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Groups > linux.kernel > #1395075
| From | Krzysztof Kozlowski <k.kozlowski@samsung.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC v2 09/13] power: pwrseq: Add support for USB hubs with external power |
| Date | 2016-05-05 14:40 +0200 |
| Message-ID | <rvqJs-8s0-17@gated-at.bofh.it> (permalink) |
| References | <rvqJr-8s0-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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 | 44 +++++++++++++++++++++++++++++++++++++++++++
include/linux/pwrseq.h | 8 ++++++++
2 files changed, 52 insertions(+)
diff --git a/drivers/power/pwrseq/pwrseq.c b/drivers/power/pwrseq/pwrseq.c
index 495a19d3c30b..306265f55a10 100644
--- a/drivers/power/pwrseq/pwrseq.c
+++ b/drivers/power/pwrseq/pwrseq.c
@@ -52,6 +52,43 @@ int mmc_pwrseq_alloc(struct mmc_host *host)
}
EXPORT_SYMBOL_GPL(mmc_pwrseq_alloc);
+struct pwrseq *pwrseq_alloc(struct device *dev)
+{
+ struct device_node *np;
+ struct pwrseq *p, *ret = NULL;
+
+ np = of_parse_phandle(dev->of_node, "usb-pwrseq", 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);
+
+ /* FIXME: this path can be simplified... */
+ if (!ret) {
+ dev_info(dev, "usb-pwrseq defer\n");
+ 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 +121,13 @@ 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..c3c91f50e4cb 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);
+void pwrseq_free(const struct pwrseq *pwrseq);
+
#else /* CONFIG_POWER_SEQ */
static inline int pwrseq_register(struct pwrseq *pwrseq)
@@ -44,9 +48,13 @@ 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) { return NULL; }
+static inline void pwrseq_free(const struct pwrseq *pwrseq) {}
+
#endif /* CONFIG_POWER_SEQ */
#endif /* _LINUX_PWRSEQ_H */
--
1.9.1
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[RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
[RFC v2 03/13] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 03/13] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 20:50 +0200
[RFC v2 08/13] usb: hub: Handle deferred probe Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
[RFC v2 09/13] power: pwrseq: Add support for USB hubs with external power Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 09/13] power: pwrseq: Add support for USB hubs with external power Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 22:00 +0200
Re: [RFC v2 09/13] power: pwrseq: Add support for USB hubs with external power Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:30 +0200
[RFC v2 10/13] usb: hub: Power sequence the ports on activation Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 10/13] usb: hub: Power sequence the ports on activation Alan Stern <stern@rowland.harvard.edu> - 2016-05-05 16:20 +0200
Re: [RFC v2 10/13] usb: hub: Power sequence the ports on activation Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 19:40 +0200
Re: [RFC v2 10/13] usb: hub: Power sequence the ports on activation Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 22:00 +0200
[RFC v2 04/13] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 04/13] power: pwrseq: Enable COMPILE_TEST for drivers Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 21:00 +0200
[RFC v2 06/13] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 06/13] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 21:20 +0200
[RFC v2 12/13] ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
[RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 22:20 +0200
Re: [RFC v2 11/13] usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:30 +0200
[RFC v2 13/13] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization on Odroid U3 Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 13/13] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization on Odroid U3 Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 22:20 +0200
Re: [RFC v2 13/13] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization on Odroid U3 Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:30 +0200
[RFC v2 05/13] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 05/13] power: pwrseq: Remove mmc prefix from mmc_pwrseq Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 21:20 +0200
Re: [RFC v2 05/13] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:30 +0200
[RFC v2 07/13] power: pwrseq: simple: Add support for toggling regulator Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:40 +0200
Re: [RFC v2 07/13] power: pwrseq: simple: Add support for toggling regulator Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 21:40 +0200
Re: [RFC v2 07/13] power: pwrseq: simple: Add support for toggling regulator Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:30 +0200
[RFC v2 02/13] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-05 14:50 +0200
Re: [RFC v2 02/13] power/mmc: Move pwrseq drivers to power/pwrseq Javier Martinez Canillas <javier@osg.samsung.com> - 2016-05-05 20:50 +0200
Re: [RFC v2 02/13] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:20 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Rob Herring <robh@kernel.org> - 2016-05-06 00:50 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Peter Chen <hzpeterchen@gmail.com> - 2016-05-06 08:00 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:20 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Peter Chen <hzpeterchen@gmail.com> - 2016-05-06 09:30 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-05-06 08:20 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Rob Herring <robh@kernel.org> - 2016-05-06 15:10 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Ulf Hansson <ulf.hansson@linaro.org> - 2016-05-09 09:50 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Rob Herring <robh@kernel.org> - 2016-05-09 20:20 +0200
Re: [RFC v2 00/13] usb/mmc/power: Fix USB/LAN when TFTP booting Ulf Hansson <ulf.hansson@linaro.org> - 2016-05-10 13:10 +0200
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