mux: add devm_mux_state_get_from_np() to get mux from child node

Add new API devm_mux_state_get_from_np() to retrieve a mux control from
a specified child device node.

Make devm_mux_state_get() call devm_mux_state_get_from_np() with a NULL
node parameter, which defaults to using the device's own of_node.

Support the following DT schema:

pinctrl@0 {
    uart-func {
            mux-state = <&mux_chip 0>;
    };

    spi-func {
            mux-state = <&mux_chip 1>;
    };
};

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

0 files changed, 0 insertions, 0 deletions