linux-kernel - Re: [PATCH arm/aspeed/ast2500 v1] eSPI: add Aspeed AST2500 eSPI driver to boot a host with PCH runs on eSPI

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Date:   Tue, 23 Jan 2018 09:44:57 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Haiyue Wang <haiyue.wang@...ux.intel.com>
Cc:     joel@....id.au, arnd@...db.de, openbmc@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, andriy.shevchenko@...el.com
Subject: Re: [PATCH arm/aspeed/ast2500 v1] eSPI: add Aspeed AST2500 eSPI
 driver to boot a host with PCH runs on eSPI

On Tue, Jan 16, 2018 at 07:52:32PM +0800, Haiyue Wang wrote:
> When PCH works under eSPI mode, the PMC (Power Management Controller) in
> PCH is waiting for SUS_ACK from BMC after it alerts SUS_WARN. It is in
> dead loop if no SUS_ACK assert. This is the basic requirement for the BMC
> works as eSPI slave.
> 
> Also for the host power on / off actions, from BMC side, the following VW
> (Virtual Wire) messages are done in firmware:
> 1. SLAVE_BOOT_LOAD_DONE / SLAVE_BOOT_LOAD_STATUS
> 2. SUS_ACK
> 3. OOB_RESET_ACK
> 4. HOST_RESET_ACK
> 
> Signed-off-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
> ---
>  .../devicetree/bindings/misc/aspeed-espi-slave.txt |  20 ++
>  Documentation/misc-devices/espi-slave.rst          | 114 +++++++++

DT files need to be split out into a separate patch so that the DT
maintainers can properly review them.

> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -471,6 +471,17 @@ config VEXPRESS_SYSCFG
>  	  ARM Ltd. Versatile Express uses specialised platform configuration
>  	  bus. System Configuration interface is one of the possible means
>  	  of generating transactions on this bus.
> +config ASPEED_ESPI_SLAVE

You need a blank line above this one please.

> +	depends on ARCH_ASPEED || COMPILE_TEST
> +	select REGMAP_MMIO

Select or depend?

> +	tristate "Aspeed ast2500 eSPI slave device"
> +	---help---
> +	  This allows host to access Baseboard Management Controller (BMC) over the
> +	  Enhanced Serial Peripheral Interface (eSPI) bus, which replaces the Low Pin
> +	  Count (LPC) bus.
> +
> +	  Its interface supports peripheral, virtual wire, out-of-band, and flash
> +	  sharing channels.

What is the module name?

>  
>  config ASPEED_LPC_CTRL
>  	depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index 5ca5f64..a1081f4 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_GENWQE)		+= genwqe/
>  obj-$(CONFIG_ECHO)		+= echo/
>  obj-$(CONFIG_VEXPRESS_SYSCFG)	+= vexpress-syscfg.o
>  obj-$(CONFIG_CXL_BASE)		+= cxl/
> +obj-$(CONFIG_ASPEED_ESPI_SLAVE) += aspeed-espi-slave.o

Why no tab?

thanks,

greg k-h