diff mbox series

[v3,2/6] dt-bindings: ipmi: bt-bmc: add 'clocks' as a required property

Message ID 20211108190200.290957-3-jae.hyun.yoo@intel.com (mailing list archive)
State New, archived
Headers show
Series Add LCLK control into Aspeed LPC sub drivers | expand

Commit Message

jae.hyun.yoo@intel.com Nov. 8, 2021, 7:01 p.m. UTC
From: Jae Hyun Yoo <jae.hyun.yoo@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 as one of
required properties to enable the LCLK by the LPC IBT driver.

Note: dtsi change in this patch series should be applied along with,
and dtbs should be re-compiled after applying this series 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@linux.intel.com>
---
v2 -> v3:
 * Made commit message more descriptive.

v1 -> v2:
 * Added 'clocks' property into ibt bindings using
   'aspeed,ast2400-ibt-bmc.txt' because it's not merged into
   'aspeed-lpc.yaml' yet. The bindings merging could be done using a
   separate patch later.

 .../devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt         | 2 ++
 1 file changed, 2 insertions(+)

Comments

Rob Herring Nov. 19, 2021, 1:07 a.m. UTC | #1
On Mon, 08 Nov 2021 11:01:56 -0800, jae.hyun.yoo@intel.com wrote:
> From: Jae Hyun Yoo <jae.hyun.yoo@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 as one of
> required properties to enable the LCLK by the LPC IBT driver.
> 
> Note: dtsi change in this patch series should be applied along with,
> and dtbs should be re-compiled after applying this series 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@linux.intel.com>
> ---
> v2 -> v3:
>  * Made commit message more descriptive.
> 
> v1 -> v2:
>  * Added 'clocks' property into ibt bindings using
>    'aspeed,ast2400-ibt-bmc.txt' because it's not merged into
>    'aspeed-lpc.yaml' yet. The bindings merging could be done using a
>    separate patch later.
> 
>  .../devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt         | 2 ++
>  1 file changed, 2 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt
index c9902fd4b38b..25f86da804b7 100644
--- a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt
+++ b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt
@@ -11,6 +11,7 @@  Required properties:
 	"aspeed,ast2500-ibt-bmc"
 	"aspeed,ast2600-ibt-bmc"
 - reg: physical address and size of the registers
+- clocks: clock for the device
 
 Optional properties:
 
@@ -23,4 +24,5 @@  Example:
 		compatible = "aspeed,ast2400-ibt-bmc";
 		reg = <0x1e789140 0x18>;
 		interrupts = <8>;
+		clocks = <&syscon ASPEED_CLK_GATE_LCLK>;
 	};