From patchwork Fri Apr 25 11:21:13 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Gautam X-Patchwork-Id: 4059171 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A095B9F4DC for ; Fri, 25 Apr 2014 11:24:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4D18020397 for ; Fri, 25 Apr 2014 11:24:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D4D7F20398 for ; Fri, 25 Apr 2014 11:24:14 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WdeCS-0000Jd-1I; Fri, 25 Apr 2014 11:21:48 +0000 Received: from mail-pa0-x22e.google.com ([2607:f8b0:400e:c03::22e]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WdeCO-0007b7-3a for linux-arm-kernel@lists.infradead.org; Fri, 25 Apr 2014 11:21:45 +0000 Received: by mail-pa0-f46.google.com with SMTP id kp14so3034369pab.5 for ; Fri, 25 Apr 2014 04:21:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id; bh=lTBFdOGER993KJ7ALFPcYiF0dhqLsjM0Jf4ppgmqPxc=; b=GOhiyHiLa5SUP2aej7ZDsOy87hWZjGDmmL4SYUNDoYh9Zk9evkldyt/6bMX7UIUGzO o2Qd2ajFuxefoMxDigDJVv8CbrKG4+YvcchWPT3CSONhXbQz682PQ0Yp725oEI6dkVii 5DLwyXAGthb2VyKue4L9IlQOT8oWF3veUF2Y+Sm6vnBoa4ZPP/Cpuq5uRoNDVpT5+Hwv gg7AhpUfp2qnTKapU4nbM4/P/SclOZ35dj+HmobUiWJwl/RPY6hkT8dhjApzdpMvfhaI 6p/03pJcoRhamRZZtmQhboicXG3CeSAv2vUyxDe/YjqYPlfrduWs/H7ZOU42zEpReuuk sBxw== X-Received: by 10.66.141.12 with SMTP id rk12mr7043597pab.152.1398424883172; Fri, 25 Apr 2014 04:21:23 -0700 (PDT) Received: from vivek-linuxpc.sisodomain.com ([115.113.119.130]) by mx.google.com with ESMTPSA id xr9sm36842045pab.5.2014.04.25.04.21.19 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 25 Apr 2014 04:21:22 -0700 (PDT) From: Vivek Gautam To: linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v8 2/2] usb: ehci-exynos: Change to use phy provided by the generic phy framework Date: Fri, 25 Apr 2014 16:51:13 +0530 Message-Id: <1398424873-20257-1-git-send-email-gautam.vivek@samsung.com> X-Mailer: git-send-email 1.7.10.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140425_042144_233236_B6B14438 X-CRM114-Status: GOOD ( 22.03 ) X-Spam-Score: 0.2 (/) Cc: k.debski@samsung.com, kgene.kim@samsung.com, gregkh@linuxfoundation.org, jg1.han@samsung.com, linux-kernel@vger.kernel.org, balbi@ti.com, stern@rowland.harvard.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kamil Debski Add the phy provider, supplied by new Exynos-usb2phy using Generic phy framework. Keeping the support for older USB phy intact right now, in order to prevent any functionality break in absence of relevant device tree side change for ehci-exynos. Once we move to new phy in the device nodes for ehci, we can remove the support for older phys. Signed-off-by: Kamil Debski [gautam.vivek@samsung.com: Addressed review comments from mailing list] [gautam.vivek@samsung.com: Kept the code for old usb-phy, and just added support for new exynos5-usb2phy in generic phy framework] [gautam.vivek@samsung.com: Edited the commit message] Signed-off-by: Vivek Gautam --- Changes from v7: just edited in the commit message: s/ohci/ehci Although the patch-series is named as 'v2' version, but this patch is named as 'v7' since it is the next version of the patch sent by Kamil: [PATCH v6 8/8] usb: ehci-exynos: Change to use phy provided by the generic phy framework https://lkml.org/lkml/2014/1/29/298 Changes from v6: - Added documentation for 'port' property including all its fields - reg, phys, phy-names. - Fixed looping in 'exynos_phys_on()' and renamed this function as exynos_ehci_phyg_on() - To avoid any regression because of movement from old usb-phy drivers to new generic phy framework, keeping the changes for old usb-phy driver intact, and just added support for phy provider from generic phy framework. - Separated out the phy-get related code from probe() to separate function exynos_ehci_get_phy(). .../devicetree/bindings/usb/exynos-usb.txt | 18 +++ drivers/usb/host/ehci-exynos.c | 123 ++++++++++++++++++-- 2 files changed, 131 insertions(+), 10 deletions(-) diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt b/Documentation/devicetree/bindings/usb/exynos-usb.txt index 03b7e43..4f368b0 100644 --- a/Documentation/devicetree/bindings/usb/exynos-usb.txt +++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt @@ -12,6 +12,15 @@ Required properties: - interrupts: interrupt number to the cpu. - clocks: from common clock binding: handle to usb clock. - clock-names: from common clock binding: Shall be "usbhost". + - port: if in the SoC there are EHCI phys, they should be listed here. + One phy per port. Each port should have its 'reg' entry. + - reg: port number on EHCI controller, e.g + On Exynos5250, port 0 is USB2.0 otg phy + port 1 is HSIC phy0 + port 2 is HSIC phy1 + - phys: from the *Generic PHY* bindings; specifying phy used by port. + - phy-names: from the *Generic PHY* bindings; specifying name of phy + used by the port. Optional properties: - samsung,vbus-gpio: if present, specifies the GPIO that @@ -27,6 +36,15 @@ Example: clocks = <&clock 285>; clock-names = "usbhost"; + + #address-cells = <1>; + #size-cells = <0>; + port@0 { + reg = <0>; + phys = <&usb2phy 1>; + phy-names = "host"; + status = "disabled"; + }; }; OHCI diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c index 7f425ac..fe0509b 100644 --- a/drivers/usb/host/ehci-exynos.c +++ b/drivers/usb/host/ehci-exynos.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -42,14 +43,78 @@ static const char hcd_name[] = "ehci-exynos"; static struct hc_driver __read_mostly exynos_ehci_hc_driver; +#define PHY_NUMBER 3 struct exynos_ehci_hcd { struct clk *clk; struct usb_phy *phy; struct usb_otg *otg; + struct phy *phy_g[PHY_NUMBER]; }; #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv) +static int exynos_ehci_get_phy(struct platform_device *pdev, + struct exynos_ehci_hcd *exynos_ehci) +{ + struct device_node *child; + struct phy *phy; + int phy_number; + int ret = 0; + + exynos_ehci->phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); + if (IS_ERR(exynos_ehci->phy)) { + ret = PTR_ERR(exynos_ehci->phy); + /* This is the case when PHY config is disabled */ + if (ret == -ENXIO || ret == -ENODEV) { + dev_dbg(&pdev->dev, "Failed to get usb2 phy\n"); + exynos_ehci->phy = NULL; + ret = 0; + } else if (ret == -EPROBE_DEFER) { + goto fail_phy; + } else { + dev_err(&pdev->dev, "no usb2 phy configured\n"); + goto fail_phy; + } + } else { + exynos_ehci->otg = exynos_ehci->phy->otg; + } + + for_each_available_child_of_node(pdev->dev.of_node, child) { + ret = of_property_read_u32(child, "reg", &phy_number); + if (ret) { + dev_err(&pdev->dev, "Failed to parse device tree\n"); + of_node_put(child); + goto fail_phy; + } + if (phy_number >= PHY_NUMBER) { + dev_err(&pdev->dev, "Invalid number of PHYs\n"); + of_node_put(child); + ret = -EINVAL; + goto fail_phy; + } + phy = devm_of_phy_get(&pdev->dev, child, 0); + of_node_put(child); + if (IS_ERR(phy)) { + ret = PTR_ERR(phy); + /* This is the case when PHY config is disabled */ + if (ret == -ENOSYS || ret == -ENODEV) { + dev_dbg(&pdev->dev, "Failed to get usb2 phy\n"); + phy = NULL; + ret = 0; + } else if (ret == -EPROBE_DEFER) { + goto fail_phy; + } else { + dev_err(&pdev->dev, "no usb2 phy configured\n"); + goto fail_phy; + } + } + exynos_ehci->phy_g[phy_number] = phy; + } + +fail_phy: + return ret; +} + static void exynos_setup_vbus_gpio(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -69,13 +134,40 @@ static void exynos_setup_vbus_gpio(struct platform_device *pdev) dev_err(dev, "can't request ehci vbus gpio %d", gpio); } +static int exynos_ehci_phyg_on(struct phy *phy[]) +{ + int i; + int ret = 0; + + for (i = 0; ret == 0 && i < PHY_NUMBER; i++) + if (phy[i]) + ret = phy_power_on(phy[i]); + if (ret) + for (i--; i > 0; i--) + if (phy[i]) + phy_power_off(phy[i]); + + return ret; +} + +static int exynos_ehci_phyg_off(struct phy *phy[]) +{ + int i; + int ret = 0; + + for (i = 0; ret == 0 && i < PHY_NUMBER; i++) + if (phy[i]) + ret = phy_power_off(phy[i]); + + return ret; +} + static int exynos_ehci_probe(struct platform_device *pdev) { struct exynos_ehci_hcd *exynos_ehci; struct usb_hcd *hcd; struct ehci_hcd *ehci; struct resource *res; - struct usb_phy *phy; int irq; int err; @@ -102,15 +194,9 @@ static int exynos_ehci_probe(struct platform_device *pdev) "samsung,exynos5440-ehci")) goto skip_phy; - phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); - if (IS_ERR(phy)) { - usb_put_hcd(hcd); - dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); - return -EPROBE_DEFER; - } else { - exynos_ehci->phy = phy; - exynos_ehci->otg = phy->otg; - } + err = exynos_ehci_get_phy(pdev, exynos_ehci); + if (err) + goto fail_clk; skip_phy: @@ -155,6 +241,14 @@ skip_phy: if (exynos_ehci->phy) usb_phy_init(exynos_ehci->phy); + if (exynos_ehci->phy_g) { + err = exynos_ehci_phyg_on(exynos_ehci->phy_g); + if (err) { + dev_err(&pdev->dev, "Failed to enable phys\n"); + goto fail_io; + } + } + ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; @@ -175,6 +269,7 @@ skip_phy: fail_add_hcd: if (exynos_ehci->phy) usb_phy_shutdown(exynos_ehci->phy); + exynos_ehci_phyg_off(exynos_ehci->phy_g); fail_io: clk_disable_unprepare(exynos_ehci->clk); fail_clk: @@ -195,6 +290,8 @@ static int exynos_ehci_remove(struct platform_device *pdev) if (exynos_ehci->phy) usb_phy_shutdown(exynos_ehci->phy); + exynos_ehci_phyg_off(exynos_ehci->phy_g); + clk_disable_unprepare(exynos_ehci->clk); usb_put_hcd(hcd); @@ -221,6 +318,9 @@ static int exynos_ehci_suspend(struct device *dev) if (exynos_ehci->phy) usb_phy_shutdown(exynos_ehci->phy); + if (exynos_ehci->phy_g) + exynos_ehci_phyg_off(exynos_ehci->phy_g); + clk_disable_unprepare(exynos_ehci->clk); return rc; @@ -239,6 +339,9 @@ static int exynos_ehci_resume(struct device *dev) if (exynos_ehci->phy) usb_phy_init(exynos_ehci->phy); + if (exynos_ehci->phy_g) + exynos_ehci_phyg_on(exynos_ehci->phy_g); + /* DMA burst Enable */ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));