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Xingyu Chen 294a05a220 pinctrl: add pinctrl&gpio support for g12a
PD#156734: pinctrl: add pinctrl&gpio support for g12a

the new pin feature (drive-strength) is first introduced in Meson
Series SoC [G12A]. we can refer the following example to use:
mux {
	groups = "uart_ao_tx_a", "uart_ao_rx_a";
	function = "uart_ao_a";

	drive-strength = <1>;
}

the value of drive-strength can be set to 0/1/2/3, the larger
the value, the faster the slew rate.

Change-Id: I22c6967aa1d5de1b3f6acb84cb18a79b05c0403b
Signed-off-by: Xingyu Chen <xingyu.chen@amlogic.com>
2018-03-02 14:52:26 +08:00
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