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MIPS: SEAD-3: Set interrupt-parent per-device, not at root node

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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>
This commit is contained in:
Paul Burton 2017-06-02 12:29:57 -07:00 committed by Ralf Baechle
parent 032a469b1e
commit fbdc674ba3
2 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/boot/dts/mti/sead3.dts
View File

@ -11,7 +11,6 @@ / {
#size-cells = <1>;
compatible = "mti,sead-3";
model = "MIPS SEAD-3";
interrupt-parent = <&gic>;
chosen {
stdout-path = "serial1:115200";
@ -60,6 +59,7 @@ ehci@1b200000 {
compatible = "generic-ehci";
reg = <0x1b200000 0x1000>;
interrupt-parent = <&gic>;
interrupts = <0>; /* GIC 0 or CPU 6 */
has-transaction-translator;
@ -222,6 +222,7 @@ uart0: uart@1f000900 {
clock-frequency = <14745600>;
interrupt-parent = <&gic>;
interrupts = <3>; /* GIC 3 or CPU 4 */
no-loopback-test;
@ -236,6 +237,7 @@ uart1: uart@1f000800 {
clock-frequency = <14745600>;
interrupt-parent = <&gic>;
interrupts = <2>; /* GIC 2 or CPU 4 */
no-loopback-test;
@ -246,6 +248,7 @@ eth@1f010000 {
reg = <0x1f010000 0x10000>;
reg-io-width = <4>;
interrupt-parent = <&gic>;
interrupts = <0>; /* GIC 0 or CPU 6 */
phy-mode = "mii";

22
arch/mips/generic/board-sead3.c
View File

@ -87,14 +87,16 @@ static __init int remove_gic(void *fdt)
return -EINVAL;
}
err = fdt_setprop_u32(fdt, 0, "interrupt-parent", cpu_phandle);
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_err("unable to set root interrupt-parent: %d\n", err);
pr_warn("unable to set UART 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, "interrupts",
cpu_uart_int);
if (err) {
@ -117,6 +119,12 @@ 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);
@ -129,6 +137,12 @@ 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);