sata: dwc_ahsata: implement sata_port_status
Define the new common function sata_port_status() which can be used to query the sata driver for the state of ports, and implement it for dwc_ahsata. Cc: Stefano Babic <sbabic@denx.de> Cc: Tom Rini <trini@ti.com> Cc: Marek Vasut <marex@denx.de> Reviewed-by: NMarek Vasut <marex@denx.de> Signed-off-by: NNikita Kiryanov <nikita@compulab.co.il>
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