Re: [PATCH v6][RESEND] platform: x86: New BayTrail IOSF-SB MBI driver
From: Randy Dunlap
Date: Tue Jan 07 2014 - 14:31:12 EST
On 01/07/14 10:48, David E. Box wrote:
> On Tue, Jan 07, 2014 at 10:15:03AM -0800, Randy Dunlap wrote:
>> On 01/07/14 10:03, David E. Box wrote:
>>> From: "David E. Box" <david.e.box@xxxxxxxxxxxxxxx>
>>> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
>>> index b51a746..6e199a5 100644
>>> --- a/drivers/platform/x86/Kconfig
>>> +++ b/drivers/platform/x86/Kconfig
>>> @@ -819,4 +819,14 @@ config PVPANIC
>>> a paravirtualized device provided by QEMU; it lets a virtual machine
>>> (guest) communicate panic events to the host.
>>> +config INTEL_BAYTRAIL_MBI
>>> + tristate
>> Is this kconfig option displayed when you run menuconfig/nconfig/xconfig/gconfig etc.?
>> Doesn't it need a prompt string?
>> How did you enable it and test it?
> It is not displayed on purpose. The driver isn't exposed to user space.
> It was tested by adding the option to .config, both as module and built-in.
>>> + depends on PCI
>>> + ---help---
>>> + Needed on Baytrail platforms for access to the IOSF Sideband Mailbox
>>> + Interface. This is a requirement for systems that need to configure
>>> + the PUNIT for power management features such as RAPL. Register
>>> + addresses and r/w opcodes are defined in
>> Think of users reading this. At least change "r/w" to read/write.
>> What is IOSF? does it matter here?
>> PUNIT? RAPL?
> If you don't know what the IOSF Sideband is you probably shouldn't be enabling
> this feature. Users of this driver (of which for now there are few) will be
> kernel space drivers that should have ample knowledge of the registers this
> interface provides access to.
I see. Thanks.
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