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dts: bcm2712-rpi: Add aliases for the CSI/DSI I2Cs

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Older Pis arrange that the camera I2C ports appear as /dev/i2c-10. Add
aliases so that on the Pi 5 family, i2c_csi_dsi0 becomes i2c-10 and
i2c_csi_dsi1 becomes i2c-11. Only the I2C buses that appear on the
40-pin header, i.e. I2C0 to I2C3, get a low bus number.

Also add hints for our udev rules about which symlinks to create for
backwards-compatibility with the previous bus numbers. Note that
lower numbers have priority, so i2c-0 on CM5 masks i2c-11, forcing
i2c-11 to be a symlink to i2c-0, not vice versa.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2024-10-16 11:31:04 +01:00
committed by Phil Elwell
parent 18d185166c
commit 36faab69e8
3 changed files with 7 additions and 4 deletions
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2
arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
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@@ -255,12 +255,14 @@ i2c_csi_dsi0: &i2c6 { // Note: This is for MIPI0 connector only
pinctrl-0 = <&rp1_i2c6_38_39>; pinctrl-0 = <&rp1_i2c6_38_39>;
pinctrl-names = "default"; pinctrl-names = "default";
clock-frequency = <100000>; clock-frequency = <100000>;
symlink = "i2c-6";
}; };
i2c_csi_dsi1: &i2c4 { // Note: This is for MIPI1 connector only i2c_csi_dsi1: &i2c4 { // Note: This is for MIPI1 connector only
pinctrl-0 = <&rp1_i2c4_40_41>; pinctrl-0 = <&rp1_i2c4_40_41>;
pinctrl-names = "default"; pinctrl-names = "default";
clock-frequency = <100000>; clock-frequency = <100000>;
symlink = "i2c-4";
}; };
i2c_csi_dsi: &i2c_csi_dsi1 { }; // An alias for compatibility i2c_csi_dsi: &i2c_csi_dsi1 { }; // An alias for compatibility

2
arch/arm64/boot/dts/broadcom/bcm2712-rpi-cm5.dtsi
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@@ -238,9 +238,11 @@ i2c_csi_dsi0: &i2c6 { // Note: This is for MIPI0 connector only
pinctrl-0 = <&rp1_i2c6_38_39>; pinctrl-0 = <&rp1_i2c6_38_39>;
pinctrl-names = "default"; pinctrl-names = "default";
clock-frequency = <100000>; clock-frequency = <100000>;
symlink = "i2c-6";
}; };
i2c_csi_dsi1: &i2c0 { // Note: This is for MIPI1 connector i2c_csi_dsi1: &i2c0 { // Note: This is for MIPI1 connector
symlink = "i2c-11";
}; };
i2c_csi_dsi: &i2c_csi_dsi1 { }; // An alias for compatibility i2c_csi_dsi: &i2c_csi_dsi1 { }; // An alias for compatibility

7
arch/arm64/boot/dts/broadcom/bcm2712-rpi.dtsi
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@@ -117,12 +117,11 @@
i2c = &i2c_arm; i2c = &i2c_arm;
i2c0 = &i2c0; i2c0 = &i2c0;
i2c1 = &i2c1; i2c1 = &i2c1;
i2c10 = &i2c_rp1boot;
i2c2 = &i2c2; i2c2 = &i2c2;
i2c3 = &i2c3; i2c3 = &i2c3;
i2c4 = &i2c4; i2c10 = &i2c_csi_dsi0;
i2c5 = &i2c5; i2c11 = &i2c_csi_dsi1;
i2c6 = &i2c6; i2c12 = &i2c_rp1boot;
mailbox = &mailbox; mailbox = &mailbox;
mmc0 = &sdio1; mmc0 = &sdio1;
serial0 = &uart0; serial0 = &uart0;