linux-kernel - [PATCH v7 2/5] i2c: designware: Add quirk for Intel Xe

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Message-Id: <20250710071612.2714990-3-raag.jadav@intel.com>
Date: Thu, 10 Jul 2025 12:46:09 +0530
From: Raag Jadav <raag.jadav@...el.com>
To: lucas.demarchi@...el.com,
	thomas.hellstrom@...ux.intel.com,
	rodrigo.vivi@...el.com
Cc: jarkko.nikula@...ux.intel.com,
	airlied@...il.com,
	simona@...ll.ch,
	andriy.shevchenko@...ux.intel.com,
	mika.westerberg@...ux.intel.com,
	jsd@...ihalf.com,
	andi.shyti@...nel.org,
	raag.jadav@...el.com,
	riana.tauro@...el.com,
	srinivasa.adatrao@...el.com,
	michael.j.ruhl@...el.com,
	intel-xe@...ts.freedesktop.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Andi Shyti <andi.shyti@...ux.intel.com>
Subject: [PATCH v7 2/5] i2c: designware: Add quirk for Intel Xe

From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

The regmap is coming from the parent also in case of Xe
GPUs. Reusing the Wangxun quirk for that.

Originally-by: Michael J. Ruhl <michael.j.ruhl@...el.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 3104f52e32be..a35e4c64a1d4 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -101,7 +101,7 @@ static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
 }
 #endif
 
-static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
+static int dw_i2c_get_parent_regmap(struct dw_i2c_dev *dev)
 {
 	dev->map = dev_get_regmap(dev->dev->parent, NULL);
 	if (!dev->map)
@@ -123,12 +123,15 @@ static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
 	struct platform_device *pdev = to_platform_device(dev->dev);
 	int ret;
 
+	if (device_is_compatible(dev->dev, "intel,xe-i2c"))
+		return dw_i2c_get_parent_regmap(dev);
+
 	switch (dev->flags & MODEL_MASK) {
 	case MODEL_BAIKAL_BT1:
 		ret = bt1_i2c_request_regs(dev);
 		break;
 	case MODEL_WANGXUN_SP:
-		ret = txgbe_i2c_request_regs(dev);
+		ret = dw_i2c_get_parent_regmap(dev);
 		break;
 	default:
 		dev->base = devm_platform_ioremap_resource(pdev, 0);
-- 
2.34.1