clk: mediatek: Pass device to clk_hw_register for PLLs

Passing the struct device pointer to clk_hw_register allows for runtime
power management to work for the registered clock controllers. However,
the mediatek PLL clocks do not do this.

Change this by adding a struct device pointer argument to
mtk_clk_register_pll, and fix up the only other user of it. Also add a
new member to the struct mtk_clk_pll for the struct device pointer,
which is set by mtk_clk_register_pll and is used by
mtk_clk_register_pll_ops.

If mtk_clk_register_pll is called with a NULL struct device pointer,
then everything still works as expected; the clock core will simply
treat them as previously, i.e. without runtime power management.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Nicolas Frattaroli

drivers/clk/mediatek/clk-pll.c

@@ -366,15 +366,16 @@ struct clk_hw *mtk_clk_register_pll_ops(struct mtk_clk_pll *pll,
 		init.parent_names = &parent_name;
 	init.num_parents = 1;
 
-	ret = clk_hw_register(NULL, &pll->hw);
+	ret = clk_hw_register(pll->dev, &pll->hw);
 
 	if (ret)
 		return ERR_PTR(ret);
 
 	return &pll->hw;
 }
 
-struct clk_hw *mtk_clk_register_pll(const struct mtk_pll_data *data,
+struct clk_hw *mtk_clk_register_pll(struct device *dev,
+				    const struct mtk_pll_data *data,
 				    void __iomem *base)
 {
 	struct mtk_clk_pll *pll;
@@ -385,6 +386,8 @@ struct clk_hw *mtk_clk_register_pll(const struct mtk_pll_data *data,
 	if (!pll)
 		return ERR_PTR(-ENOMEM);
 
+	pll->dev = dev;
+
 	hw = mtk_clk_register_pll_ops(pll, data, base, pll_ops);
 	if (IS_ERR(hw))
 		kfree(pll);
@@ -428,7 +431,7 @@ int mtk_clk_register_plls(struct device *dev,
 			continue;
 		}
 
-		hw = mtk_clk_register_pll(pll, base);
+		hw = mtk_clk_register_pll(dev, pll, base);
 
 		if (IS_ERR(hw)) {
 			pr_err("Failed to register clk %s: %pe\n", pll->name,

drivers/clk/mediatek/clk-pll.h

@@ -61,6 +61,7 @@ struct mtk_pll_data {
  */
 
 struct mtk_clk_pll {
+	struct device *dev;
 	struct clk_hw	hw;
 	void __iomem	*base_addr;
 	void __iomem	*pd_addr;
@@ -108,7 +109,8 @@ struct clk_hw *mtk_clk_register_pll_ops(struct mtk_clk_pll *pll,
 					const struct mtk_pll_data *data,
 					void __iomem *base,
 					const struct clk_ops *pll_ops);
-struct clk_hw *mtk_clk_register_pll(const struct mtk_pll_data *data,
+struct clk_hw *mtk_clk_register_pll(struct device *dev,
+				    const struct mtk_pll_data *data,
 				    void __iomem *base);
 void mtk_clk_unregister_pll(struct clk_hw *hw);
 

drivers/clk/mediatek/clk-pllfh.c

@@ -220,7 +220,7 @@ int mtk_clk_register_pllfhs(struct device_node *node,
 		if (use_fhctl)
 			hw = mtk_clk_register_pllfh(pll, pllfh, base);
 		else
-			hw = mtk_clk_register_pll(pll, base);
+			hw = mtk_clk_register_pll(NULL, pll, base);
 
 		if (IS_ERR(hw)) {
 			pr_err("Failed to register %s clk %s: %ld\n",