pinctrl: meson-gx: add support for getting pinmux status
In order to support the "pinmux status" command, use the common functions to get the pins count and names, and add the GX specific function to get the current function from registers. Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com> Tested-by: NMaxime Jourdan <mjourdan@baylibre.com>
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