From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
To: hzpeterchen@gmail.com, Ulf Hansson <ulf.hansson@linaro.org>,
Sebastian Reichel <sre@kernel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
Javier Martinez Canillas <javier@osg.samsung.com>,
linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-pm@vger.kernel.or, Alan Stern <stern@rowland.harvard.edu>,
linux-usb@vger.kernel.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>, Kukjin Kim <kgene@kernel.org>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: [PATCH v3 07/12] power: pwrseq: Add support for USB hubs with external power
Date: Wed, 01 Jun 2016 10:02:16 +0200 [thread overview]
Message-ID: <1464768141-25420-8-git-send-email-k.kozlowski@samsung.com> (raw)
In-Reply-To: <1464768141-25420-1-git-send-email-k.kozlowski@samsung.com>
Some USB devices on embedded boards have external power supply which has
to be reset in certain conditions. Add pwrseq interface for this.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
drivers/power/pwrseq/pwrseq.c | 47 ++++++++++++++++++++++++++++++++++++++++++-
include/linux/pwrseq.h | 11 ++++++++++
2 files changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/power/pwrseq/pwrseq.c b/drivers/power/pwrseq/pwrseq.c
index 495a19d3c30b..722aff4f740f 100644
--- a/drivers/power/pwrseq/pwrseq.c
+++ b/drivers/power/pwrseq/pwrseq.c
@@ -1,7 +1,9 @@
/*
- * Copyright (C) 2014 Linaro Ltd
+ * Copyright (C) 2014 Linaro Ltd
+ * Copyright (C) 2016 Samsung Electronics
*
* Author: Ulf Hansson <ulf.hansson@linaro.org>
+ * Krzysztof Kozlowski <k.kozlowski@samsung.com>
*
* License terms: GNU General Public License (GPL) version 2
*
@@ -52,6 +54,42 @@ int mmc_pwrseq_alloc(struct mmc_host *host)
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_alloc);
+struct pwrseq *pwrseq_alloc(struct device *dev, const char *phandle_name)
+{
+ struct device_node *np;
+ struct pwrseq *p, *ret = NULL;
+
+ np = of_parse_phandle(dev->of_node, phandle_name, 0);
+ if (!np)
+ return NULL;
+
+ mutex_lock(&pwrseq_list_mutex);
+ list_for_each_entry(p, &pwrseq_list, pwrseq_node) {
+ if (p->dev->of_node == np) {
+ if (!try_module_get(p->owner))
+ dev_err(dev,
+ "increasing module refcount failed\n");
+ else
+ ret = p;
+
+ break;
+ }
+ }
+
+ of_node_put(np);
+ mutex_unlock(&pwrseq_list_mutex);
+
+ if (!ret) {
+ dev_dbg(dev, "%s defer probe\n", phandle_name);
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ dev_info(dev, "allocated usb-pwrseq\n");
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pwrseq_alloc);
+
void pwrseq_pre_power_on(struct pwrseq *pwrseq)
{
if (pwrseq && pwrseq->ops->pre_power_on)
@@ -84,6 +122,13 @@ void mmc_pwrseq_free(struct mmc_host *host)
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_free);
+void pwrseq_free(const struct pwrseq *pwrseq)
+{
+ if (pwrseq)
+ module_put(pwrseq->owner);
+}
+EXPORT_SYMBOL_GPL(pwrseq_free);
+
int pwrseq_register(struct pwrseq *pwrseq)
{
if (!pwrseq || !pwrseq->ops || !pwrseq->dev)
diff --git a/include/linux/pwrseq.h b/include/linux/pwrseq.h
index fcc8fd855d4c..6215b3d6350d 100644
--- a/include/linux/pwrseq.h
+++ b/include/linux/pwrseq.h
@@ -31,9 +31,13 @@ void pwrseq_unregister(struct pwrseq *pwrseq);
void pwrseq_pre_power_on(struct pwrseq *pwrseq);
void pwrseq_post_power_on(struct pwrseq *pwrseq);
void pwrseq_power_off(struct pwrseq *pwrseq);
+
int mmc_pwrseq_alloc(struct mmc_host *host);
void mmc_pwrseq_free(struct mmc_host *host);
+struct pwrseq *pwrseq_alloc(struct device *dev, const char *phandle_name);
+void pwrseq_free(const struct pwrseq *pwrseq);
+
#else /* CONFIG_POWER_SEQ */
static inline int pwrseq_register(struct pwrseq *pwrseq)
@@ -44,9 +48,16 @@ static inline void pwrseq_unregister(struct pwrseq *pwrseq) {}
static inline void pwrseq_pre_power_on(struct pwrseq *pwrseq) {}
static inline void pwrseq_post_power_on(struct pwrseq *pwrseq) {}
static inline void pwrseq_power_off(struct pwrseq *pwrseq) {}
+
static inline int mmc_pwrseq_alloc(struct mmc_host *host) { return 0; }
static inline void mmc_pwrseq_free(struct mmc_host *host) {}
+static inline struct pwrseq *pwrseq_alloc(struct device *dev, const char *phandle_name)
+{
+ return NULL;
+}
+static inline void pwrseq_free(const struct pwrseq *pwrseq) {}
+
#endif /* CONFIG_POWER_SEQ */
#endif /* _LINUX_PWRSEQ_H */
--
1.9.1
next prev parent reply other threads:[~2016-06-01 8:03 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 8:02 [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 01/12] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 02/12] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 03/12] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 04/12] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 05/12] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator and generic property Krzysztof Kozlowski
2016-06-03 2:02 ` Rob Herring
2016-06-03 12:35 ` Krzysztof Kozlowski
2016-06-06 3:22 ` Peter Chen
2016-06-07 9:29 ` Krzysztof Kozlowski
2016-06-08 19:03 ` Rob Herring
2016-06-09 2:34 ` Chen-Yu Tsai
2016-06-09 5:11 ` Krzysztof Kozlowski
2016-06-01 8:02 ` Krzysztof Kozlowski [this message]
2016-06-01 8:02 ` [PATCH v3 08/12] usb: hub: Handle deferred probe Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski
2016-06-01 8:57 ` Stephen Boyd
2016-06-01 9:06 ` Krzysztof Kozlowski
2016-06-01 12:05 ` Peter Chen
2016-06-01 18:16 ` Stephen Boyd
2016-06-02 1:24 ` Peter Chen
2016-06-01 8:02 ` [PATCH v3 10/12] EXAMPLE CODE: usb: hub: Power sequence the ports on activation Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 11/12] ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 12/12] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization " Krzysztof Kozlowski
2016-06-01 11:59 ` Peter Chen
2016-06-02 7:26 ` Krzysztof Kozlowski
2016-06-02 7:58 ` Peter Chen
2016-06-06 20:43 ` [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Heiko Stübner
2016-06-07 6:03 ` Krzysztof Kozlowski
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