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:   Thu, 25 Jan 2018 10:29:02 +0800
From:   "Wang, Haiyue" <haiyue.wang@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 2018-01-23 16:44, Greg KH wrote:
> 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.
Fixed.
>> +	depends on ARCH_ASPEED || COMPILE_TEST
>> +	select REGMAP_MMIO
> Select or depend?
Before, I used "depends on". I was told to to change "select". I'm not 
sure which is more better by practice ?
>> +	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?
You means the --help-- description is not clear and specific ?
>>   
>>   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?
Fixed, thanks.
> thanks,
>
> greg k-h