mvebu: fix the Turris Omnia device tree

Enable and fix hardware buffer management. Also fix the IRQ storm caused by a
misconfiguration of the PCA9538 interrupt pin.

Reviewed-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Tested-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>

3 files changed, 165 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.10/002-v5.11-ARM-dts-turris-omnia-enable-HW-buffer-management.patch b/target/linux/mvebu/patches-5.10/002-v5.11-ARM-dts-turris-omnia-enable-HW-buffer-management.patch
new file mode 100644
index 0000000000..7a4b511998
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/002-v5.11-ARM-dts-turris-omnia-enable-HW-buffer-management.patch
@@ -0,0 +1,74 @@
+From 018b88eee1a2efda26ed2f09aab33ccdc40ef18f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Sun, 15 Nov 2020 14:59:17 +0100
+Subject: ARM: dts: turris-omnia: enable HW buffer management
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The buffer manager is available on Turris Omnia but needs to be
+described in device-tree to be used.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+Fixes: 26ca8b52d6e1 ("ARM: dts: add support for Turris Omnia")
+Cc: linux-arm-kernel@lists.infradead.org
+Cc: Uwe Kleine-König <uwe@kleine-koenig.org>
+Cc: Jason Cooper <jason@lakedaemon.net>
+Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
+Cc: Andreas Färber <afaerber@suse.de>
+Cc: Andrew Lunn <andrew@lunn.ch>
+Cc: Rob Herring <robh+dt@kernel.org>
+Cc: devicetree@vger.kernel.org
+Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
+---
+ arch/arm/boot/dts/armada-385-turris-omnia.dts | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+(limited to 'arch/arm/boot/dts/armada-385-turris-omnia.dts')
+
+--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
++++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
+@@ -84,12 +84,23 @@
+ 	};
+ };
+ 
++&bm {
++	status = "okay";
++};
++
++&bm_bppi {
++	status = "okay";
++};
++
+ /* Connected to 88E6176 switch, port 6 */
+ &eth0 {
+ 	pinctrl-names = "default";
+ 	pinctrl-0 = <&ge0_rgmii_pins>;
+ 	status = "okay";
+ 	phy-mode = "rgmii";
++	buffer-manager = <&bm>;
++	bm,pool-long = <0>;
++	bm,pool-short = <3>;
+ 
+ 	fixed-link {
+ 		speed = <1000>;
+@@ -103,6 +114,9 @@
+ 	pinctrl-0 = <&ge1_rgmii_pins>;
+ 	status = "okay";
+ 	phy-mode = "rgmii";
++	buffer-manager = <&bm>;
++	bm,pool-long = <1>;
++	bm,pool-short = <3>;
+ 
+ 	fixed-link {
+ 		speed = <1000>;
+@@ -115,6 +129,9 @@
+ 	status = "okay";
+ 	phy-mode = "sgmii";
+ 	phy = <&phy1>;
++	buffer-manager = <&bm>;
++	bm,pool-long = <2>;
++	bm,pool-short = <3>;
+ };
+ 
+ &i2c0 {
diff --git a/target/linux/mvebu/patches-5.10/100-ARM-dts-turris-omnia-fix-hardware-buffer-management.patch b/target/linux/mvebu/patches-5.10/100-ARM-dts-turris-omnia-fix-hardware-buffer-management.patch
new file mode 100644
index 0000000000..2ebdc06f61
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/100-ARM-dts-turris-omnia-fix-hardware-buffer-management.patch
@@ -0,0 +1,27 @@
+From 9704292ed3230ee19dc4dd64f7484301b728ffb7 Mon Sep 17 00:00:00 2001
+From: Rui Salvaterra <rsalvaterra@gmail.com>
+Date: Wed, 17 Feb 2021 15:19:30 +0000
+Subject: [PATCH] ARM: dts: turris-omnia: fix hardware buffer management
+
+Hardware buffer management has never worked on the Turris Omnia, as the
+required MBus window hadn't been reserved. Fix thusly.
+
+Fixes: 018b88eee1a2 ("ARM: dts: turris-omnia: enable HW buffer management")
+
+Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
+---
+ arch/arm/boot/dts/armada-385-turris-omnia.dts | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
++++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
+@@ -32,7 +32,8 @@
+ 		ranges = <MBUS_ID(0xf0, 0x01) 0 0xf1000000 0x100000
+ 			  MBUS_ID(0x01, 0x1d) 0 0xfff00000 0x100000
+ 			  MBUS_ID(0x09, 0x19) 0 0xf1100000 0x10000
+-			  MBUS_ID(0x09, 0x15) 0 0xf1110000 0x10000>;
++			  MBUS_ID(0x09, 0x15) 0 0xf1110000 0x10000
++			  MBUS_ID(0x0c, 0x04) 0 0xf1200000 0x100000>;
+ 
+ 		internal-regs {
+ 
diff --git a/target/linux/mvebu/patches-5.10/101-ARM-dts-turris-omnia-configure-LED-2--INTn-pin-as-interrupt-pin.patch b/target/linux/mvebu/patches-5.10/101-ARM-dts-turris-omnia-configure-LED-2--INTn-pin-as-interrupt-pin.patch
new file mode 100644
index 0000000000..c7509950e0
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/101-ARM-dts-turris-omnia-configure-LED-2--INTn-pin-as-interrupt-pin.patch
@@ -0,0 +1,64 @@
+From: "Marek Behún" <kabel@kernel.org>
+To: Gregory CLEMENT <gregory.clement@bootlin.com>
+Cc: "Marek Behún" <kabel@kernel.org>, Rui Salvaterra <rsalvaterra@gmail.com>, "Uwe Kleine-König" <uwe@kleine-koenig.org>, linux-arm-kernel@lists.infradead.org, Andrew Lunn <andrew@lunn.ch>, stable@vger.kernel.org
+Subject: [PATCH mvebu-dt] ARM: dts: turris-omnia: configure LED[2]/INTn pin as interrupt pin
+Date: Sun, 21 Feb 2021 00:11:44 +0100
+Message-Id: <20210220231144.32325-1-kabel@kernel.org>
+X-Mailer: git-send-email 2.26.2
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Use the `marvell,reg-init` DT property to configure the LED[2]/INTn pin
+of the Marvell 88E1514 ethernet PHY on Turris Omnia into interrupt mode.
+
+Without this the pin is by default in LED[2] mode, and the Marvell PHY
+driver configures LED[2] into "On - Link, Blink - Activity" mode.
+
+This fixes the issue where the pca9538 GPIO/interrupt controller (which
+can't mask interrupts in HW) received too many interrupts and after a
+time started ignoring the interrupt with error message:
+  IRQ 71: nobody cared
+
+There is a work in progress to have the Marvell PHY driver support
+parsing PHY LED nodes from OF and registering the LEDs as Linux LED
+class devices. Once this is done the PHY driver can also automatically
+set the pin into INTn mode if it does not find LED[2] in OF.
+
+Until then, though, we fix this via `marvell,reg-init` DT property.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+Reported-by: Rui Salvaterra <rsalvaterra@gmail.com>
+Fixes: 26ca8b52d6e1 ("ARM: dts: add support for Turris Omnia")
+Cc: Uwe Kleine-König <uwe@kleine-koenig.org>
+Cc: linux-arm-kernel@lists.infradead.org
+Cc: Andrew Lunn <andrew@lunn.ch>
+Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
+Cc: <stable@vger.kernel.org>
+
+---
+
+This patch fixes bug introduced with the commit that added Turris
+Omnia's DTS (26ca8b52d6e1), but will not apply cleanly because there is
+commit 8ee4a5f4f40d which changed node name and node compatible
+property and this commit did not go into stable.
+
+So either commit 8ee4a5f4f40d has also to go into stable before this, or
+this patch has to be fixed a little in order to apply to 4.14+.
+
+Please let me know how should I handle this.
+
+---
+ arch/arm/boot/dts/armada-385-turris-omnia.dts | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
++++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
+@@ -390,6 +390,7 @@
+ 	phy1: ethernet-phy@1 {
+ 		compatible = "ethernet-phy-ieee802.3-c22";
+ 		reg = <1>;
++		marvell,reg-init = <3 18 0 0x4985>;
+ 
+ 		/* irq is connected to &pcawan pin 7 */
+ 	};