linux-kernel - [PATCH v2 2/2] usb: cdns3: cdns3-plat: Add clk and reset init

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Date:   Wed, 10 May 2023 21:28:16 +0800
From:   Minda Chen <minda.chen@...rfivetech.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <peter.chen@...nel.org>,
        Roger Quadros <rogerq@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>,
        Minda Chen <minda.chen@...rfivetech.com>
Subject: [PATCH v2 2/2] usb: cdns3: cdns3-plat: Add clk and reset init

Add gereric clk and reset init codes to Cadence USBSS
controller. The codes has been tested by starfive vf2
board.

Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
---
 drivers/usb/cdns3/cdns3-plat.c | 58 ++++++++++++++++++++++++++++++++++
 drivers/usb/cdns3/core.h       |  3 ++
 2 files changed, 61 insertions(+)

diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
index 2bc5d094548b..30da808e0a2f 100644
--- a/drivers/usb/cdns3/cdns3-plat.c
+++ b/drivers/usb/cdns3/cdns3-plat.c
@@ -12,11 +12,13 @@
  *         Roger Quadros <rogerq@...com>
  */
 
+#include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 
 #include "core.h"
 #include "gadget-export.h"
@@ -43,6 +45,40 @@ static void set_phy_power_off(struct cdns *cdns)
 	phy_power_off(cdns->usb2_phy);
 }
 
+static int cdns3_clk_rst_init(struct cdns *cdns, bool clk_only)
+{
+	int ret = 0;
+
+	if (cdns->num_clks) {
+		ret = clk_bulk_prepare_enable(cdns->num_clks, cdns->clks);
+		if (ret)
+			return ret;
+	}
+
+	if (clk_only)
+		return ret;
+
+	ret = reset_control_deassert(cdns->resets);
+	if (ret)
+		goto err_clk_init;
+
+	return ret;
+
+err_clk_init:
+	if (cdns->num_clks)
+		clk_bulk_disable_unprepare(cdns->num_clks, cdns->clks);
+	return ret;
+}
+
+static void cdns3_clk_rst_deinit(struct cdns *cdns, bool clk_only)
+{
+	if (!clk_only)
+		reset_control_assert(cdns->resets);
+
+	if (cdns->num_clks)
+		clk_bulk_disable_unprepare(cdns->num_clks, cdns->clks);
+}
+
 /**
  * cdns3_plat_probe - probe for cdns3 core device
  * @pdev: Pointer to cdns3 core platform device
@@ -116,6 +152,16 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 		cdns->wakeup_irq = 0x0;
 	}
 
+	ret = devm_clk_bulk_get_all(dev, &cdns->clks);
+	if (ret < 0)
+		return ret;
+
+	cdns->num_clks = ret;
+
+	cdns->resets = devm_reset_control_array_get_optional_exclusive(dev);
+	if (IS_ERR(cdns->resets))
+		return PTR_ERR(cdns->resets);
+
 	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 	if (IS_ERR(cdns->usb2_phy))
 		return PTR_ERR(cdns->usb2_phy);
@@ -128,6 +174,10 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 	if (IS_ERR(cdns->usb3_phy))
 		return PTR_ERR(cdns->usb3_phy);
 
+	ret = cdns3_clk_rst_init(cdns, false);
+	if (ret)
+		return ret;
+
 	ret = phy_init(cdns->usb3_phy);
 	if (ret)
 		goto err_phy3_init;
@@ -165,6 +215,7 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 	phy_exit(cdns->usb3_phy);
 err_phy3_init:
 	phy_exit(cdns->usb2_phy);
+	cdns3_clk_rst_deinit(cdns, false);
 
 	return ret;
 }
@@ -187,6 +238,8 @@ static int cdns3_plat_remove(struct platform_device *pdev)
 	set_phy_power_off(cdns);
 	phy_exit(cdns->usb2_phy);
 	phy_exit(cdns->usb3_phy);
+	cdns3_clk_rst_deinit(cdns, false);
+
 	return 0;
 }
 
@@ -220,6 +273,8 @@ static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
 
 	cdns3_set_platform_suspend(cdns->dev, true, wakeup);
 	set_phy_power_off(cdns);
+	if (!PMSG_IS_AUTO(msg))
+		cdns3_clk_rst_deinit(cdns, true);
 	spin_lock_irqsave(&cdns->lock, flags);
 	cdns->in_lpm = true;
 	spin_unlock_irqrestore(&cdns->lock, flags);
@@ -237,6 +292,9 @@ static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
 	if (!cdns->in_lpm)
 		return 0;
 
+	if (!PMSG_IS_AUTO(msg))
+		cdns3_clk_rst_init(cdns, true);
+
 	if (cdns_power_is_lost(cdns)) {
 		phy_exit(cdns->usb2_phy);
 		ret = phy_init(cdns->usb2_phy);
diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
index 2d332a788871..b894768ee485 100644
--- a/drivers/usb/cdns3/core.h
+++ b/drivers/usb/cdns3/core.h
@@ -111,6 +111,9 @@ struct cdns {
 	struct mutex			mutex;
 	enum usb_dr_mode		dr_mode;
 	struct usb_role_switch		*role_sw;
+	struct reset_control *resets;
+	struct clk_bulk_data *clks;
+	int num_clks;
 	bool				in_lpm;
 	bool				wakeup_pending;
 	struct cdns3_platform_data	*pdata;
-- 
2.17.1