linux-kernel - [PATCH v5 2/5] ARM: dts: NSP: Add Ax stepping modifications

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Date:   Fri,  6 Aug 2021 21:44:33 +0100
From:   Matthew Hagan <mnhagan88@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Matthew Hagan <mnhagan88@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 2/5] ARM: dts: NSP: Add Ax stepping modifications

While uncommon, some Ax NSP SoCs exist in the wild. This stepping
requires a modified secondary CPU boot-reg and removal of DMA coherency
properties. Without these modifications, the secondary CPU will be
inactive and many peripherals will exhibit undefined behaviour.

Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
---
 arch/arm/boot/dts/bcm-nsp-ax.dtsi | 70 +++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 arch/arm/boot/dts/bcm-nsp-ax.dtsi

diff --git a/arch/arm/boot/dts/bcm-nsp-ax.dtsi b/arch/arm/boot/dts/bcm-nsp-ax.dtsi
new file mode 100644
index 000000000000..a21e275935ce
--- /dev/null
+++ b/arch/arm/boot/dts/bcm-nsp-ax.dtsi
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Broadcom Northstar Plus Ax stepping-specific bindings.
+ * Notable differences from B0+ are the secondary-boot-reg and
+ * lack of DMA coherency.
+ */
+
+&cpu1 {
+	secondary-boot-reg = <0xffff042c>;
+};
+
+&dma {
+	/delete-property/ dma-coherent;
+};
+
+&sdio {
+	/delete-property/ dma-coherent;
+};
+
+&amac0 {
+	/delete-property/ dma-coherent;
+};
+
+&amac1 {
+	/delete-property/ dma-coherent;
+};
+
+&amac2 {
+	/delete-property/ dma-coherent;
+};
+
+&ehci0 {
+	/delete-property/ dma-coherent;
+};
+
+&mailbox {
+	/delete-property/ dma-coherent;
+};
+
+&xhci {
+	/delete-property/ dma-coherent;
+};
+
+&ehci0 {
+	/delete-property/ dma-coherent;
+};
+
+&ohci0 {
+	/delete-property/ dma-coherent;
+};
+
+&i2c0 {
+	/delete-property/ dma-coherent;
+};
+
+&sata {
+	/delete-property/ dma-coherent;
+};
+
+&pcie0 {
+	/delete-property/ dma-coherent;
+};
+
+&pcie1 {
+	/delete-property/ dma-coherent;
+};
+
+&pcie2 {
+	/delete-property/ dma-coherent;
+};
-- 
2.26.3