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Subject[PATCH AUTOSEL for 4.9 161/293] MIPS: SEAD-3: Set interrupt-parent per-device, not at root node
Date
From: Paul Burton <paul.burton@imgtec.com>

[ Upstream commit fbdc674ba33c3791b315a546019e570e3e94e599 ]

The SEAD-3 board may be configured with or without a MIPS Global
Interrupt Controller (GIC). Because of this we have a device tree with a
default case of a GIC present, and code to fixup the device tree based
upon a configuration register that indicates the presence of the GIC.

In order to keep this DT fixup code simple, the interrupt-parent
property was specified at the root node of the SEAD-3 DT, allowing the
fixup code to simply change this property to the phandle of the CPU
interrupt controller if a GIC is not present & affect all
interrupt-using devices at once. This however causes a problem if we do
have a GIC & the device tree is used as-is, because the interrupt-parent
property of the root node applies to the CPU interrupt controller node.
This causes a cycle when of_irq_init() attempts to probe interrupt
controllers in order and boots fail due to a lack of configured
interrupts, with this message printed on the kernel console:

[ 0.000000] OF: of_irq_init: children remain, but no parents

Fix this by removing the interrupt-parent property from the DT root node
& instead setting it for each device which uses interrupts, ensuring
that the CPU interrupt controller node has no interrupt-parent &
allowing of_irq_init() to identify it as the root interrupt controller.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reported-by: Keng Koh <keng.koh@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16187/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
arch/mips/boot/dts/mti/sead3.dts | 5 ++++-
arch/mips/generic/board-sead3.c | 26 ++++++++++++++++++++------
2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/arch/mips/boot/dts/mti/sead3.dts b/arch/mips/boot/dts/mti/sead3.dts
index b112879a5d9d..60bc5f080454 100644
--- a/arch/mips/boot/dts/mti/sead3.dts
+++ b/arch/mips/boot/dts/mti/sead3.dts
@@ -11,7 +11,6 @@
#size-cells = <1>;
compatible = "mti,sead-3";
model = "MIPS SEAD-3";
- interrupt-parent = <&gic>;

chosen {
stdout-path = "uart1:115200";
@@ -65,6 +64,7 @@
compatible = "generic-ehci";
reg = <0x1b200000 0x1000>;

+ interrupt-parent = <&gic>;
interrupts = <0>; /* GIC 0 or CPU 6 */

has-transaction-translator;
@@ -227,6 +227,7 @@

clock-frequency = <14745600>;

+ interrupt-parent = <&gic>;
interrupts = <3>; /* GIC 3 or CPU 4 */

no-loopback-test;
@@ -241,6 +242,7 @@

clock-frequency = <14745600>;

+ interrupt-parent = <&gic>;
interrupts = <2>; /* GIC 2 or CPU 4 */

no-loopback-test;
@@ -251,6 +253,7 @@
reg = <0x1f010000 0x10000>;
reg-io-width = <4>;

+ interrupt-parent = <&gic>;
interrupts = <0>; /* GIC 0 or CPU 6 */

phy-mode = "mii";
diff --git a/arch/mips/generic/board-sead3.c b/arch/mips/generic/board-sead3.c
index f4ae0584a33b..5e2f260ce16a 100644
--- a/arch/mips/generic/board-sead3.c
+++ b/arch/mips/generic/board-sead3.c
@@ -163,14 +163,16 @@ static __init int remove_gic(void *fdt)
return -EINVAL;
}

- err = fdt_setprop_u32(fdt, 0, "interrupt-parent", cpu_phandle);
- if (err) {
- pr_err("unable to set root interrupt-parent: %d\n", err);
- return err;
- }
-
uart_off = fdt_node_offset_by_compatible(fdt, -1, "ns16550a");
while (uart_off >= 0) {
+ err = fdt_setprop_u32(fdt, uart_off, "interrupt-parent",
+ cpu_phandle);
+ if (err) {
+ pr_warn("unable to set UART interrupt-parent: %d\n",
+ err);
+ return err;
+ }
+
err = fdt_setprop_u32(fdt, uart_off, "interrupts",
cpu_uart_int);
if (err) {
@@ -193,6 +195,12 @@ static __init int remove_gic(void *fdt)
return eth_off;
}

+ err = fdt_setprop_u32(fdt, eth_off, "interrupt-parent", cpu_phandle);
+ if (err) {
+ pr_err("unable to set ethernet interrupt-parent: %d\n", err);
+ return err;
+ }
+
err = fdt_setprop_u32(fdt, eth_off, "interrupts", cpu_eth_int);
if (err) {
pr_err("unable to set ethernet interrupts property: %d\n", err);
@@ -205,6 +213,12 @@ static __init int remove_gic(void *fdt)
return ehci_off;
}

+ err = fdt_setprop_u32(fdt, ehci_off, "interrupt-parent", cpu_phandle);
+ if (err) {
+ pr_err("unable to set EHCI interrupt-parent: %d\n", err);
+ return err;
+ }
+
err = fdt_setprop_u32(fdt, ehci_off, "interrupts", cpu_ehci_int);
if (err) {
pr_err("unable to set EHCI interrupts property: %d\n", err);
--
2.15.1
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