[PATCH v3 1/6] ARM: dts: aspeed: add LCLK setting into LPC IBT node

[jae.hyun.yoo at intel.com]

From: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>

If LPC BT driver is registered ahead of lpc-ctrl module, LPC BT
hardware block will be enabled without heart beating of LCLK until
lpc-ctrl enables the LCLK. This issue causes improper handling on
host interrupts when the host sends interrupts in that time frame.
Then kernel eventually forcibly disables the interrupt with
dumping stack and printing a 'nobody cared this irq' message out.

To prevent this issue, all LPC sub drivers should enable LCLK
individually so this patch adds 'clocks' property setting into LPC
IBT node as one of required properties to enable the LCLK by the
LPC IBT driver.

Note: dtbs should be re-compiled after applying this change since
it's adding a new required property otherwise the driver will not
be probed correctly.

Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
Reviewed-by: Joel Stanley <joel at jms.id.au>
Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
---
v2 -> v3:
 * Made commit message more descriptive.

v1 -> v2:
 * No change.

 arch/arm/boot/dts/aspeed-g4.dtsi | 1 +
 arch/arm/boot/dts/aspeed-g5.dtsi | 1 +
 arch/arm/boot/dts/aspeed-g6.dtsi | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed-g4.dtsi
index b313a1cf5f73..f14dace34c5a 100644
--- a/arch/arm/boot/dts/aspeed-g4.dtsi
+++ b/arch/arm/boot/dts/aspeed-g4.dtsi
@@ -381,6 +381,7 @@ ibt: ibt at 140 {
 					compatible = "aspeed,ast2400-ibt-bmc";
 					reg = <0x140 0x18>;
 					interrupts = <8>;
+					clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
 					status = "disabled";
 				};
 
diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
index c7049454c7cb..d0cc4be2de59 100644
--- a/arch/arm/boot/dts/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed-g5.dtsi
@@ -507,6 +507,7 @@ ibt: ibt at 140 {
 					compatible = "aspeed,ast2500-ibt-bmc";
 					reg = <0x140 0x18>;
 					interrupts = <8>;
+					clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
 					status = "disabled";
 				};
 			};
diff --git a/arch/arm/boot/dts/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed-g6.dtsi
index 5106a424f1ce..465c3549fdc3 100644
--- a/arch/arm/boot/dts/aspeed-g6.dtsi
+++ b/arch/arm/boot/dts/aspeed-g6.dtsi
@@ -581,6 +581,7 @@ ibt: ibt at 140 {
 					compatible = "aspeed,ast2600-ibt-bmc";
 					reg = <0x140 0x18>;
 					interrupts = <GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>;
+					clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
 					status = "disabled";
 				};
 			};
-- 
2.25.1