ARM: dts: add Raspberry Pi 3 A+

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>
Acked-by: Eric Anholt <eric@anholt.net>

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index bd40148..d98d51d 100644 (file)
--- 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 (file)
index 0000000..e9fadd3
--- /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>;
+               };
+       };
+};
+
+&firmware {
+       expgpio: gpio {
+               compatible = "raspberrypi,firmware-gpio";
+               gpio-controller;
+               #gpio-cells = <2>;
+               gpio-line-names = "",
+                                 "BT_WL_ON",
+                                 "STATUS_LED_R",
+                                 "",
+                                 "",
+                                 "CAM_GPIO0",
+                                 "CAM_GPIO1",
+                                 "";
+               status = "okay";
+       };
+};
+
+&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_G",
+                         /* 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",
+                         "", /* 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";
+};
+
+&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";
+};