pmdomain: mediatek: convert from clk round_rate() to determine_rate()

The round_rate() clk ops is deprecated in the clk framework in favor
of the determine_rate() clk ops, so let's convert this driver so that
round_rate() can be removed from the clk core.

Signed-off-by: Brian Masney <bmasney@redhat.com>
Reviewed-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: masneyb

drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c

@@ -309,11 +309,11 @@ static unsigned long mtk_mfg_recalc_rate_gpu(struct clk_hw *hw,
 	return readl(mfg->shared_mem + GF_REG_FREQ_OUT_GPU) * HZ_PER_KHZ;
 }
 
-static long mtk_mfg_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *parent_rate)
+static int mtk_mfg_determine_rate(struct clk_hw *hw,
+				  struct clk_rate_request *req)
 {
 	/*
-	 * The round_rate callback needs to be implemented to avoid returning
+	 * The determine_rate callback needs to be implemented to avoid returning
 	 * the current clock frequency, rather than something even remotely
 	 * close to the frequency that was asked for.
 	 *
@@ -325,7 +325,7 @@ static long mtk_mfg_round_rate(struct clk_hw *hw, unsigned long rate,
 	 * high current frequency, breaking the powersave governor in the process.
 	 */
 
-	return rate;
+	return 0;
 }
 
 static unsigned long mtk_mfg_recalc_rate_stack(struct clk_hw *hw,
@@ -338,12 +338,12 @@ static unsigned long mtk_mfg_recalc_rate_stack(struct clk_hw *hw,
 
 static const struct clk_ops mtk_mfg_clk_gpu_ops = {
 	.recalc_rate = mtk_mfg_recalc_rate_gpu,
-	.round_rate = mtk_mfg_round_rate,
+	.determine_rate = mtk_mfg_determine_rate,
 };
 
 static const struct clk_ops mtk_mfg_clk_stack_ops = {
 	.recalc_rate = mtk_mfg_recalc_rate_stack,
-	.round_rate = mtk_mfg_round_rate,
+	.determine_rate = mtk_mfg_determine_rate,
 };
 
 static const struct clk_init_data mtk_mfg_clk_gpu_init = {