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

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Message-Id: <20241024071553.3073864-1-fj5100bi@fujitsu.com>
Date: Thu, 24 Oct 2024 07:15:53 +0000
From: Yoshihiro Furudera <fj5100bi@...itsu.com>
To: Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...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,
	Yoshihiro Furudera <fj5100bi@...itsu.com>
Subject: [PATCH v2] i2c: designware: Add ACPI HID for DWAPB I2C controller on FUJITSU-MONAKA

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

Signed-off-by: Yoshihiro Furudera <fj5100bi@...itsu.com>
---
Changes in v2:
- Updated the commit message as per previous discussion. (Andy)
- Change the string "Fujitsu MONAKA" to "FUJITSU-MONAKA"
- Link to v1: https://lore.kernel.org/all/20241018015826.2925075-1-fj5100bi@fujitsu.com/

 drivers/i2c/busses/i2c-designware-platdrv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 2d0c7348e491..c04af315a4f9 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -351,6 +351,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = {
 	{ "AMDI0019", ACCESS_INTR_MASK | ARBITRATION_SEMAPHORE },
 	{ "AMDI0510", 0 },
 	{ "APMC0D0F", 0 },
+	{ "FUJI200B", 0 },
 	{ "HISI02A1", 0 },
 	{ "HISI02A2", 0 },
 	{ "HISI02A3", 0 },
-- 
2.34.1