2022-04-22 15:00:47 +00:00
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From 78dacf2306cab90184c26815e14c8f132d779ab9 Mon Sep 17 00:00:00 2001
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2021-11-24 17:32:01 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 20 Feb 2018 10:07:27 +0000
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2022-04-22 15:00:47 +00:00
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Subject: [PATCH 097/828] i2c-gpio: Also set bus numbers from reg property
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2021-11-24 17:32:01 +00:00
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I2C busses can be assigned specific bus numbers using aliases in
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Device Tree - string properties where the name is the alias and the
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value is the path to the node. The current DT parameter mechanism
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does not allow property names to be derived from a parameter value
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in any way, so it isn't possible to generate unique or matching
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aliases for nodes from an overlay that can generate multiple
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instances, e.g. i2c-gpio.
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Work around this limitation (at least temporarily) by allowing
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the i2c adapter number to be initialised from the "reg" property
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if present.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/i2c/busses/i2c-gpio.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/drivers/i2c/busses/i2c-gpio.c
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+++ b/drivers/i2c/busses/i2c-gpio.c
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2022-04-22 15:00:47 +00:00
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@@ -445,7 +445,9 @@ static int i2c_gpio_probe(struct platfor
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2021-11-24 17:32:01 +00:00
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adap->dev.parent = dev;
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adap->dev.of_node = np;
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- adap->nr = pdev->id;
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+ if (pdev->id != PLATFORM_DEVID_NONE || !pdev->dev.of_node ||
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+ of_property_read_u32(pdev->dev.of_node, "reg", &adap->nr))
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+ adap->nr = pdev->id;
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ret = i2c_bit_add_numbered_bus(adap);
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if (ret)
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return ret;
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