[PATCH v3 0/5] Remove LPC register partitioning

Jonathan Cameron Jonathan.Cameron at Huawei.com
Tue Jan 5 02:30:20 AEDT 2021

On Mon, 21 Dec 2020 13:56:18 +0800
"Chia-Wei, Wang" <chiawei_wang at aspeedtech.com> wrote:

> The LPC controller has no concept of the BMC and the Host partitions.
> The incorrect partitioning can impose unnecessary range restrictions
> on register access through the syscon regmap interface.
> For instance, HICRB contains the I/O port address configuration
> of KCS channel 1/2. However, the KCS#1/#2 drivers cannot access
> HICRB as it is located at the other LPC partition.
> In addition, to be backward compatible, the newly added HW control
> bits could be located at any reserved bits over the LPC addressing
> space.
> Thereby, this patch series aims to remove the LPC partitioning for
> better driver development and maintenance. This requires the change
> to both the device tree and the driver implementation. To ensure
> both sides are synchronously updated, a v2 binding check is added.
> Changes since v2:
> 	- Add v2 binding check to ensure the synchronization between the
> 	  device tree change and the driver register offset fix.
> Changes since v1:
> 	- Add the fix to the aspeed-lpc binding documentation.
> Chia-Wei, Wang (5):
>   dt-bindings: aspeed-lpc: Remove LPC partitioning
>   ARM: dts: Remove LPC BMC and Host partitions
>   ipmi: kcs: aspeed: Adapt to new LPC DTS layout
>   pinctrl: aspeed-g5: Adapt to new LPC device tree layout
>   soc: aspeed: Adapt to new LPC device tree layout
>  .../devicetree/bindings/mfd/aspeed-lpc.txt    |  99 +++----------
>  arch/arm/boot/dts/aspeed-g4.dtsi              |  74 ++++------
>  arch/arm/boot/dts/aspeed-g5.dtsi              | 135 ++++++++----------
>  arch/arm/boot/dts/aspeed-g6.dtsi              | 135 ++++++++----------
>  drivers/char/ipmi/kcs_bmc_aspeed.c            |  35 +++--
>  drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c    |  19 ++-
>  drivers/soc/aspeed/aspeed-lpc-ctrl.c          |  20 ++-
>  drivers/soc/aspeed/aspeed-lpc-snoop.c         |  23 +--
>  8 files changed, 232 insertions(+), 308 deletions(-)

New year, new campaign to make people's lives slightly easier :)

I would appreciate it if everyone made sure their cover letters have an
appropriate "scope" defined.   This is going to broad mailing
lists so it would be good to give it a title of something like
"aspeed: Remove LPC register partitioning"
possibly even
"arm: aspeed: Remove LPC register partitioning"

both to make it stand out to people who do want to read it and to
allow others to rapidly conclude they can skip the thread.



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