fbdev/ssd1307fb: add support to enable VBAT
SSD1306 needs VBAT when it is wired in charge pump configuration. This patch adds support to the driver to enable VBAT regulator at init time. Cc: Rob Herring <robh+dt@kernel.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Benoît Cousson <bcousson@baylibre.com> Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com> Reviewed-by: NRoger Quadros <rogerq@ti.com> Signed-off-by: NJyri Sarha <jsarha@ti.com> Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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