[PATCH v6 1/4] phy: rockchip: inno-usb2: convert clock management to bulk

[Frank Wang <frawang.cn@gmail.com>]

From: Frank Wang <frank.wang@rock-chips.com>

Since some Rockchip SoCs (e.g RK3576) have more than one clock,
this converts the clock management from single to bulk method to
make the driver more flexible.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
Changelog:
v6:
 - add Reviewed tag.

v5:
 - use dev_err_probe() in clock enable error path in probe.

v4:
 - a new patch split from the [PATCH v3 2/2], suggestions from Heiko.

v1-v3:
 - none

 drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 45 +++++++++++++++----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 6e5214862b8a3..f71266c27091e 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
@@ -229,9 +229,10 @@ struct rockchip_usb2phy_port {
  * @dev: pointer to device.
  * @grf: General Register Files regmap.
  * @usbgrf: USB General Register Files regmap.
- * @clk: clock struct of phy input clk.
+ * @clks: array of phy input clocks.
  * @clk480m: clock struct of phy output clk.
  * @clk480m_hw: clock struct of phy output clk management.
+ * @num_clks: number of phy input clocks.
  * @phy_reset: phy reset control.
  * @chg_state: states involved in USB charger detection.
  * @chg_type: USB charger types.
@@ -246,9 +247,10 @@ struct rockchip_usb2phy {
 	struct device	*dev;
 	struct regmap	*grf;
 	struct regmap	*usbgrf;
-	struct clk	*clk;
+	struct clk_bulk_data	*clks;
 	struct clk	*clk480m;
 	struct clk_hw	clk480m_hw;
+	int			num_clks;
 	struct reset_control	*phy_reset;
 	enum usb_chg_state	chg_state;
 	enum power_supply_type	chg_type;
@@ -310,6 +312,13 @@ static int rockchip_usb2phy_reset(struct rockchip_usb2phy *rphy)
 	return 0;
 }
 
+static void rockchip_usb2phy_clk_bulk_disable(void *data)
+{
+	struct rockchip_usb2phy *rphy = data;
+
+	clk_bulk_disable_unprepare(rphy->num_clks, rphy->clks);
+}
+
 static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw)
 {
 	struct rockchip_usb2phy *rphy =
@@ -376,7 +385,9 @@ rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
 {
 	struct device_node *node = rphy->dev->of_node;
 	struct clk_init_data init;
+	struct clk *refclk = NULL;
 	const char *clk_name;
+	int i;
 	int ret = 0;
 
 	init.flags = 0;
@@ -386,8 +397,15 @@ rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
 	/* optional override of the clockname */
 	of_property_read_string(node, "clock-output-names", &init.name);
 
-	if (rphy->clk) {
-		clk_name = __clk_get_name(rphy->clk);
+	for (i = 0; i < rphy->num_clks; i++) {
+		if (!strncmp(rphy->clks[i].id, "phyclk", 6)) {
+			refclk = rphy->clks[i].clk;
+			break;
+		}
+	}
+
+	if (!IS_ERR(refclk)) {
+		clk_name = __clk_get_name(refclk);
 		init.parent_names = &clk_name;
 		init.num_parents = 1;
 	} else {
@@ -1399,15 +1417,26 @@ static int rockchip_usb2phy_probe(struct platform_device *pdev)
 	if (IS_ERR(rphy->phy_reset))
 		return PTR_ERR(rphy->phy_reset);
 
-	rphy->clk = devm_clk_get_optional_enabled(dev, "phyclk");
-	if (IS_ERR(rphy->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(rphy->clk),
-				     "failed to get phyclk\n");
+	ret = devm_clk_bulk_get_all(dev, &rphy->clks);
+	if (ret == -EPROBE_DEFER)
+		return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
+				     "failed to get phy clock\n");
+
+	/* Clocks are optional */
+	rphy->num_clks = ret < 0 ? 0 : ret;
 
 	ret = rockchip_usb2phy_clk480m_register(rphy);
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to register 480m output clock\n");
 
+	ret = clk_bulk_prepare_enable(rphy->num_clks, rphy->clks);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable phy clock\n");
+
+	ret = devm_add_action_or_reset(dev, rockchip_usb2phy_clk_bulk_disable, rphy);
+	if (ret)
+		return ret;
+
 	if (rphy->phy_cfg->phy_tuning) {
 		ret = rphy->phy_cfg->phy_tuning(rphy);
 		if (ret)
-- 
2.25.1