add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/spi/spi-cavium.c
..
..
@@ -119,8 +119,7 @@
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 			*rx_buf++ = (u8)v;
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 		}
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-	if (xfer->delay_usecs)
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-		udelay(xfer->delay_usecs);
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+	spi_transfer_delay_exec(xfer);
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 	return xfer->len;
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 }