clk: bcm: rpi: Add missing logs if firmware fails

In contrary to raspberrypi_fw_set_rate(), the ops for is_prepared() and
recalc_rate() silently ignore firmware errors by just returning 0.
Since these operations should never fail, add at least error logs
to inform the user.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: lategoodbye

drivers/clk/bcm/clk-raspberrypi.c

@@ -194,8 +194,11 @@ static int raspberrypi_fw_is_prepared(struct clk_hw *hw)
 
 	ret = raspberrypi_clock_property(rpi->firmware, data,
 					 RPI_FIRMWARE_GET_CLOCK_STATE, &val);
-	if (ret)
+	if (ret) {
+		dev_err_ratelimited(rpi->dev, "Failed to get %s state: %d\n",
+				    clk_hw_get_name(hw), ret);
 		return 0;
+	}
 
 	return !!(val & RPI_FIRMWARE_STATE_ENABLE_BIT);
 }
@@ -211,8 +214,11 @@ static unsigned long raspberrypi_fw_get_rate(struct clk_hw *hw,
 
 	ret = raspberrypi_clock_property(rpi->firmware, data,
 					 RPI_FIRMWARE_GET_CLOCK_RATE, &val);
-	if (ret)
+	if (ret) {
+		dev_err_ratelimited(rpi->dev, "Failed to get %s frequency: %d\n",
+				    clk_hw_get_name(hw), ret);
 		return 0;
+	}
 
 	return val;
 }