Re: [PATCH v3 5/6] dt-bindings: ipmi: aspeed,kcs-bmc: add 'clocks' as a required property

[Rob Herring <robh@kernel.org>]

On Mon, 08 Nov 2021 11:01:59 -0800, jae.hyun.yoo@intel.com wrote:
> From: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
> 
> If LPC KCS driver is registered ahead of lpc-ctrl module, LPC KCS
> 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 KCS 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:
> Changes sinve v1:
>  * Added 'clocks' property into kcs-bmc bindings using
>    'aspeed,ast2400-kcs-bmc.yaml' 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-kcs-bmc.yaml   | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

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