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Message-ID: <c2f5943b-cc0c-4cec-a9b4-1260d100cca7@microchip.com>
Date: Fri, 8 Mar 2024 09:48:35 +0000
From: <Varshini.Rajendran@...rochip.com>
To: <claudiu.beznea@...on.dev>, <robh+dt@...nel.org>,
<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
<Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
<andre.przywara@....com>, <gregory.clement@...tlin.com>,
<linus.walleij@...aro.org>, <baruch@...s.co.il>, <Mihai.Sain@...rochip.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 39/39] ARM: dts: at91: sam9x75_curiosity: add sam9x75
curiosity board
Hi Claudiu,
On 03/03/24 5:49 pm, claudiu beznea wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> s/ARM: dts: at91/ARM: dts: microchip
>
> in title.
>
> On 23.02.2024 19:31, Varshini Rajendran wrote:
>> Add device tree file for sam9x75 curiosity board.
>>
>> Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
>> ---
>> Changes in v4:
>> - Removed full node paths
>> - Renamed Leds with color names
>> - Corrected regulator node names
>> - Added support for classd and i2s nodes and their corresponding
>> pinctrl nodes
>> - Dropped USB nodes owing to the discussion here
>> https://lore.kernel.org/linux-devicetree/CAL_JsqJ9PrX6fj-EbffeJce09MXs=B7t+KS_kOinxaRx38=WxA@mail.gmail.com/
>> (Explained elaborately in the cover letter)
>> - Updated the linux,code property with the necessary value
>> ---
>> arch/arm/boot/dts/microchip/Makefile | 3 +
>> .../dts/microchip/at91-sam9x75_curiosity.dts | 309 ++++++++++++++++++
>> 2 files changed, 312 insertions(+)
>> create mode 100644 arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
>>
>> diff --git a/arch/arm/boot/dts/microchip/Makefile b/arch/arm/boot/dts/microchip/Makefile
>> index efde9546c8f4..5b3d518da319 100644
>> --- a/arch/arm/boot/dts/microchip/Makefile
>> +++ b/arch/arm/boot/dts/microchip/Makefile
>> @@ -12,6 +12,7 @@ DTC_FLAGS_at91-sama5d3_eds := -@
>> DTC_FLAGS_at91-sama5d3_xplained := -@
>> DTC_FLAGS_at91-sama5d4_xplained := -@
>> DTC_FLAGS_at91-sama7g5ek := -@
>> +DTC_FLAGS_at91-sam9x75_curiosity := -@
>
> Keep it alphanumerically sorted, thus after sam9x60 entry.
>
>> dtb-$(CONFIG_SOC_AT91RM9200) += \
>> at91rm9200ek.dtb \
>> mpa1600.dtb
>> @@ -59,6 +60,8 @@ dtb-$(CONFIG_SOC_AT91SAM9) += \
>> dtb-$(CONFIG_SOC_SAM9X60) += \
>> at91-sam9x60_curiosity.dtb \
>> at91-sam9x60ek.dtb
>> +dtb-$(CONFIG_SOC_SAM9X7) += \
>> + at91-sam9x75_curiosity.dtb
>> dtb-$(CONFIG_SOC_SAM_V7) += \
>> at91-kizbox2-2.dtb \
>> at91-kizbox3-hs.dtb \
>> diff --git a/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
>> new file mode 100644
>> index 000000000000..be37022d3d05
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/microchip/at91-sam9x75_curiosity.dts
>> @@ -0,0 +1,309 @@
>> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>> +/*
>> + * at91-sam9x75_curiosity.dts - Device Tree file for Microchip SAM9X75 Curiosity board
>> + *
>> + * Copyright (C) 2023 Microchip Technology Inc. and its subsidiaries
>> + *
>> + * Author: Varshini Rajendran <varshini.rajendran@...rochip.com>
>> + */
>> +/dts-v1/;
>> +#include "sam9x7.dtsi"
>> +#include <dt-bindings/input/input.h>
>> +
>> +/ {
>> + model = "Microchip SAM9X75 Curiosity";
>> + compatible = "microchip,sam9x75-curiosity", "microchip,sam9x7", "atmel,at91sam9";
>> +
>> + aliases {
>> + i2c0 = &i2c6;
>> + };
>> +
>> + chosen {
>> + stdout-path = "serial0:115200n8";
>> + };
>> +
>> + gpio-keys {
>> + compatible = "gpio-keys";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_key_gpio_default>;
>> +
>> + button-user {
>> + label = "USER";
>> + gpios = <&pioC 9 GPIO_ACTIVE_LOW>;
>> + linux,code = <KEY_0>;
>> + wakeup-source;
>> + };
>> + };
>> +
>> + leds {
>> + compatible = "gpio-leds";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_led_gpio_default>;
>> +
>> + led-red {
>> + label = "red";
>> + gpios = <&pioC 19 GPIO_ACTIVE_HIGH>;
>> + };
>> +
>> + led-green {
>> + label = "green";
>> + gpios = <&pioC 21 GPIO_ACTIVE_HIGH>;
>> + };
>> +
>> + led-blue {
>> + label = "blue";
>> + gpios = <&pioC 20 GPIO_ACTIVE_HIGH>;
>> + linux,default-trigger = "heartbeat";
>> + };
>> + };
>> +
>> + memory@...00000 {
>> + device_type = "memory";
>> + reg = <0x20000000 0x10000000>;
>> + };
>> +};
>> +
>> +&classd {
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_classd>;
>> + atmel,pwm-type = "diff";
>> + atmel,non-overlap-time = <10>;
>> + status = "okay";
>> +};
>> +
>> +&dbgu {
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_dbgu>;
>> + status = "okay";
>> +};
>> +
>> +&dma0 {
>> + status = "okay";
>> +};
>> +
>> +&flx6 {
>> + atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
>> + status = "okay";
>> +};
>> +
>> +&i2c6 {
>
> I don't know if you got any review comments w/ regards to this in the
> previous email but having flexcoms and inner node grouped together is
> easier to follow (at least to me). e.g.:
>
Yes, I received a comment not to duplicate nodes.
https://patchwork.kernel.org/project/linux-mmc/patch/20230623203056.689705-46-varshini.rajendran@microchip.com/
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_flx6_default>;
>> + i2c-analog-filter;
>> + i2c-digital-filter;
>> + i2c-digital-filter-width-ns = <35>;
>> + status = "okay";
>> +
>> + pmic@5b {
>> + compatible = "microchip,mcp16502";
>> + reg = <0x5b>;
>> +
>> + regulators {
>> + vdd_3v3: VDD_IO {
>> + regulator-name = "VDD_IO";
>> + regulator-min-microvolt = <3000000>;
>> + regulator-max-microvolt = <3600000>;
>
> I can't find the schematics for this but these values here should reflect
> the voltage that the board support not the ones that the PMIC itself
> supports. Valid for all the other regulators.
>
Okay. I will double check this with hardware experts as well.
>
>> + regulator-initial-mode = <2>;
>> + regulator-allowed-modes = <2>, <4>;
>> + regulator-always-on;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + regulator-mode = <4>;
>> + };
>> +
>> + regulator-state-mem {
>> + regulator-mode = <4>;
>> + };
>> + };
>> +
>> + vddioddr: VDD_DDR {
>> + regulator-name = "VDD_DDR";
>> + regulator-min-microvolt = <1283000>;
>> + regulator-max-microvolt = <1450000>;
>> + regulator-initial-mode = <2>;
>> + regulator-allowed-modes = <2>, <4>;
>> + regulator-always-on;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + regulator-mode = <4>;
>> + };
>> +
>> + regulator-state-mem {
>> + regulator-on-in-suspend;
>> + regulator-mode = <4>;
>> + };
>> + };
>> +
>> + vddcore: VDD_CORE {
>> + regulator-name = "VDD_CORE";
>> + regulator-min-microvolt = <500000>;
>> + regulator-max-microvolt = <1210000>;
>> + regulator-initial-mode = <2>;
>> + regulator-allowed-modes = <2>, <4>;
>> + regulator-always-on;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + regulator-mode = <4>;
>> + };
>> +
>> + regulator-state-mem {
>> + regulator-mode = <4>;
>> + };
>> + };
>> +
>> + vddcpu: VDD_OTHER {
>> + regulator-name = "VDD_OTHER";
>> + regulator-min-microvolt = <1700000>;
>> + regulator-max-microvolt = <3600000>;
>> + regulator-initial-mode = <2>;
>> + regulator-allowed-modes = <2>, <4>;
>> + regulator-ramp-delay = <3125>;
>> + regulator-always-on;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + regulator-mode = <4>;
>> + };
>> +
>> + regulator-state-mem {
>> + regulator-mode = <4>;
>> + };
>> + };
>> +
>> + vldo1: LDO1 {
>> + regulator-name = "LDO1";
>> + regulator-min-microvolt = <1200000>;
>> + regulator-max-microvolt = <3700000>;
>> + regulator-always-on;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + };
>> + };
>> +
>> + vldo2: LDO2 {
>> + regulator-name = "LDO2";
>> + regulator-min-microvolt = <1200000>;
>> + regulator-max-microvolt = <3700000>;
>> +
>> + regulator-state-standby {
>> + regulator-on-in-suspend;
>> + };
>> + };
>> + };
>> + };
>> +};
>> +
>> +&i2s {
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_i2s_default>;
>> + #sound-dai-cells = <0>;
>> + status = "disabled";
>
> Any reason this is disabled?
There is a conflict. My bad, I missed mentioning it since the other node
support is not added yet. I will add it in the next version.
>
>> +};
>> +
>> +&main_xtal {
>> + clock-frequency = <24000000>;
>> +};
>> +
>> +&pinctrl {
>> +
>
> This line could be removed.
>
>> + classd {
>> + pinctrl_classd: classd {
>> + atmel,pins =
>> + <AT91_PIOA 18 AT91_PERIPH_C AT91_PINCTRL_PULL_UP
>
> Try to be compliant with coding style from here (valid everywhere):
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/dts-coding-style.rst#n167
>
>> + AT91_PIOA 19 AT91_PERIPH_C AT91_PINCTRL_PULL_DOWN>;
>> + };
>> + };
>> +
>> + dbgu {
>> + pinctrl_dbgu: dbgu-0 {
>
> usually pinctrl label is something like the following in Microchip AT91 DTSes:
> pinctrl_<ip-name>_default and node name is <ip-name>-default.
>
> Please use the same rule everywhere.
>
>> + atmel,pins = <AT91_PIOA 26 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
>> + AT91_PIOA 27 AT91_PERIPH_A AT91_PINCTRL_NONE>;
>> + };
>> + };
>> +
>> + flexcom {
>> + pinctrl_flx6_default: flx6-twi {
>> + atmel,pins =
>> + <AT91_PIOA 24 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
>> + AT91_PIOA 25 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
>> + };
>> + };
>> +
>> + gpio-keys {
>> + pinctrl_key_gpio_default: key-gpio-default {
>> + atmel,pins = <AT91_PIOC 9 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>> + };
>> + };
>> +
>> + i2s {
>> + pinctrl_i2s_default: i2s {
>> + atmel,pins =
>> + <AT91_PIOB 26 AT91_PERIPH_D AT91_PINCTRL_NONE /* I2SCK */
>> + AT91_PIOB 15 AT91_PERIPH_D AT91_PINCTRL_NONE /* I2SWS */
>> + AT91_PIOB 16 AT91_PERIPH_D AT91_PINCTRL_NONE /* I2SDIN */
>> + AT91_PIOB 17 AT91_PERIPH_D AT91_PINCTRL_NONE /* I2SDOUT */
>> + AT91_PIOB 25 AT91_PERIPH_D AT91_PINCTRL_NONE>; /* I2SMCK */
>> + };
>> + };
>> +
>> + leds {
>> + pinctrl_led_gpio_default: led-gpio-default {
>> + atmel,pins = <AT91_PIOC 19 AT91_PERIPH_GPIO AT91_PINCTRL_NONE
>> + AT91_PIOC 21 AT91_PERIPH_GPIO AT91_PINCTRL_NONE
>> + AT91_PIOC 20 AT91_PERIPH_GPIO AT91_PINCTRL_NONE>;
>> + };
>> + };
>> +
>> + sdmmc0 {
>> + pinctrl_sdmmc0_default: sdmmc0 {
>> + atmel,pins =
>> + <AT91_PIOA 2 AT91_PERIPH_A (AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS) /* PA2 CK periph A with pullup */
>> + AT91_PIOA 1 AT91_PERIPH_A (AT91_PINCTRL_PULL_UP | AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS) /* PA1 CMD periph A with pullup */
>> + AT91_PIOA 0 AT91_PERIPH_A (AT91_PINCTRL_PULL_UP | AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS) /* PA0 DAT0 periph A */
>> + AT91_PIOA 3 AT91_PERIPH_A (AT91_PINCTRL_PULL_UP | AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS) /* PA3 DAT1 periph A with pullup */
>> + AT91_PIOA 4 AT91_PERIPH_A (AT91_PINCTRL_PULL_UP | AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS) /* PA4 DAT2 periph A with pullup */
>> + AT91_PIOA 5 AT91_PERIPH_A (AT91_PINCTRL_PULL_UP | AT91_PINCTRL_DRIVE_STRENGTH_HI | AT91_PINCTRL_SLEWRATE_DIS)>; /* PA5 DAT3 periph A with pullup */
>> + };
>> + };
>> +
>
> You can remove this line
>
>> +}; /* pinctrl */
>> +
>> +&rtt {
>> + atmel,rtt-rtc-time-reg = <&gpbr 0x0>;
>> +};
>> +
>> +&sdmmc0 {
>> + bus-width = <4>;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_sdmmc0_default>;
>> + cd-gpios = <&pioA 23 GPIO_ACTIVE_LOW>;
>> + disable-wp;
>> + status = "okay";
>> +};
>> +
>> +&slow_xtal {
>> + clock-frequency = <32768>;
>> +};
>> +
>> +&power_management {
>> + debounce-delay-us = <976>;
>> + status = "okay";
>> +
>> + input@0 {
>> + reg = <0>;
>> + };
>> +};
>> +
>> +&trng {
>> + status = "okay";
>> +};
>> +
>> +&watchdog {
>> + status = "okay";
>> +};
--
Thanks and Regards,
Varshini Rajendran.
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