Re: [PATCH V4 2/3] ARM: dts: add Raspberry Pi 3 A+

[Sergey Suloev <ssuloev@orpaltech.com>]

Hi, Stefan,

is this patch the only update required to run Rpi3 A+ with kernel 4.20?

Thank you,
Sergey


On 12/26/18 2:20 AM, Stefan Wahren wrote:
> The Raspberry Pi 3 A+ is similar to the Pi 3 B+ but has only 512 MB RAM,
> 1 USB 2.0 port and no Ethernet.
>
> Compared to the Raspberry Pi 3 B it isn't possible to control BT_ON and
> WL_ON separately.
>
> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
> ---
>   arch/arm/boot/dts/Makefile                 |   1 +
>   arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts | 175 +++++++++++++++++++++++++++++
>   2 files changed, 176 insertions(+)
>   create mode 100644 arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 78551c4..764fe91 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -79,6 +79,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += \
>   	bcm2835-rpi-a-plus.dtb \
>   	bcm2835-rpi-cm1-io1.dtb \
>   	bcm2836-rpi-2-b.dtb \
> +	bcm2837-rpi-3-a-plus.dtb \
>   	bcm2837-rpi-3-b.dtb \
>   	bcm2837-rpi-3-b-plus.dtb \
>   	bcm2837-rpi-cm3-io3.dtb \
> diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts b/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
> new file mode 100644
> index 0000000..61f4e4d
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
> @@ -0,0 +1,175 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/dts-v1/;
> +#include "bcm2837.dtsi"
> +#include "bcm2836-rpi.dtsi"
> +#include "bcm283x-rpi-usb-host.dtsi"
> +
> +/ {
> +	compatible = "raspberrypi,3-model-a-plus", "brcm,bcm2837";
> +	model = "Raspberry Pi 3 Model A+";
> +
> +	chosen {
> +		/* 8250 auxiliary UART instead of pl011 */
> +		stdout-path = "serial1:115200n8";
> +	};
> +
> +	memory {
> +		reg = <0 0x20000000>;
> +	};
> +
> +	leds {
> +		act {
> +			gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
> +		};
> +
> +		pwr {
> +			label = "PWR";
> +			gpios = <&expgpio 2 GPIO_ACTIVE_LOW>;
> +		};
> +	};
> +};
> +
> +&gpio {
> +	/*
> +	 * This is mostly based on the official GPU firmware DT blob.
> +	 *
> +	 * Legend:
> +	 * "NC" = not connected (no rail from the SoC)
> +	 * "FOO" = GPIO line named "FOO" on the schematic
> +	 * "FOO_N" = GPIO line named "FOO" on schematic, active low
> +	 */
> +	gpio-line-names = "ID_SDA",
> +			  "ID_SCL",
> +			  "SDA1",
> +			  "SCL1",
> +			  "GPIO_GCLK",
> +			  "GPIO5",
> +			  "GPIO6",
> +			  "SPI_CE1_N",
> +			  "SPI_CE0_N",
> +			  "SPI_MISO",
> +			  "SPI_MOSI",
> +			  "SPI_SCLK",
> +			  "GPIO12",
> +			  "GPIO13",
> +			  /* Serial port */
> +			  "TXD1",
> +			  "RXD1",
> +			  "GPIO16",
> +			  "GPIO17",
> +			  "GPIO18",
> +			  "GPIO19",
> +			  "GPIO20",
> +			  "GPIO21",
> +			  "GPIO22",
> +			  "GPIO23",
> +			  "GPIO24",
> +			  "GPIO25",
> +			  "GPIO26",
> +			  "GPIO27",
> +			  "HDMI_HPD_N",
> +			  "STATUS_LED",
> +			  /* Used by BT module */
> +			  "CTS0",
> +			  "RTS0",
> +			  "TXD0",
> +			  "RXD0",
> +			  /* Used by Wifi */
> +			  "SD1_CLK",
> +			  "SD1_CMD",
> +			  "SD1_DATA0",
> +			  "SD1_DATA1",
> +			  "SD1_DATA2",
> +			  "SD1_DATA3",
> +			  "PWM0_OUT",
> +			  "PWM1_OUT",
> +			  "NC", /* GPIO42 */
> +			  "WIFI_CLK",
> +			  "SDA0",
> +			  "SCL0",
> +			  "SMPS_SCL",
> +			  "SMPS_SDA",
> +			  /* Used by SD Card */
> +			  "SD_CLK_R",
> +			  "SD_CMD_R",
> +			  "SD_DATA0_R",
> +			  "SD_DATA1_R",
> +			  "SD_DATA2_R",
> +			  "SD_DATA3_R";
> +};
> +
> +&firmware {
> +	expgpio: gpio {
> +		compatible = "raspberrypi,firmware-gpio";
> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		gpio-line-names = "",
> +				  "BT_WL_ON",
> +				  "STATUS_LED",
> +				  "",
> +				  "",
> +				  "CAM_GPIO0",
> +				  "CAM_GPIO1",
> +				  "";
> +		status = "okay";
> +	};
> +};
> +
> +&hdmi {
> +	hpd-gpios = <&gpio 28 GPIO_ACTIVE_LOW>;
> +};
> +
> +&pwm {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pwm0_gpio40 &pwm1_gpio41>;
> +	status = "okay";
> +};
> +
> +/*
> + * SDHCI is used to control the SDIO for wireless
> + *
> + * WL_REG_ON and BT_REG_ON of the CYW43455 Wifi/BT module are driven
> + * by a single GPIO. We can't give GPIO control to one of the drivers,
> + * otherwise the other part would get unexpectedly disturbed.
> + */
> +&sdhci {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&emmc_gpio34>;
> +	status = "okay";
> +	bus-width = <4>;
> +	non-removable;
> +
> +	brcmf: wifi@1 {
> +		reg = <1>;
> +		compatible = "brcm,bcm4329-fmac";
> +	};
> +};
> +
> +/* SDHOST is used to drive the SD card */
> +&sdhost {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&sdhost_gpio48>;
> +	status = "okay";
> +	bus-width = <4>;
> +};
> +
> +/* uart0 communicates with the BT module */
> +&uart0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_ctsrts_gpio30 &uart0_gpio32 &gpclk2_gpio43>;
> +	status = "okay";
> +
> +	bluetooth {
> +		compatible = "brcm,bcm43438-bt";
> +		max-speed = <2000000>;
> +	};
> +};
> +
> +/* uart1 is mapped to the pin header */
> +&uart1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart1_gpio14>;
> +	status = "okay";
> +};

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