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36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
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From a7c1456eb3e8f99ed908b2ccce9a4045c2d3c85e Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 14 Mar 2024 09:55:31 +0000
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Subject: [PATCH 0965/1085] i2c: mux: Add support for generic base-nr property
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i2c_mux_add_adapter takes a force_nr parameter that allows an explicit
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bus number to be associated with a channel. However, only i2c-mux-reg
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and i2c-mux-gpio make use of it.
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To help with situations where it is desirable to have a fixed, known
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base address for the channels of a mux, create a "base-nr" property.
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When force_nr is 0 and base-nr is set and non-zero, form a force_nr
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value from the sum of base-nr and the channel ID.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/i2c/i2c-mux.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/drivers/i2c/i2c-mux.c
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+++ b/drivers/i2c/i2c-mux.c
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@@ -355,8 +355,13 @@ int i2c_mux_add_adapter(struct i2c_mux_c
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if (muxc->dev->of_node) {
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struct device_node *dev_node = muxc->dev->of_node;
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struct device_node *mux_node, *child = NULL;
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+ u32 base_nr = 0;
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u32 reg;
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+ of_property_read_u32(dev_node, "base-nr", &base_nr);
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+ if (!force_nr)
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+ force_nr = base_nr;
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+
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if (muxc->arbitrator)
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mux_node = of_get_child_by_name(dev_node, "i2c-arb");
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else if (muxc->gate)
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