linux-kernel - [PATCH 2/6] usb: dwc3: Get clocks individually

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Message-Id: <20220114233904.907918-3-sean.anderson@seco.com>
Date:   Fri, 14 Jan 2022 18:39:00 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Robert Hancock <robert.hancock@...ian.com>,
        Baruch Siach <baruch@...s.co.il>,
        Felipe Balbi <balbi@...nel.org>,
        Balaji Prakash J <bjagadee@...eaurora.org>,
        Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH 2/6] usb: dwc3: Get clocks individually

Instead of grabbing all clocks in bulk, grab them individually. This will
allow us to get the frequency or otherwise deal with discrete clocks. This
may break some platforms if they use a clock which doesn't use one of the
documented names.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

 drivers/usb/dwc3/core.c | 62 +++++++++++++++++++++++++++++++++--------
 drivers/usb/dwc3/core.h |  5 ++--
 2 files changed, 53 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f4c09951b517..699ab9abdc47 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -745,6 +745,38 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	return 0;
 }
 
+static int dwc3_clk_enable(struct dwc3 *dwc)
+{
+	int ret;
+
+	ret = clk_prepare_enable(dwc->bus_clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(dwc->ref_clk);
+	if (ret)
+		goto disable_bus_clk;
+
+	ret = clk_prepare_enable(dwc->susp_clk);
+	if (ret)
+		goto disable_ref_clk;
+
+	return 0;
+
+disable_ref_clk:
+	clk_disable_unprepare(dwc->ref_clk);
+disable_bus_clk:
+	clk_disable_unprepare(dwc->bus_clk);
+	return ret;
+}
+
+static void dwc3_clk_disable(struct dwc3 *dwc)
+{
+	clk_disable_unprepare(dwc->susp_clk);
+	clk_disable_unprepare(dwc->ref_clk);
+	clk_disable_unprepare(dwc->bus_clk);
+}
+
 static void dwc3_core_exit(struct dwc3 *dwc)
 {
 	dwc3_event_buffers_cleanup(dwc);
@@ -758,7 +790,7 @@ static void dwc3_core_exit(struct dwc3 *dwc)
 	usb_phy_set_suspend(dwc->usb3_phy, 1);
 	phy_power_off(dwc->usb2_generic_phy);
 	phy_power_off(dwc->usb3_generic_phy);
-	clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
+	dwc3_clk_disable(dwc);
 	reset_control_assert(dwc->reset);
 }
 
@@ -1605,25 +1637,31 @@ static int dwc3_probe(struct platform_device *pdev)
 		return PTR_ERR(dwc->reset);
 
 	if (dev->of_node) {
-		ret = devm_clk_bulk_get_all(dev, &dwc->clks);
-		if (ret == -EPROBE_DEFER)
-			return ret;
 		/*
 		 * Clocks are optional, but new DT platforms should support all
 		 * clocks as required by the DT-binding.
 		 */
-		if (ret < 0)
-			dwc->num_clks = 0;
-		else
-			dwc->num_clks = ret;
+		dwc->bus_clk = devm_clk_get_optional(dev, "bus_early");
+		if (IS_ERR(dwc->bus_clk))
+			return dev_err_probe(dev, PTR_ERR(dwc->bus_clk),
+					     "could not get bus clock\n");
 
+		dwc->ref_clk = devm_clk_get_optional(dev, "ref");
+		if (IS_ERR(dwc->ref_clk))
+			return dev_err_probe(dev, PTR_ERR(dwc->ref_clk),
+					     "could not get ref clock\n");
+
+		dwc->susp_clk = devm_clk_get_optional(dev, "suspend");
+		if (IS_ERR(dwc->susp_clk))
+			return dev_err_probe(dev, PTR_ERR(dwc->susp_clk),
+					     "could not get suspend clock\n");
 	}
 
 	ret = reset_control_deassert(dwc->reset);
 	if (ret)
 		return ret;
 
-	ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
+	ret = dwc3_clk_enable(dwc);
 	if (ret)
 		goto assert_reset;
 
@@ -1711,7 +1749,7 @@ static int dwc3_probe(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 
 disable_clks:
-	clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
+	dwc3_clk_disable(dwc);
 assert_reset:
 	reset_control_assert(dwc->reset);
 
@@ -1755,7 +1793,7 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc)
 	if (ret)
 		return ret;
 
-	ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
+	ret = dwc3_clk_enable(dwc);
 	if (ret)
 		goto assert_reset;
 
@@ -1766,7 +1804,7 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc)
 	return 0;
 
 disable_clks:
-	clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
+	dwc3_clk_disable(dwc);
 assert_reset:
 	reset_control_assert(dwc->reset);
 
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index e1cc3f7398fb..32dfcf3a83d5 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1134,8 +1134,9 @@ struct dwc3 {
 	struct usb_gadget	*gadget;
 	struct usb_gadget_driver *gadget_driver;
 
-	struct clk_bulk_data	*clks;
-	int			num_clks;
+	struct clk		*bus_clk;
+	struct clk		*ref_clk;
+	struct clk		*susp_clk;
 
 	struct reset_control	*reset;
 
-- 
2.25.1