linux-kernel - [PATCH AUTOSEL 6.1 27/27] i2c: rk3x: Adjust mask/value offset for i2c2 on rv1126

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Message-ID: <20240128161424.203600-27-sashal@kernel.org>
Date: Sun, 28 Jan 2024 11:14:12 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tim Lunn <tim@...thertop.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Andi Shyti <andi.shyti@...nel.org>,
	Wolfram Sang <wsa@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-i2c@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 27/27] i2c: rk3x: Adjust mask/value offset for i2c2 on rv1126

From: Tim Lunn <tim@...thertop.org>

[ Upstream commit 92a85b7c6262f19c65a1c115cf15f411ba65a57c ]

Rockchip RV1126 is using old style i2c controller, the i2c2
bus uses a non-sequential offset in the grf register for the
mask/value bits for this bus.

This patch fixes i2c2 bus on rv1126 SoCs.

Signed-off-by: Tim Lunn <tim@...thertop.org>
Acked-by: Heiko Stuebner <heiko@...ech.de>
Reviewed-by: Andi Shyti <andi.shyti@...nel.org>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-rk3x.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
index 6aa4f1f06240..c8cd5cadcf56 100644
--- a/drivers/i2c/busses/i2c-rk3x.c
+++ b/drivers/i2c/busses/i2c-rk3x.c
@@ -1295,8 +1295,12 @@ static int rk3x_i2c_probe(struct platform_device *pdev)
 			return -EINVAL;
 		}
 
-		/* 27+i: write mask, 11+i: value */
-		value = BIT(27 + bus_nr) | BIT(11 + bus_nr);
+		/* rv1126 i2c2 uses non-sequential write mask 20, value 4 */
+		if (i2c->soc_data == &rv1126_soc_data && bus_nr == 2)
+			value = BIT(20) | BIT(4);
+		else
+			/* 27+i: write mask, 11+i: value */
+			value = BIT(27 + bus_nr) | BIT(11 + bus_nr);
 
 		ret = regmap_write(grf, i2c->soc_data->grf_offset, value);
 		if (ret != 0) {
-- 
2.43.0