <1>;
> > + #size-cells = <0>;
>
> This should not be a bus. Instead "regulator-0" and so on.
>
> > +
> > + supply_5P0: regulator@0 {
> > + compatible = "regulator-fixed";
> > + reg = <0>;
>
> Please run `make dtbs_check` (see Docs for this) and fix the
> warnings.
> Please fix automated check warnings before using reviewers time.
I built with W=1 and used checkpatch.pl. But I'm having trouble using
make dtbs_check. Seems like I get all warnings for all possible dts. Is
there a way to get warnings for a single dt only?
Best regards,
Philip Oberfichtner
>
> > + regulator-name = "5P0";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5000000>;
> > + regulator-always-on;
>
> Why do you need it? There is no control here, it's only used as a
> supply
> for other uncontrollable regulators (unless I missed something).
>
> > + };
> > +
> > + supply_VIN: regulator@1 {
> > + compatible = "regulator-fixed";
> > + reg = <1>;
> > + regulator-name = "VIN";
> > + regulator-min-microvolt = <4500000>;
> > + regulator-max-microvolt = <4500000>;
> > + regulator-always-on;
> > + vin-supply = <&supply_5P0>;
> > + };
> > +
> > + reg_usb_otg_vbus: regulator@2 {
> > + compatible = "regulator-fixed";
> > + reg = <2>;
> > + regulator-name = "usb_otg_vbus";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5000000>;
> > + };
> > +
> > + reg_usb_h1_vbus: regulator@3 {
> > + compatible = "regulator-fixed";
> > + reg = <3>;
> > + regulator-name = "usb_h1_vbus";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5000000>;
> > + regulator-always-on;
> > + vin-supply = <&supply_5P0>;
> > + };
> > +
> > + supply_VSNVS_3V0: regulator@4 {
> > + compatible = "regulator-fixed";
> > + reg = <4>;
> > + regulator-name = "VSNVS_3V0";
> > + regulator-min-microvolt = <3000000>;
> > + regulator-max-microvolt = <3000000>;
> > + regulator-always-on;
> > + vin-supply = <&supply_5P0>;
> > + };
> > +
> > + reg_lcd0_pwr: regulator-lcd0-pwr {
> > + compatible = "regulator-fixed";
> > + regulator-name = "LCD0 POWER";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5000000>;
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_lcd_enable>;
> > + gpio = <&gpio3 23 GPIO_ACTIVE_HIGH>;
> > + enable-active-high;
> > + regulator-boot-on;
> > + };
> > +
> > + reg_usb_h2_vbus: regulator@6 {
> > + compatible = "regulator-fixed";
> > + reg = <6>;
> > + regulator-name = "usb_h2_vbus";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5000000>;
> > + vin-supply = <&supply_5P0> ;
> > + regulator-always-on;
> > + };
> > +
> > + supply_vref_dac: vref_dac {
>
> 1. No underscores in node names.
> 2. Did you compile dts with W=1 and fixed warnings?
>
>
> > + compatible = "regulator-fixed";
> > + regulator-name = "vref_dac";
> > + regulator-min-microvolt = <20000>;
> > + regulator-max-microvolt = <20000>;
> > + vin-supply = <&supply_5P0> ;
> > + regulator-boot-on;
> > + };
> > + };
> > +
> > + reset_gpio_led {
> > + compatible = "gpio-leds";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_reset_gpio_led>;
> > +
> > + reset {
> > + label = "red_reset";
> > + gpios = <&gpio5 18 0>;
> > + default-state = "off";
> > + };
> > + };
> > +
> > + soc {
> > + aips1: bus@...0000 {};
> > + };
> > +};
> > +
> > +®_arm {
> > + vin-supply = <&pmic_sw2>;
> > +};
> > +
> > +®_soc {
> > + vin-supply = <&pmic_sw1abc>;
> > +};
> > +
> > +®_vdd1p1 {
> > + vin-supply = <&supply_VSNVS_3V0>;
> > +};
> > +
> > +®_vdd2p5 {
> > + vin-supply = <&supply_VSNVS_3V0>;
> > +};
> > +
> > +®_vdd3p0 {
> > + vin-supply = <&supply_VSNVS_3V0>;
> > +};
> > +
> > +&audmux {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_audmux>;
> > + status = "okay";
> > +};
> > +
> > +&fec {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_enet>;
> > + status = "okay";
> > +
> > + clocks = <&clks IMX6QDL_CLK_ENET>,
> > + <&clks IMX6QDL_CLK_ENET>,
> > + <&clks IMX6QDL_CLK_ENET>,
> > + <&clks IMX6QDL_CLK_ENET_REF>;
> > + clock-names = "ipg", "ahb", "ptp", "enet_out";
> > + phy-mode = "rmii";
> > + phy-supply = <&supply_sw4_3V3>;
> > + phy-handle = <ðphy>;
> > +
> > + mdio {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + ethphy: ethernet-phy@0 {
> > + compatible = "ethernet-phy-ieee802.3-c22";
> > + reg = <0>;
> > + interrupt-parent = <&gpio1>;
> > + interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
> > + smsc,disable-energy-detect;
> > + };
> > + };
> > +};
> > +
> > +
>
> No need for two blank lines.
>
> > +&gpu_vg {
> > + status = "disabled";
> > +};
> > +
> > +&gpu_2d {
> > + status = "disabled";
> > +};
> > +
> > +&i2c1 {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_i2c1>;
> > + clock-frequency = <400000>;
> > + status = "okay";
> > +
> > + eeprom: eeprom@50 {
> > + compatible = "atmel,24c32";
> > + reg = <0x50>;
> > + pagesize = <32>;
> > + bytelen = <4096>;
> > + bus-id = <0>;
> > + flags = <0x80>; /* AT24_FLAG_ADDR16 */
> > + };
> > +
> > + lm75: lm75@49 {
>
> Generic node name.
>
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_lm75>;
> > +
> > + compatible = "national,lm75b";
> > + reg = <0x49>;
> > +
> > + interrupts = <7 0x4>;
> > + interrupt-parent = <&gpio4>;
> > + };
> > +
> > + pmic: pfuze100@8 {
>
> pmic, not pfuze
>
> > + compatible = "fsl,pfuze100";
> > + reg = <0x08>;
> > + uboot,bootcounter;
>
> Do not add undocumented properties. Please check all entire DTS for
> such
> undocumented stuff.
>
> > +
> > + VGEN1-supply = <&supply_AUX_3V15>;
> > + VGEN2-supply = <&supply_AUX_3V15>;
> > + VGEN3-supply = <&supply_sw4_3V3>;
> > + VGEN4-supply = <&supply_sw4_3V3>;
> > + VGEN5-supply = <&supply_SYS_4V2>;
> > + VGEN6-supply = <&supply_SYS_4V2>;
> > +
> > + VREFDDR-supply = <&supply_DDR_1V5>;
> > +
> > + SW1AB-supply = <&supply_SYS_4V2>;
> > + SW1C-supply = <&supply_SYS_4V2>;
> > + SW2-supply = <&supply_SYS_4V2>;
> > + SW3A-supply = <&supply_SYS_4V2>;
> > + SW3B-supply = <&supply_SYS_4V2>;
> > + SW4-supply = <&supply_SYS_4V2>;
> > +
> > + regulators {
> > + /*
> > + * VDD_CORE is connected to SW1 ABC
> > + * We need to define sw1ab and sw1c, but later
> > it is controlled solely with
> > + * sw1c and therefore only this is named
> > "VDD_SOC".
> > + * See PMIC datasheet Rev. 18, chapter
> > 6.4.4.3.1: "The feedback and all
> > + * other controls are accomplished by use of
> > pin SW1CFB and SW1C control
> > + * registers, respectively."
> > + * Setting min and max according to SOC
> > datasheet
> > + */
> > + pmic_sw1abc: sw1c {
> > + regulator-name = "VDD_SOC (sw1abc)";
> > + regulator-min-microvolt = <1275000>;
> > + regulator-max-microvolt = <1500000>;
> > + regulator-boot-on;
> > + regulator-always-on;
> > + regulator-ramp-delay = <6250>;
> > +
> > + default-voltage = <1300000>;
> > + };
> > +
> > + pmic_sw2: sw2{
>
> Missing space.
>
> > + regulator-name = "VDD_ARM (sw2)";
> > +
>
> Why blank line here and not in other places?
>
> > + regulator-min-microvolt = <1050000>;
> > + regulator-max-microvolt = <1500000>;
> > + regulator-boot-on;
> > + regulator-always-on;
> > + regulator-ramp-delay = <6250>;
> > +
> > + default-voltage = <1300000>;
> > + };
> > +
> > + pmic_sw3a: sw3a {
> > + /* U-Boot sets correct voltage, shall
> > not be touched by the OS */
> > + compatible = "regulator-fixed";
> > + regulator-name = "DDR_1V5a";
> > + regulator-boot-on;
> > + regulator-always-on;
> > +
> > + };
> > +
> > + supply_DDR_1V5: sw3b {
> > + /* U-Boot sets correct voltage, shall
> > not be touched by the OS */
> > + compatible = "regulator-fixed";
> > + regulator-name = "DDR_1V5b";
> > + regulator-boot-on;
> > + regulator-always-on;
> > +
> > + };
> > +
> > + supply_AUX_3V15: sw4 {
> > + regulator-name = "AUX 3V15 (sw4)";
> > + regulator-min-microvolt = <800000>;
> > + regulator-max-microvolt = <3300000>;
> > +
> > + default-voltage = <3150000>;
> > +
> > + };
> > +
> > + swbst_reg: swbst {
> > + status = "disabled";
> > + regulator-min-microvolt = <5000000>;
> > + regulator-max-microvolt = <5150000>;
> > + regulator-boot-on;
> > + regulator-always-on;
> > +
> > + };
> > +
> > + snvs_reg: vsnvs {
> > + regulator-min-microvolt = <1200000>;
> > + regulator-max-microvolt = <3000000>;
> > + regulator-boot-on;
> > + regulator-always-on;
> > +
> > + default-voltage = <3000000>;
> > + };
> > +
> > + vref_reg: vrefddr {
> > + regulator-boot-on;
> > + regulator-always-on;
> > +
> > + default-voltage = <675000>;
> > + };
> > +
> > + vgen1_reg: vgen1 {
> > + regulator-min-microvolt = <800000>;
> > + regulator-max-microvolt = <1550000>;
> > + regulator-always-on;
> > +
> > + default-voltage = <1500000>;
> > + };
> > +
> > + vgen2_reg: vgen2 {
> > + regulator-min-microvolt = <800000>;
> > + regulator-max-microvolt = <1550000>;
> > + regulator-always-on;
> > +
> > + default-voltage = <1200000>;
> > + };
> > +
> > + vgen3_reg: vgen3 {
> > + regulator-min-microvolt = <1800000>;
> > + regulator-max-microvolt = <3300000>;
> > + regulator-always-on;
> > +
> > + default-voltage = <2500000>;
> > + };
> > +
> > + vgen4_reg: vgen4 {
> > + regulator-min-microvolt = <1800000>;
> > + regulator-max-microvolt = <3300000>;
> > + regulator-always-on;
> > + regulator-boot-on;
> > +
> > + default-voltage = <1800000>;
> > + };
> > +
> > + vgen5_reg: vgen5 {
> > + regulator-min-microvolt = <1800000>;
> > + regulator-max-microvolt = <3300000>;
> > + regulator-always-on;
> > + regulator-boot-on;
> > +
> > + default-voltage = <2800000>;
> > + };
> > +
> > + vgen6_reg: vgen6 {
> > + regulator-min-microvolt = <1800000>;
> > + regulator-max-microvolt = <3300000>;
> > + regulator-always-on;
> > +
> > + default-voltage = <2800000>;
> > + };
> > +
> > + };
> > + };
> > +
> > + rtc: rtcpcf8563@51 {
>
> Generic node names.
>
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_rtc>;
> > +
> > + compatible = "nxp,pcf8563";
> > + reg = <0x51>;
> > + };
> > +};
> > +
> > +&i2c2 {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_i2c2>;
> > + clock-frequency = <100000>;
> > + status = "okay";
> > +
> > + adc101c: ac101c@54 {
>
> Ugh...
>
> > + compatible = "ti,adc101c";
> > + reg = <0x54>;
> > + status = "okay";
> > + vref-supply = <&supply_vref_dac>;
> > + vcc-supply = <&supply_vref_dac>;
> > + };
> > +
> > + ad5602: ad5602@c {
> > + compatible = "adi,ad5602";
> > + reg = <0x0c>;
> > + status = "okay";
> > + vcc-supply = <&supply_vref_dac>;
> > + };
> > +
> > + eeprom_ext: eeprom_ext@50 {
>
> Generic node names, no underscores in node names.
>
> OK, I'll stop for now. :)
>
>
> Best regards,
> Krzysztof
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