can: mcp251xfd: mcp251xfd_chip_wait_for_osc_ready(): factor out into separate function

This patch factors out mcp251xfd_chip_wait_for_osc_ready() into a
separate function, it will be used in several places in the next
patches.

Link: https://lore.kernel.org/all/20220207131047.282110-7-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

@@ -246,6 +246,32 @@ mcp251xfd_chip_set_mode_nowait(const struct mcp251xfd_priv *priv,
 	return __mcp251xfd_chip_set_mode(priv, mode_req, true);
 }
 
+static int
+mcp251xfd_chip_wait_for_osc_ready(const struct mcp251xfd_priv *priv,
+				  u32 osc_reference, u32 osc_mask)
+{
+	u32 osc;
+	int err;
+
+	err = regmap_read_poll_timeout(priv->map_reg, MCP251XFD_REG_OSC, osc,
+				       (osc & osc_mask) == osc_reference,
+				       MCP251XFD_OSC_STAB_SLEEP_US,
+				       MCP251XFD_OSC_STAB_TIMEOUT_US);
+	if (mcp251xfd_reg_invalid(osc)) {
+		netdev_err(priv->ndev,
+			   "Failed to detect %s (osc=0x%08x).\n",
+			   mcp251xfd_get_model_str(priv), osc);
+		return -ENODEV;
+	} else if (err == -ETIMEDOUT) {
+		netdev_err(priv->ndev,
+			   "Timeout waiting for Oscillator Ready (osc=0x%08x, osc_reference=0x%08x)\n",
+			   osc, osc_reference);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
 static int mcp251xfd_chip_clock_enable(const struct mcp251xfd_priv *priv)
 {
 	u32 osc, osc_reference, osc_mask;
@@ -269,24 +295,7 @@ static int mcp251xfd_chip_clock_enable(const struct mcp251xfd_priv *priv)
 	if (err)
 		return err;
 
-	/* Wait for "Oscillator Ready" bit */
-	err = regmap_read_poll_timeout(priv->map_reg, MCP251XFD_REG_OSC, osc,
-				       (osc & osc_mask) == osc_reference,
-				       MCP251XFD_OSC_STAB_SLEEP_US,
-				       MCP251XFD_OSC_STAB_TIMEOUT_US);
-	if (mcp251xfd_reg_invalid(osc)) {
-		netdev_err(priv->ndev,
-			   "Failed to detect %s (osc=0x%08x).\n",
-			   mcp251xfd_get_model_str(priv), osc);
-		return -ENODEV;
-	} else if (err == -ETIMEDOUT) {
-		netdev_err(priv->ndev,
-			   "Timeout waiting for Oscillator Ready (osc=0x%08x, osc_reference=0x%08x)\n",
-			   osc, osc_reference);
-		return -ETIMEDOUT;
-	}
-
-	return err;
+	return mcp251xfd_chip_wait_for_osc_ready(priv, osc_reference, osc_mask);
 }
 
 static inline int mcp251xfd_chip_sleep(const struct mcp251xfd_priv *priv)