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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Rob Herring <robh+dt@kernel.org>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v2] ARM: dts: bcm2711: Move emmc2 into its own bus
Date: Wed, 4 Mar 2020 14:24:37 +0100
Message-Id: <20200304132437.20164-1-nsaenzjulienne@suse.de>
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Cc: devicetree@vger.kernel.org, f.fainelli@gmail.com, phil@raspberrypi.org,
linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org
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Depending on bcm2711's revision its emmc2 controller might have
different DMA constraints. Raspberry Pi 4's firmware will take care of
updating those, but only if a certain alias is found in the device tree.
So, move emmc2 into its own bus, so as not to pollute other devices with
dma-ranges changes and create the emmc2bus alias.
Based in Phil ELwell's downstream implementation.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
Changes since v1:
- Add comment in dt
- Fix commit title
arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 1 +
arch/arm/boot/dts/bcm2711.dtsi | 25 ++++++++++++++++++++-----
2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 1d4b589fe233..e26ea9006378 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -20,6 +20,7 @@ memory@0 {
};
aliases {
+ emmc2bus = &emmc2bus;
ethernet0 = &genet;
pcie0 = &pcie0;
};
diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
index d1e684d0acfd..a91cf68e3c4c 100644
--- a/arch/arm/boot/dts/bcm2711.dtsi
+++ b/arch/arm/boot/dts/bcm2711.dtsi
@@ -241,17 +241,32 @@ pwm1: pwm@7e20c800 {
status = "disabled";
};
+ hvs@7e400000 {
+ interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
+ };
+ };
+
+ /*
+ * emmc2 has different DMA constraints based on SoC revisions. It was
+ * moved into its own bus, so as for RPi4's firmware to update them.
+ * The firmware will find whether the emmc2bus alias is defined, and if
+ * so, it'll edit the dma-ranges property below accordingly.
+ */
+ emmc2bus: emmc2bus {
+ compatible = "simple-bus";
+ #address-cells = <2>;
+ #size-cells = <1>;
+
+ ranges = <0x0 0x7e000000 0x0 0xfe000000 0x01800000>;
+ dma-ranges = <0x0 0xc0000000 0x0 0x00000000 0x40000000>;
+
emmc2: emmc2@7e340000 {
compatible = "brcm,bcm2711-emmc2";
- reg = <0x7e340000 0x100>;
+ reg = <0x0 0x7e340000 0x100>;
interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clocks BCM2711_CLOCK_EMMC2>;
status = "disabled";
};
-
- hvs@7e400000 {
- interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
- };
};
arm-pmu {