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Message-ID: <MWHPR11MB169397E1C572642536803951EF799@MWHPR11MB1693.namprd11.prod.outlook.com>
Date: Tue, 30 Aug 2022 20:16:12 +0000
From: <Jerry.Ray@...rochip.com>
To: <krzysztof.kozlowski@...aro.org>, <robh+dt@...nel.org>,
<Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
<Ludovic.Desroches@...rochip.com>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 2/2] dts: arm: at91: Add SAMA5D3-EDS board
>On 30/08/2022 18:24, Jerry Ray wrote:
>> The SAMA5D3-EDS board is an Ethernet Development Platform allowing for
>> evaluating many Microchip ethernet switch and PHY products. Various
>> daughter cards can connect up via an RGMII connector or an RMII connector.
>>
>
>Use subject prefixes matching the subsystem (git log --oneline -- ...).
>
>> The EDS board is not intended for stand-alone use and has no ethernet
>> capabilities when no daughter board is connected. As such, this
>> device tree is intended to be used with a DT overlay defining the add-on board.
>> To better ensure consistency, some items are defined here as a form of
>> documentation so that all add-on overlays will use the same terms.
>>
>> Google search keywords: "Microchip SAMA5D3-EDS"
>>
>> Signed-off-by: Jerry Ray <jerry.ray@...rochip.com>
>> ---
>> v4->v5:
>> - patch now applies to v6.0-rc2
>
>If this is rebased, why you did not CC me?
>
Apologies. Didn't update the mailing list from previous attempts.
>> v3->v4:
>> - Fixed regulators as necessary to get the board to boot from SD Card.
>> v2->v3:
>> - Alphabetized pinctrl entries.
>> - cleaned up a warning in the regulators section.
>> - License tweaked to 'OR MIT'
>> - Included Makefile change
>> v1->v2:
>> - Modified the compatible field in the device tree to reflect Microchip
>> Ethernet Development System Board.
>> ---
>> arch/arm/boot/dts/Makefile | 1 +
>> arch/arm/boot/dts/at91-sama5d3_eds.dts | 309
>> +++++++++++++++++++++++++
>> 2 files changed, 310 insertions(+)
>> create mode 100644 arch/arm/boot/dts/at91-sama5d3_eds.dts
>>
>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>> index 05d8aef6e5d2..e92e639a2dc3 100644
>> --- a/arch/arm/boot/dts/Makefile
>> +++ b/arch/arm/boot/dts/Makefile
>> @@ -61,6 +61,7 @@ dtb-$(CONFIG_SOC_SAM_V7) += \
>> at91-sama5d2_icp.dtb \
>> at91-sama5d2_ptc_ek.dtb \
>> at91-sama5d2_xplained.dtb \
>> + at91-sama5d3_eds.dtb \
>> at91-sama5d3_ksz9477_evb.dtb \
>> at91-sama5d3_xplained.dtb \
>> at91-dvk_som60.dtb \
>> diff --git a/arch/arm/boot/dts/at91-sama5d3_eds.dts
>> b/arch/arm/boot/dts/at91-sama5d3_eds.dts
>> new file mode 100644
>> index 000000000000..2e6d94b30916
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/at91-sama5d3_eds.dts
>> @@ -0,0 +1,309 @@
>> +// SPDX-License-Identifier: GPL-2.0+ OR MIT
>> +/*
>> + * at91-sama5d3_eds.dts - Device Tree file for the SAMA5D3 Ethernet
>> + * Development System board.
>> + *
>> + * Copyright (C) 2022 Microchip Technology Inc. and its subsidiaries
>> + * 2022 Jerry Ray <jerry.ray@...rochip.com>
>> + */
>> +/dts-v1/;
>> +#include "sama5d36.dtsi"
>> +
>> +/ {
>> + model = "SAMA5D3 Ethernet Development System";
>> + compatible = "microchip,sama5d3-eds", "atmel,sama5d3",
>> + "atmel,sama5";
>
>This does not match your bindings.
>
>> +
>> + chosen {
>> + stdout-path = "serial0:115200n8";
>> + };
>> +
>> + clocks {
>> + slow_xtal {
>
>No underscores in node names. Generic node names, so at least add some generic prefix or suffix, e.g.: "slow-xtal-clock"
>
I'm not at liberty to change these names. Pre-existing drivers are counting on them.
The hardware leverages the SAMA5D3-xplained board.
I'm leveraging the at91-sama5d3_xplained.dts.
The board will not boot up if I modify the names.
>> + clock-frequency = <32768>;
>> + };
>> +
>> + main_xtal {
>
>Ditto, e.g. main-xtal-clock
>
>> + clock-frequency = <12000000>;
>> + };
>> + };
>> +
>> + gpio_keys {
>
>No underscores...
>
>> + compatible = "gpio-keys";
>> +
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_key_gpio>;
>> +
>> + button-3 {
>> + label = "PB_USER";
>> + gpios = <&pioE 29 GPIO_ACTIVE_LOW>;
>> + linux,code = <0x104>;
>> + wakeup-source;
>> + };
>> + };
>> +
>> + memory@...00000 {
>> + reg = <0x20000000 0x10000000>;
>> + };
>> +
>> + vcc_3v3_reg: BUCK_REG1 {
>
>No, this coding style is very poor. No capital letters, no underscores.
>Use generic node names, e.g. "regulator-0".
>
>
I'll conform where I can with regards to style.
>> + compatible = "regulator-fixed";
>> + regulator-name = "VCC_3V3";
>> + regulator-min-microvolt = <3300000>;
>> + regulator-max-microvolt = <3300000>;
>> + regulator-always-on;
>> + };
>> +
>> + vcc_2v5_reg: LDO_REG2 {
>> + compatible = "regulator-fixed";
>> + regulator-name = "VCC_2V5";
>> + regulator-min-microvolt = <2500000>;
>> + regulator-max-microvolt = <2500000>;
>> + regulator-always-on;
>> + vin-supply = <&vcc_3v3_reg>;
>> + };
>> +
>> + vcc_1v8_reg: LDO_REG3 {
>> + compatible = "regulator-fixed";
>> + regulator-name = "VCC_1V8";
>> + regulator-min-microvolt = <1800000>;
>> + regulator-max-microvolt = <1800000>;
>> + regulator-always-on;
>> + vin-supply = <&vcc_3v3_reg>;
>> + };
>> +
>> + vcc_1v2_reg: BUCK_REG4 {
>> + compatible = "regulator-fixed";
>> + regulator-name = "VCC_1V2";
>> + regulator-min-microvolt = <1200000>;
>> + regulator-max-microvolt = <1200000>;
>> + regulator-always-on;
>> + };
>> +
>> + vcc_mmc0_reg: fixedregulator_mmc0 {
>
>Another different pattern of naming..
>
>> + compatible = "regulator-fixed";
>> + regulator-name = "mmc0-card-supply";
>> + regulator-min-microvolt = <3300000>;
>> + regulator-max-microvolt = <3300000>;
>> + regulator-always-on;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_vcc_mmc0_reg_gpio>;
>> + gpio = <&pioE 2 GPIO_ACTIVE_LOW>;
>> + };
>> +};
>> +
>> +&can0 {
>> + status = "okay";
>> +};
>> +
>> +&dbgu {
>> + status = "okay";
>> +};
>> +
>> +&ebi {
>> + pinctrl-0 = <&pinctrl_ebi_nand_addr>;
>> + pinctrl-names = "default";
>> + status = "okay";
>> +
>> + nand_controller: nand-controller {
>> + status = "okay";
>> +> + nand@3 {
>> + reg = <0x3 0x0 0x2>;
>> + atmel,rb = <0>;
>> + nand-bus-width = <8>;
>> + nand-ecc-mode = "hw";
>> + nand-ecc-strength = <4>;
>> + nand-ecc-step-size = <512>;
>> + nand-on-flash-bbt;
>> + label = "atmel_nand";
>> +
>> + partitions {
>> + compatible = "fixed-partitions";
>> + #address-cells = <1>;
>> + #size-cells = <1>;
>> +
>> + at91bootstrap@0 {
>> + label = "at91bootstrap";
>> + reg = <0x0 0x40000>;
>> + };
>> +
>> + bootloader@...00 {
>> + label = "bootloader";
>> + reg = <0x40000 0xc0000>;
>> + };
>> +
>> + bootloaderenvred@...000 {
>> + label = "bootloader env redundant";
>> + reg = <0x100000 0x40000>;
>> + };
>> +
>> + bootloaderenv@...000 {
>> + label = "bootloader env";
>> + reg = <0x140000 0x40000>;
>> + };
>> +
>> + dtb@...000 {
>> + label = "device tree";
>> + reg = <0x180000 0x80000>;
>> + };
>> +
>> + kernel@...000 {
>> + label = "kernel";
>> + reg = <0x200000 0x600000>;
>> + };
>> +
>> + rootfs@...000 {
>> + label = "rootfs";
>> + reg = <0x800000 0x0f800000>;
>> + };
>> + };
>> + };
>> + };
>> +};
>> +
>> +&i2c0 {
>> + pinctrl-0 = <&pinctrl_i2c0_pu>;
>> + status = "okay";
>> +};
>> +
>> +&i2c1 {
>> + status = "okay";
>> +};
>> +
>> +&i2c2 {
>> + dmas = <0>, <0>; /* Do not use DMA for i2c2 */
>
>Instead you need to remove the property.
>
>> + pinctrl-0 = <&pinctrl_i2c2_pu>;
>> + status = "okay";
>> +};
>> +
>> +&mmc0 {
>> + pinctrl-0 = <&pinctrl_mmc0_clk_cmd_dat0 &pinctrl_mmc0_dat1_3
>> + &pinctrl_mmc0_dat4_7 &pinctrl_mmc0_cd>;
>> + vmmc-supply = <&vcc_mmc0_reg>;
>> + vqmmc-supply = <&vcc_3v3_reg>;
>> + status = "okay";
>> + slot@0 {
>> + reg = <0>;
>> + bus-width = <8>;
>> + cd-gpios = <&pioE 0 GPIO_ACTIVE_LOW>;
>> + };
>> +};
>> +
>> +&pinctrl {
>> + board {
>> + pinctrl_i2c0_pu: i2c0_pu {
>
>No underscores in node names.
>
>> + atmel,pins =
>> + <AT91_PIOA 30 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>,
>> + <AT91_PIOA 31 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
>> + };
>> +
>> + pinctrl_i2c2_pu: i2c2_pu {
>> + atmel,pins =
>> + <AT91_PIOA 18 AT91_PERIPH_B AT91_PINCTRL_PULL_UP>,
>> + <AT91_PIOA 19 AT91_PERIPH_B AT91_PINCTRL_PULL_UP>;
>> + };
>> +
>> + pinctrl_key_gpio: key_gpio_0 {
>> + atmel,pins =
>> + <AT91_PIOE 29 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP_DEGLITCH>;
>> + };
>> +
>> + pinctrl_mmc0_cd: mmc0_cd {
>> + atmel,pins =
>> + <AT91_PIOE 0 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP_DEGLITCH>;
>> + };
>> +
>> + /* Reserved for reset signal to the RGMII connector. */
>> + pinctrl_rgmii_rstn: rgmii_rstn {
>> + atmel,pins =
>> + <AT91_PIOD 18 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP_DEGLITCH>;
>> + };
>> +
>> + /* Reserved for an interrupt line from the RMII and RGMII connectors. */
>> + pinctrl_spi_irqn: spi_irqn {
>> + atmel,pins =
>> + <AT91_PIOB 28 AT91_PERIPH_GPIO AT91_PINCTRL_DEGLITCH>;
>> + };
>> +
>> + pinctrl_spi0_cs: spi0_cs_default {
>> + atmel,pins =
>> + <AT91_PIOD 13 AT91_PERIPH_GPIO AT91_PINCTRL_NONE
>> + AT91_PIOD 16 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>> + };
>> +
>> + pinctrl_spi1_cs: spi1_cs_default {
>> + atmel,pins = <AT91_PIOC 25 AT91_PERIPH_GPIO AT91_PINCTRL_NONE
>> + AT91_PIOC 28 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>> + };
>> +
>> + pinctrl_usba_vbus: usba_vbus {
>> + atmel,pins =
>> + <AT91_PIOE 9 AT91_PERIPH_GPIO AT91_PINCTRL_DEGLITCH>;
>> + };
>> +
>> + pinctrl_usb_default: usb_default {
>> + atmel,pins =
>> + <AT91_PIOE 3 AT91_PERIPH_GPIO AT91_PINCTRL_NONE
>> + AT91_PIOE 4 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>> + };
>> +
>> + /* Reserved for VBUS fault interrupt. */
>> + pinctrl_vbusfault_irqn: vbusfault_irqn {
>> + atmel,pins =
>> + <AT91_PIOE 5 AT91_PERIPH_GPIO AT91_PINCTRL_DEGLITCH>;
>> + };
>> +
>> + pinctrl_vcc_mmc0_reg_gpio: vcc_mmc0_reg_gpio_default {
>> + atmel,pins = <AT91_PIOE 2 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP>;
>> + };
>> + };
>> +};
>> +
>> +&spi0 {
>> + pinctrl-names = "default", "cs";
>> + pinctrl-1 = <&pinctrl_spi0_cs>;
>> + cs-gpios = <&pioD 13 0>, <0>, <0>, <&pioD 16 0>;
>> + status = "okay";
>> +};
>> +
>> +&spi1 {
>> + pinctrl-names = "default", "cs";
>> + pinctrl-1 = <&pinctrl_spi1_cs>;
>> + cs-gpios = <&pioC 25 0>, <0>, <0>, <&pioC 28 0>;
>
>Use proper flags. What is <0>???
>
>
>> + status = "okay";
>> +};
>> +
>> +&tcb0 {
>> + timer0: timer@0 {
>> + compatible = "atmel,tcb-timer";
>> + reg = <0>;
>> + };
>> +
>> + timer1: timer@1 {
>> + compatible = "atmel,tcb-timer";
>> + reg = <1>;
>> + };
>> +};
>> +
>> +&usb0 {
>> + atmel,vbus-gpio = <&pioE 9 GPIO_ACTIVE_HIGH>;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_usba_vbus>;
>> + status = "okay";
>> +};
>> +
>> +&usb1 {
>> + atmel,vbus-gpio = <0
>
>What is this 0?
>
>> + &pioE 3 GPIO_ACTIVE_HIGH
>> + &pioE 4 GPIO_ACTIVE_HIGH
>
>Why two GPIOs?
>
>> + >;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_usb_default>;
>> + num-ports = <3>;
>> + status = "okay";
>> +};
>> +
>> +&usb2 {
>> + status = "okay";
>> +};
>
>
>Best regards,
>Krzysztof
>
Regards,
Jerry.
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