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From: Eddie James <>
Cc: Eddie James <>
Subject: [PATCH linux dev-5.14] ARM: dts: aspeed: everest: Add IBM Operation Panel I2C device
Date: Thu, 23 Sep 2021 14:45:15 -0500	[thread overview]
Message-ID: <> (raw)

Set I2C bus 14 to multi-master mode and add the panel device that will
register the I2C controller as a slave device.
In addition, in early Everest systems, the panel device was behind an
I2C switch, which doesn't work for slave mode. Get it working (albeit
unreliably, since a master transaction might switch the switch at any
moment) by defaulting the switch channel to the one with the panel.

Signed-off-by: Eddie James <>
 arch/arm/boot/dts/aspeed-bmc-ibm-everest.dts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/aspeed-bmc-ibm-everest.dts b/arch/arm/boot/dts/aspeed-bmc-ibm-everest.dts
index bb6bbcb4e14f..4d95178648b1 100644
--- a/arch/arm/boot/dts/aspeed-bmc-ibm-everest.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-ibm-everest.dts
@@ -2441,15 +2441,21 @@ eeprom@52 {
 &i2c14 {
+	multi-master;
 	status = "okay";
+	ibm-panel@62 {
+		compatible = "ibm,op-panel";
+		reg = <(0x62 | I2C_OWN_SLAVE_ADDRESS)>;
+	};
 	i2c-switch@70 {
 		compatible = "nxp,pca9546";
 		reg = <0x70>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "okay";
-		i2c-mux-idle-disconnect;
+		idle-state = <1>;
 		i2c14mux0chn0: i2c@0 {
 			#address-cells = <1>;

                 reply	other threads:[~2021-09-23 19:46 UTC|newest]

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