linux-kernel - Re: [PATCH] i2c: designware: Add support for AMD Seattle I2C

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Message-ID: <20151216091652.GN1762@lahna.fi.intel.com>
Date:	Wed, 16 Dec 2015 11:16:52 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	wsa@...-dreams.de, linux-i2c@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: designware: Add support for AMD Seattle I2C

On Tue, Dec 15, 2015 at 08:14:34PM -0600, Suravee Suthikulpanit wrote:
> Hi Mika,
> 
> On 12/15/15 15:55, Suravee Suthikulpanit wrote:
> >Add device HID AMDI0510 to match the I2C controlers on AMD Seattle platform
> >
> >Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....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 57f623b..a027154 100644
> >--- a/drivers/i2c/busses/i2c-designware-platdrv.c
> >+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> >@@ -117,6 +117,7 @@ static const struct acpi_device_id dw_i2c_acpi_match[] = {
> >  	{ "80860F41", 0 },
> >  	{ "808622C1", 0 },
> >  	{ "AMD0010", 0 },
> >+	{ "AMDI0510", 0 },
> >  	{ }
> 
> Since this driver seems to be used by several SOCs, and we have been adding
> the HID from various SOC vendors. Do you think it would be better to assign
> a CID so that each SOC vendor can specify in their ACPI DSDT and we can
> match them here?

Sure _CID would work here.

> Then, we can also associate the FMCN and SSCN along with the CID, and
> guarantee compatibility.

Well, the driver checks those everytime it finds that the device has
ACPI companion regardless of _HID/_CID.
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