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gpio: syscon: allow fetching syscon from parent node 

Syscon nodes can be a simple-mfd and the syscon-users then be declared
as children of this node. That way the parent-child structure can be
better represented for devices that are fully embedded in the syscon.

Therefore allow getting the syscon from the parent if neither
a special compatible nor a gpio,syscon-dev property is defined.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Levin Du <djw@t-chip.com.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Heiko Stuebner 2018-05-18 11:52:04 +08:00 committed by Linus Walleij
parent c65ef0ced1
commit aa1fdda8f7
1 changed files with 2 additions and 0 deletions
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2
drivers/gpio/gpio-syscon.c
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@ -200,6 +200,8 @@ static int syscon_gpio_probe(struct platform_device *pdev)
} else {
priv->syscon =
syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
if (IS_ERR(priv->syscon) && np->parent)
priv->syscon = syscon_node_to_regmap(np->parent);
if (IS_ERR(priv->syscon))
return PTR_ERR(priv->syscon);