From patchwork Fri May 29 06:00:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Looijmans X-Patchwork-Id: 11577769 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2B589139A for ; Fri, 29 May 2020 06:02:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1279A212CC for ; Fri, 29 May 2020 06:02:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725817AbgE2GCF (ORCPT ); Fri, 29 May 2020 02:02:05 -0400 Received: from atl4mhfb04.myregisteredsite.com ([209.17.115.120]:47192 "EHLO atl4mhfb04.myregisteredsite.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725355AbgE2GCF (ORCPT ); Fri, 29 May 2020 02:02:05 -0400 Received: from jax4mhob20.registeredsite.com (jax4mhob20.registeredsite.com [64.69.218.108]) by atl4mhfb04.myregisteredsite.com (8.14.4/8.14.4) with ESMTP id 04T623Un001693 for ; Fri, 29 May 2020 02:02:03 -0400 Received: from mailpod.hostingplatform.com ([10.30.71.203]) by jax4mhob20.registeredsite.com (8.14.4/8.14.4) with ESMTP id 04T61wOf003354 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Fri, 29 May 2020 02:01:58 -0400 Received: (qmail 1573 invoked by uid 0); 29 May 2020 06:01:58 -0000 X-TCPREMOTEIP: 83.128.90.119 X-Authenticated-UID: mike@milosoftware.com Received: from unknown (HELO phenom.domain?not?set.invalid) (mike@milosoftware.com@83.128.90.119) by 0 with ESMTPA; 29 May 2020 06:01:58 -0000 From: Mike Looijmans To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, robh+dt@kernel.org, balbi@kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Looijmans Subject: [PATCH v2] usb/phy-generic: Add support for OTG VBUS supply control Date: Fri, 29 May 2020 08:00:45 +0200 Message-Id: <20200529060045.25556-1-mike.looijmans@topic.nl> X-Mailer: git-send-email 2.17.1 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This enables support for VBUS on boards where the power is supplied by a regulator. The regulator is enabled when the USB port enters HOST mode. Signed-off-by: Mike Looijmans --- v2: Added missing "return 0;" in set_vbus method .../devicetree/bindings/usb/usb-nop-xceiv.txt | 3 ++ drivers/usb/phy/phy-generic.c | 46 ++++++++++++++++++- drivers/usb/phy/phy-generic.h | 2 + 3 files changed, 50 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt index 4dc6a8ee3071..775a19fdb613 100644 --- a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt +++ b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt @@ -16,6 +16,9 @@ Optional properties: - vcc-supply: phandle to the regulator that provides power to the PHY. +- vbus-supply: phandle to the regulator that provides the VBUS power for when + the device is in HOST mode. + - reset-gpios: Should specify the GPIO for reset. - vbus-detect-gpio: should specify the GPIO detecting a VBus insertion diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c index 661a229c105d..69bf39510e27 100644 --- a/drivers/usb/phy/phy-generic.c +++ b/drivers/usb/phy/phy-generic.c @@ -203,13 +203,45 @@ static int nop_set_host(struct usb_otg *otg, struct usb_bus *host) return 0; } +static int nop_set_vbus(struct usb_otg *otg, bool enabled) +{ + struct usb_phy_generic *nop; + int ret; + + if (!otg) + return -ENODEV; + + nop = container_of(otg->usb_phy, struct usb_phy_generic, phy); + + if (!nop->vbus_reg) + return 0; + + if (enabled) { + if (nop->vbus_reg_enabled) + return 0; + ret = regulator_enable(nop->vbus_reg); + if (ret < 0) + return ret; + nop->vbus_reg_enabled = true; + } else { + if (!nop->vbus_reg_enabled) + return 0; + ret = regulator_disable(nop->vbus_reg); + if (ret < 0) + return ret; + nop->vbus_reg_enabled = false; + } + + return 0; +} + int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop) { enum usb_phy_type type = USB_PHY_TYPE_USB2; int err = 0; u32 clk_rate = 0; - bool needs_vcc = false, needs_clk = false; + bool needs_vcc = false, needs_clk = false, needs_vbus = false; if (dev->of_node) { struct device_node *node = dev->of_node; @@ -219,6 +251,7 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop) needs_vcc = of_property_read_bool(node, "vcc-supply"); needs_clk = of_property_read_bool(node, "clocks"); + needs_vbus = of_property_read_bool(node, "vbus-supply"); } nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS); @@ -268,6 +301,16 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop) return -EPROBE_DEFER; } + nop->vbus_reg = devm_regulator_get(dev, "vbus"); + if (IS_ERR(nop->vbus_reg)) { + dev_dbg(dev, "Error getting vbus regulator: %ld\n", + PTR_ERR(nop->vbus_reg)); + if (needs_vbus) + return -EPROBE_DEFER; + + nop->vbus_reg = NULL; + } + nop->dev = dev; nop->phy.dev = nop->dev; nop->phy.label = "nop-xceiv"; @@ -278,6 +321,7 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop) nop->phy.otg->usb_phy = &nop->phy; nop->phy.otg->set_host = nop_set_host; nop->phy.otg->set_peripheral = nop_set_peripheral; + nop->phy.otg->set_vbus = nop_set_vbus; return 0; } diff --git a/drivers/usb/phy/phy-generic.h b/drivers/usb/phy/phy-generic.h index 7ee80211a688..a3663639ea1e 100644 --- a/drivers/usb/phy/phy-generic.h +++ b/drivers/usb/phy/phy-generic.h @@ -14,7 +14,9 @@ struct usb_phy_generic { struct gpio_desc *gpiod_reset; struct gpio_desc *gpiod_vbus; struct regulator *vbus_draw; + struct regulator *vbus_reg; bool vbus_draw_enabled; + bool vbus_reg_enabled; unsigned long mA; unsigned int vbus; };