linux-kernel - Re: [PATCH v2] i2c: designware: Add ACPI HID for DWAPB I2C controller on FUJITSU-MONAKA

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Message-ID: <Zxn_Ye-JmxSKuhkq@smile.fi.intel.com>
Date: Thu, 24 Oct 2024 11:03:45 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Yoshihiro Furudera <fj5100bi@...itsu.com>
Cc: Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jan Dabros <jsd@...ihalf.com>, Andi Shyti <andi.shyti@...nel.org>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: designware: Add ACPI HID for DWAPB I2C
 controller on FUJITSU-MONAKA

On Thu, Oct 24, 2024 at 07:15:53AM +0000, Yoshihiro Furudera wrote:
> Enable DWAPB I2C controller support on FUJITSU-MONAKA.
> This will be used in the FUJITSU-MONAKA server scheduled
> for shipment in 2027.
> 
> The DSDT information obtained when verified using an
> in-house simulator is presented below.
> 
>      Device (SMB0)
>      {
>          Name (_HID, "FUJI200B")  // _HID: Hardware ID
>          Name (_UID, Zero)  // _UID: Unique ID
>          ...
>          Name (_CRS, ResourceTemplate ()
>          {
>              Memory32Fixed (ReadWrite,
>                  0x2A4B0000,         // Address Base
>                  0x00010000,         // Address Length
>                  )
>              Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
>              {
>                  0x00000159,
>              }
>          })
>          ...
>      }
> 
> The expression SMB0 is used to indicate SMBus HC#0,
> a string of up to four characters.
> 
> Created the SMB0 object according to the following
> specifications:
> 
> ACPI Specification
> 13.2. Accessing the SMBus from ASL Code
> https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/13_ACPI_System_Mgmt_Bus_Interface_Spec/accessing-the-smbus-from-asl-code.html
> 
> IPMI Specification
> Example 4: SSIF Interface(P574)
> https://www.intel.co.jp/content/www/jp/ja/products/docs/servers/ipmi/ipmi-second-gen-interface-spec-v2-rev1-1.html

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

-- 
With Best Regards,
Andy Shevchenko