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From: Biju Das <biju.das.jz@bp.renesas.com>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Biju Das <biju.das.jz@bp.renesas.com>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Fabrizio Castro <fabrizio.castro.jz@renesas.com>,
	linux-renesas-soc@vger.kernel.org
Subject: [PATCH v3 08/12] usb: host: xhci-plat: Add reset support
Date: Sat, 21 Jan 2023 14:58:49 +0000	[thread overview]
Message-ID: <20230121145853.4792-9-biju.das.jz@bp.renesas.com> (raw)
In-Reply-To: <20230121145853.4792-1-biju.das.jz@bp.renesas.com>

Add optional reset support. This is in preparation to adding USB xHCI
support for RZ/V2M SoC.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2->v3:
 * No change
v1->v2:
 * Added Rb tag from Geert.
---
 drivers/usb/host/xhci-plat.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 11b3a0d6722d..c5fc175a5fd1 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <linux/usb/of.h>
+#include <linux/reset.h>
 
 #include "xhci.h"
 #include "xhci-plat.h"
@@ -263,10 +264,20 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		goto put_hcd;
 	}
 
-	ret = clk_prepare_enable(xhci->reg_clk);
+	xhci->reset = devm_reset_control_array_get_optional_shared(&pdev->dev);
+	if (IS_ERR(xhci->reset)) {
+		ret = PTR_ERR(xhci->reset);
+		goto put_hcd;
+	}
+
+	ret = reset_control_deassert(xhci->reset);
 	if (ret)
 		goto put_hcd;
 
+	ret = clk_prepare_enable(xhci->reg_clk);
+	if (ret)
+		goto err_reset;
+
 	ret = clk_prepare_enable(xhci->clk);
 	if (ret)
 		goto disable_reg_clk;
@@ -377,6 +388,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
 disable_reg_clk:
 	clk_disable_unprepare(xhci->reg_clk);
 
+err_reset:
+	reset_control_assert(xhci->reset);
+
 put_hcd:
 	usb_put_hcd(hcd);
 
@@ -412,6 +426,7 @@ static int xhci_plat_remove(struct platform_device *dev)
 
 	clk_disable_unprepare(clk);
 	clk_disable_unprepare(reg_clk);
+	reset_control_assert(xhci->reset);
 	usb_put_hcd(hcd);
 
 	pm_runtime_disable(&dev->dev);
-- 
2.25.1


  parent reply	other threads:[~2023-01-21 14:59 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-21 14:58 [PATCH v3 00/12] ADD USB3.1 HOST, Peri and DRD support Biju Das
2023-01-21 14:58 ` [PATCH v3 01/12] dt-bindings: usb: renesas,usb-xhci: Document RZ/V2M support Biju Das
2023-01-21 14:58 ` [PATCH v3 02/12] dt-bindings: usb: renesas,usb3-peri: Update reset, clock-name and interrupts properties Biju Das
2023-01-21 14:58 ` [PATCH v3 03/12] dt-bindings: usb: renesas,usb3-peri: Document RZ/V2MA bindings Biju Das
2023-01-21 14:58 ` [PATCH v3 04/12] dt-bindings: usb: Add RZ/V2M USB3DRD binding Biju Das
2023-01-21 14:58 ` [PATCH v3 05/12] usb: gadget: Add support for RZ/V2M USB3DRD driver Biju Das
2023-01-21 14:58 ` [PATCH v3 06/12] usb: gadget: udc: renesas_usb3: Add role switch support for RZ/V2M Biju Das
2023-01-21 14:58 ` [PATCH v3 07/12] usb: host: xhci-plat: Improve clock handling in probe() Biju Das
2023-01-21 14:58 ` Biju Das [this message]
2023-01-21 14:58 ` [PATCH v3 09/12] xhci: host: Add Renesas RZ/V2M SoC support Biju Das
2023-01-21 14:58 ` [PATCH v3 10/12] arm64: dts: renesas: r9a09g011: Add USB3 DRD, device and host nodes Biju Das
2023-02-14 15:18   ` Geert Uytterhoeven
2023-01-21 14:58 ` [PATCH v3 11/12] arm64: dts: renesas: rzv2mevk2: Enable USB3 DRD, Peripheral and Host Biju Das
2023-02-14 15:18   ` Geert Uytterhoeven
2023-01-21 14:58 ` [PATCH v3 12/12] arm64: dts: renesas: rzv2mevk2: Enable USB3 role switch Biju Das
2023-02-14 15:18   ` Geert Uytterhoeven

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