From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
Sebastian Reichel <sre@kernel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Hans de Goede <hdegoede@redhat.com>,
Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Heiko Stuebner <heiko@sntech.de>,
linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org,
linux-usb@v
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: [RFC v4 11/14] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree
Date: Thu, 09 Jun 2016 11:44:28 +0200 [thread overview]
Message-ID: <1465465471-28740-12-git-send-email-k.kozlowski@samsung.com> (raw)
In-Reply-To: <1465465471-28740-1-git-send-email-k.kozlowski@samsung.com>
Parse usb-pwrseq property from Device Tree to get the phandle to pwrseq
device. The pwrseq device will be used by USB hub to cycle the power
before activating ports.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
drivers/usb/core/hub.h | 3 +++
drivers/usb/core/port.c | 16 ++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 34c1a7e22aae..68ca89780d26 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -24,6 +24,8 @@
#include <linux/usb/hcd.h>
#include "usb.h"
+struct pwrseq;
+
struct usb_hub {
struct device *intfdev; /* the "interface" device */
struct usb_device *hdev;
@@ -101,6 +103,7 @@ struct usb_port {
struct usb_dev_state *port_owner;
struct usb_port *peer;
struct dev_pm_qos_request *req;
+ struct pwrseq *pwrseq;
enum usb_port_connect_type connect_type;
usb_port_location_t location;
struct mutex status_lock;
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 460c855be0d0..4fce0250179c 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -18,6 +18,8 @@
#include <linux/slab.h>
#include <linux/pm_qos.h>
+#include <linux/pwrseq.h>
+#include <linux/usb/of.h>
#include "hub.h"
@@ -526,6 +528,15 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
return retval;
}
+ port_dev->dev.of_node = usb_of_get_child_node(hdev->dev.parent->of_node,
+ port1);
+ port_dev->pwrseq = pwrseq_alloc(&port_dev->dev, "usb-pwrseq");
+ if (IS_ERR(port_dev->pwrseq)) {
+ retval = PTR_ERR(port_dev->pwrseq);
+ device_unregister(&port_dev->dev);
+ return retval;
+ }
+
find_and_link_peer(hub, port1);
/*
@@ -567,8 +578,13 @@ void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
struct usb_port *port_dev = hub->ports[port1 - 1];
struct usb_port *peer;
+ pwrseq_power_off(port_dev->pwrseq);
+
peer = port_dev->peer;
if (peer)
unlink_peers(port_dev, peer);
+
+ pwrseq_free(port_dev->pwrseq);
+ port_dev->pwrseq = NULL;
device_unregister(&port_dev->dev);
}
--
1.9.1
next prev parent reply other threads:[~2016-06-09 9:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 9:44 [RFC v4 00/14] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 01/14] regulator: of: Add helper for getting all supplies Krzysztof Kozlowski
2016-06-09 10:29 ` Mark Brown
2016-06-09 11:42 ` Krzysztof Kozlowski
2016-06-10 17:30 ` Rob Herring
2016-06-10 18:49 ` Heiko Stübner
2016-06-12 7:29 ` Peter Chen
2016-06-13 3:44 ` Peter Chen
2016-06-09 12:50 ` Rafael J. Wysocki
[not found] ` <CAJZ5v0hiyyOhU7AjOEjFHjTKhT+pqWZheUG77c6u2HV9dNQ0Gg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-09 15:57 ` Mark Brown
2016-06-09 9:44 ` [RFC v4 02/14] simplefb: Use new devm_of_regulator_all_get helper and bulk API Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 03/14] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 04/14] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 05/14] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski
[not found] ` <1465465471-28740-1-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-06-09 9:44 ` [RFC v4 06/14] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 07/14] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 08/14] power: pwrseq: simple: Add support for regulators and generic property Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 09/14] power: pwrseq: Add support for USB hubs with external power Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 10/14] usb: hub: Handle deferred probe Krzysztof Kozlowski
2016-06-09 9:44 ` Krzysztof Kozlowski [this message]
2016-06-09 9:44 ` [RFC v4 12/14] EXAMPLE CODE: usb: hub: Power sequence the ports on activation Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 13/14] ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 Krzysztof Kozlowski
2016-06-09 9:44 ` [RFC v4 14/14] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization " Krzysztof Kozlowski
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