[PATCH V2 0/3] ARM: bcm283x: Raspberry Pi Zero W support

[PATCH V2 0/3] ARM: bcm283x: Raspberry Pi Zero W support

[Stefan Wahren]

This patch series adds support for the Raspberry Pi Zero W. It depends
on "V2 ARM: dts: bcm283x: Move the BCM2837 DT contents from arm64 to arm."

Currently there is a regression [1] in the brcmfmac driver. This hack [2]
avoids the issue and make wifi probe on RPi Zero W.

Changes in V2:
- add aliases comment and gpio-line-names into bcm2835-rpi-zero-w.dts
- rebased on V2 of arm64 to arm patch

[1] - http://marc.info/?l=linux-wireless&m=150029709021719&w=2
[2] - https://github.com/lategoodbye/rpi-zero/commit/95ef5b8fbc05d9ec086970648767cafa10483622

Stefan Wahren (3):
  ARM: bcm283x: Define UART pinmuxing on board level
  dt-bindings: bcm: Add Raspberry Pi Zero W
  ARM: dts: bcm2835: Add Raspberry Pi Zero W

 .../devicetree/bindings/arm/bcm/brcm,bcm2835.txt   |   4 +
 arch/arm/boot/dts/Makefile                         |   3 +-
 arch/arm/boot/dts/bcm2835-rpi-a-plus.dts           |   6 +
 arch/arm/boot/dts/bcm2835-rpi-a.dts                |   6 +
 arch/arm/boot/dts/bcm2835-rpi-b-plus.dts           |   6 +
 arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts           |   6 +
 arch/arm/boot/dts/bcm2835-rpi-b.dts                |   6 +
 arch/arm/boot/dts/bcm2835-rpi-zero-w.dts           | 139 +++++++++++++++++++++
 arch/arm/boot/dts/bcm2835-rpi-zero.dts             |   6 +
 arch/arm/boot/dts/bcm2835-rpi.dtsi                 |   2 +-
 arch/arm/boot/dts/bcm2836-rpi-2-b.dts              |   6 +
 arch/arm/boot/dts/bcm2837-rpi-3-b.dts              |  10 ++
 12 files changed, 198 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm/boot/dts/bcm2835-rpi-zero-w.dts

-- 
2.7.4

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[PATCH V2 1/3] ARM: bcm283x: Define UART pinmuxing on board level

[Stefan Wahren]

Until RPI 3 and Zero W the pl011 (uart0) was always on pin 14/15. So in
order to take care of them and other boards in the future,
we need to define UART pinmuxing on board level.

This work based on Eric Anholt's patch "ARM: bcm2385: Don't force pl011
onto pins 14/15." and Fabian Vogt's patch "ARM64: dts: bcm2837: assign
uart0 to BT and uart1 to pin headers".

Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
---
 arch/arm/boot/dts/bcm2835-rpi-a-plus.dts |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi-a.dts      |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi-b-plus.dts |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi-b.dts      |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi-zero.dts   |  6 ++++++
 arch/arm/boot/dts/bcm2835-rpi.dtsi       |  2 +-
 arch/arm/boot/dts/bcm2836-rpi-2-b.dts    |  6 ++++++
 arch/arm/boot/dts/bcm2837-rpi-3-b.dts    | 10 ++++++++++
 9 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/bcm2835-rpi-a-plus.dts b/arch/arm/boot/dts/bcm2835-rpi-a-plus.dts
index d070454..9f86649 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-a-plus.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-a-plus.dts
@@ -99,3 +99,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-a.dts b/arch/arm/boot/dts/bcm2835-rpi-a.dts
index 46d078e..4b1af06 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-a.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-a.dts
@@ -94,3 +94,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts b/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
index 432088e..a846f1e 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
@@ -101,3 +101,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
index 4133bc2..e860964 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
@@ -94,3 +94,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index 4d56fe3..5d77f3f 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts
@@ -89,3 +89,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-zero.dts b/arch/arm/boot/dts/bcm2835-rpi-zero.dts
index 79a20d5..7036240 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-zero.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-zero.dts
@@ -103,3 +103,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index e55b362..e36c392 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -39,7 +39,7 @@
 	};
 
 	alt0: alt0 {
-		brcm,pins = <4 5 7 8 9 10 11 14 15>;
+		brcm,pins = <4 5 7 8 9 10 11>;
 		brcm,function = <BCM2835_FSEL_ALT0>;
 	};
 };
diff --git a/arch/arm/boot/dts/bcm2836-rpi-2-b.dts b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
index bf19e8c..e8de414 100644
--- a/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
+++ b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
@@ -39,3 +39,9 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
index 972f14d..20725ca 100644
--- a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
+++ b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
@@ -19,7 +19,17 @@
 	};
 };
 
+/* uart0 communicates with the BT module */
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio32 &gpclk2_gpio43>;
+	status = "okay";
+};
+
+/* uart1 is mapped to the pin header */
 &uart1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart1_gpio14>;
 	status = "okay";
 };
 
-- 
2.7.4

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[PATCH V2 2/3] dt-bindings: bcm: Add Raspberry Pi Zero W

[Stefan Wahren]

This adds the root properties for the Raspberry Pi Zero W.

Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
Reviewed-by: Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt
index 9c97de2..3e3efa0 100644
--- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt
@@ -42,6 +42,10 @@ Raspberry Pi Zero
 Required root node properties:
 compatible = "raspberrypi,model-zero", "brcm,bcm2835";
 
+Raspberry Pi Zero W
+Required root node properties:
+compatible = "raspberrypi,model-zero-w", "brcm,bcm2835";
+
 Generic BCM2835 board
 Required root node properties:
 compatible = "brcm,bcm2835";
-- 
2.7.4

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[PATCH V2 3/3] ARM: dts: bcm2835: Add Raspberry Pi Zero W

[Stefan Wahren]

The Raspberry Pi Zero W has the same components like the Zero plus
a Cypress CYW43438 wireless chip (wifi + bl).

Signed-off-by: Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
---
 arch/arm/boot/dts/Makefile               |   3 +-
 arch/arm/boot/dts/bcm2835-rpi-zero-w.dts | 139 +++++++++++++++++++++++++++++++
 2 files changed, 141 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boot/dts/bcm2835-rpi-zero-w.dts

I'm not sure that GPIO34 to GPIO39 are really "not connected".
They are listed in dt-blob.dts, but only declared as input.
Still no full schematics available.

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 4b17f35..6e632a3 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -73,7 +73,8 @@ dtb-$(CONFIG_ARCH_BCM2835) += \
 	bcm2835-rpi-a-plus.dtb \
 	bcm2836-rpi-2-b.dtb \
 	bcm2837-rpi-3-b.dtb \
-	bcm2835-rpi-zero.dtb
+	bcm2835-rpi-zero.dtb \
+	bcm2835-rpi-zero-w.dtb
 dtb-$(CONFIG_ARCH_BCM_5301X) += \
 	bcm4708-asus-rt-ac56u.dtb \
 	bcm4708-asus-rt-ac68u.dtb \
diff --git a/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts b/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
new file mode 100644
index 0000000..82651c3
--- /dev/null
+++ b/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2017 Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/dts-v1/;
+#include "bcm2835.dtsi"
+#include "bcm2835-rpi.dtsi"
+#include "bcm283x-rpi-usb-host.dtsi"
+
+/ {
+	compatible = "raspberrypi,model-zero-w", "brcm,bcm2835";
+	model = "Raspberry Pi Zero W";
+
+	/* Needed by firmware to properly init UARTs */
+	aliases {
+		uart0 = "/soc/serial@7e201000";
+		uart1 = "/soc/serial@7e215040";
+		serial0 = "/soc/serial@7e201000";
+		serial1 = "/soc/serial@7e215040";
+	};
+
+	leds {
+		act {
+			gpios = <&gpio 47 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wl_on>;
+		reset-gpios = <&gpio 41 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&gpio {
+	/*
+	 * This is 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 = "GPIO0",
+			  "GPIO1",
+			  "SDA1",
+			  "SCL1",
+			  "GPIO_GCLK",
+			  "GPIO5",
+			  "GPIO6",
+			  "SPI_CE1_N",
+			  "SPI_CE0_N",
+			  "SPI_MISO",
+			  "SPI_MOSI",
+			  "SPI_SCLK",
+			  "GPIO12",
+			  "GPIO13",
+			  /* Serial port */
+			  "TXD0",
+			  "RXD0",
+			  "GPIO16",
+			  "GPIO17",
+			  "GPIO18",
+			  "GPIO19",
+			  "GPIO20",
+			  "GPIO21",
+			  "GPIO22",
+			  "GPIO23",
+			  "GPIO24",
+			  "GPIO25",
+			  "GPIO26",
+			  "GPIO27",
+			  "SDA0",
+			  "SCL0",
+			  "NC", /* GPIO30 */
+			  "NC", /* GPIO31 */
+			  "NC", /* GPIO32 */
+			  "NC", /* GPIO33 */
+			  "NC", /* GPIO34 */
+			  "NC", /* GPIO35 */
+			  "NC", /* GPIO36 */
+			  "NC", /* GPIO37 */
+			  "NC", /* GPIO38 */
+			  "NC", /* GPIO39 */
+			  "CAM_GPIO1", /* GPIO40 */
+			  "WL_ON", /* GPIO41 */
+			  "NC", /* GPIO42 */
+			  "WIFI_CLK", /* GPIO43 */
+			  "CAM_GPIO0", /* GPIO44 */
+			  "BT_ON", /* GPIO45 */
+			  "HDMI_HPD_N",
+			  "STATUS_LED_N",
+			  /* Used by SD Card */
+			  "SD_CLK_R",
+			  "SD_CMD_R",
+			  "SD_DATA0_R",
+			  "SD_DATA1_R",
+			  "SD_DATA2_R",
+			  "SD_DATA3_R";
+
+	pinctrl-0 = <&gpioout &alt0>;
+
+	wl_on: wl-on {
+		brcm,pins = <41>;
+		brcm,function = <BCM2835_FSEL_GPIO_OUT>;
+	};
+};
+
+&hdmi {
+	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
+};
+
+&sdhci {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-0 = <&emmc_gpio34 &gpclk2_gpio43>;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	non-removable;
+	status = "okay";
+
+	brcmf: wifi@1 {
+		reg = <1>;
+		compatible = "brcm,bcm4329-fmac";
+	};
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_gpio14>;
+	status = "okay";
+};
-- 
2.7.4

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Re: [PATCH V2 0/3] ARM: bcm283x: Raspberry Pi Zero W support

[Eric Anholt]

[-- Attachment #1: Type: text/plain, Size: 711 bytes --]

Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org> writes:

> This patch series adds support for the Raspberry Pi Zero W. It depends
> on "V2 ARM: dts: bcm283x: Move the BCM2837 DT contents from arm64 to arm."
>
> Currently there is a regression [1] in the brcmfmac driver. This hack [2]
> avoids the issue and make wifi probe on RPi Zero W.
>
> Changes in V2:
> - add aliases comment and gpio-line-names into bcm2835-rpi-zero-w.dts
> - rebased on V2 of arm64 to arm patch
>
> [1] - http://marc.info/?l=linux-wireless&m=150029709021719&w=2
> [2] - https://github.com/lategoodbye/rpi-zero/commit/95ef5b8fbc05d9ec086970648767cafa10483622

Reviewed and pushed to my dt-next, will try to get a PR out soon.

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