diff options
Diffstat (limited to '0009-power-add-power-sequence-library.patch')
| -rw-r--r-- | 0009-power-add-power-sequence-library.patch | 790 |
1 files changed, 0 insertions, 790 deletions
diff --git a/0009-power-add-power-sequence-library.patch b/0009-power-add-power-sequence-library.patch deleted file mode 100644 index c0da023cae3c..000000000000 --- a/0009-power-add-power-sequence-library.patch +++ /dev/null @@ -1,790 +0,0 @@ -From 4ddcbb9ed40c97371724245d0b8d01d471bb6570 Mon Sep 17 00:00:00 2001 -From: Peter Chen <peter.chen@nxp.com> -Date: Wed, 21 Jun 2017 14:42:03 +0800 -Subject: [PATCH 09/14] power: add power sequence library - -We have an well-known problem that the device needs to do some power -sequence before it can be recognized by related host, the typical -example like hard-wired mmc devices and usb devices. - -This power sequence is hard to be described at device tree and handled by -related host driver, so we have created a common power sequence -library to cover this requirement. The core code has supplied -some common helpers for host driver, and individual power sequence -libraries handle kinds of power sequence for devices. The pwrseq -librares always need to allocate extra instance for compatible -string match. - -pwrseq_generic is intended for general purpose of power sequence, which -handles gpios and clocks currently, and can cover other controls in -future. The host driver just needs to call of_pwrseq_on/of_pwrseq_off -if only one power sequence is needed, else call of_pwrseq_on_list -/of_pwrseq_off_list instead (eg, USB hub driver). - -For new power sequence library, it needs to add its compatible string -and allocation function at pwrseq_match_table_list, then the pwrseq -core will match it with DT's, and choose this library at runtime. - -Signed-off-by: Peter Chen <peter.chen@nxp.com> -Tested-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> -Tested-by Joshua Clayton <stillcompiling@gmail.com> -Reviewed-by: Matthias Kaehlcke <mka@chromium.org> -Tested-by: Matthias Kaehlcke <mka@chromium.org> ---- - Documentation/power/power-sequence/design.rst | 54 ++++ - MAINTAINERS | 9 + - drivers/power/Kconfig | 1 + - drivers/power/Makefile | 1 + - drivers/power/pwrseq/Kconfig | 20 ++ - drivers/power/pwrseq/Makefile | 2 + - drivers/power/pwrseq/core.c | 293 ++++++++++++++++++ - drivers/power/pwrseq/pwrseq_generic.c | 210 +++++++++++++ - include/linux/power/pwrseq.h | 84 +++++ - 9 files changed, 674 insertions(+) - create mode 100644 Documentation/power/power-sequence/design.rst - create mode 100644 drivers/power/pwrseq/Kconfig - create mode 100644 drivers/power/pwrseq/Makefile - create mode 100644 drivers/power/pwrseq/core.c - create mode 100644 drivers/power/pwrseq/pwrseq_generic.c - create mode 100644 include/linux/power/pwrseq.h - -diff --git a/Documentation/power/power-sequence/design.rst b/Documentation/power/power-sequence/design.rst -new file mode 100644 -index 000000000000..554608e5f3b6 ---- /dev/null -+++ b/Documentation/power/power-sequence/design.rst -@@ -0,0 +1,54 @@ -+==================================== -+Power Sequence Library -+==================================== -+ -+:Date: Feb, 2017 -+:Author: Peter Chen <peter.chen@nxp.com> -+ -+ -+Introduction -+============ -+ -+We have an well-known problem that the device needs to do a power -+sequence before it can be recognized by related host, the typical -+examples are hard-wired mmc devices and usb devices. The host controller -+can't know what kinds of this device is in its bus if the power -+sequence has not done, since the related devices driver's probe calling -+is determined by runtime according to eunumeration results. Besides, -+the devices may have custom power sequence, so the power sequence library -+which is independent with the devices is needed. -+ -+Design -+============ -+ -+The power sequence library includes the core file and customer power -+sequence library. The core file exports interfaces are called by -+host controller driver for power sequence and customer power sequence -+library files to register its power sequence instance to global -+power sequence list. The custom power sequence library creates power -+sequence instance and implement custom power sequence. -+ -+Since the power sequence describes hardware design, the description is -+located at board description file, eg, device tree dts file. And -+a specific power sequence belongs to device, so its description -+is under the device node, please refer to: -+Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt -+ -+Custom power sequence library allocates one power sequence instance at -+bootup periods using postcore_initcall, this static allocated instance is -+used to compare with device-tree (DT) node to see if this library can be -+used for the node or not. When the result is matched, the core API will -+try to get resourses (->get, implemented at each library) for power -+sequence, if all resources are got, it will try to allocate another -+instance for next possible request from host driver. -+ -+Then, the host controller driver can carry out power sequence on for this -+DT node, the library will do corresponding operations, like open clocks, -+toggle gpio, etc. The power sequence off routine will close and free the -+resources, and is called when the parent is removed. And the power -+sequence suspend and resume routine can be called at host driver's -+suspend and resume routine if needed. -+ -+The exported interfaces -+.. kernel-doc:: drivers/power/pwrseq/core.c -+ :export: -diff --git a/MAINTAINERS b/MAINTAINERS -index 96e98e206b0d..99339375209c 100644 ---- a/MAINTAINERS -+++ b/MAINTAINERS -@@ -11398,6 +11398,15 @@ F: drivers/firmware/psci*.c - F: include/linux/psci.h - F: include/uapi/linux/psci.h - -+POWER SEQUENCE LIBRARY -+M: Peter Chen <Peter.Chen@nxp.com> -+T: git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git -+L: linux-pm@vger.kernel.org -+S: Maintained -+F: Documentation/devicetree/bindings/power/pwrseq/ -+F: drivers/power/pwrseq/ -+F: include/linux/power/pwrseq.h -+ - POWER SUPPLY CLASS/SUBSYSTEM and DRIVERS - M: Sebastian Reichel <sre@kernel.org> - L: linux-pm@vger.kernel.org -diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig -index 63454b5cac27..c1bb0465f956 100644 ---- a/drivers/power/Kconfig -+++ b/drivers/power/Kconfig -@@ -1,3 +1,4 @@ - source "drivers/power/avs/Kconfig" - source "drivers/power/reset/Kconfig" - source "drivers/power/supply/Kconfig" -+source "drivers/power/pwrseq/Kconfig" -diff --git a/drivers/power/Makefile b/drivers/power/Makefile -index ff35c712d824..7db80354b691 100644 ---- a/drivers/power/Makefile -+++ b/drivers/power/Makefile -@@ -1,3 +1,4 @@ - obj-$(CONFIG_POWER_AVS) += avs/ - obj-$(CONFIG_POWER_RESET) += reset/ - obj-$(CONFIG_POWER_SUPPLY) += supply/ -+obj-$(CONFIG_POWER_SEQUENCE) += pwrseq/ -diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig -new file mode 100644 -index 000000000000..c6b356926cca ---- /dev/null -+++ b/drivers/power/pwrseq/Kconfig -@@ -0,0 +1,20 @@ -+# -+# Power Sequence library -+# -+ -+menuconfig POWER_SEQUENCE -+ bool "Power sequence control" -+ help -+ It is used for drivers which needs to do power sequence -+ (eg, turn on clock, toggle reset gpio) before the related -+ devices can be found by hardware, eg, USB bus. -+ -+if POWER_SEQUENCE -+ -+config PWRSEQ_GENERIC -+ bool "Generic power sequence control" -+ depends on OF -+ help -+ This is the generic power sequence control library, and is -+ supposed to support common power sequence usage. -+endif -diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile -new file mode 100644 -index 000000000000..ad82389028c2 ---- /dev/null -+++ b/drivers/power/pwrseq/Makefile -@@ -0,0 +1,2 @@ -+obj-$(CONFIG_POWER_SEQUENCE) += core.o -+obj-$(CONFIG_PWRSEQ_GENERIC) += pwrseq_generic.o -diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c -new file mode 100644 -index 000000000000..6b78a6691683 ---- /dev/null -+++ b/drivers/power/pwrseq/core.c -@@ -0,0 +1,293 @@ -+/* -+ * core.c power sequence core file -+ * -+ * Copyright (C) 2016 Freescale Semiconductor, Inc. -+ * Author: Peter Chen <peter.chen@nxp.com> -+ * -+ * This program is free software: you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 of -+ * the License as published by the Free Software Foundation. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. -+ */ -+ -+#include <linux/list.h> -+#include <linux/mutex.h> -+#include <linux/of.h> -+#include <linux/slab.h> -+#include <linux/power/pwrseq.h> -+ -+/* -+ * Static power sequence match table -+ * - Add compatible (the same with dts node) and related allocation function. -+ * - Update related binding doc. -+ */ -+static const struct of_device_id pwrseq_match_table_list[] = { -+ { .compatible = "usb424,2513", .data = &pwrseq_generic_alloc_instance}, -+ { .compatible = "usb424,2514", .data = &pwrseq_generic_alloc_instance}, -+ { /* sentinel */ } -+}; -+ -+static int pwrseq_get(struct device_node *np, struct pwrseq *p) -+{ -+ if (p && p->get) -+ return p->get(np, p); -+ -+ return -ENOTSUPP; -+} -+ -+static int pwrseq_on(struct pwrseq *p) -+{ -+ if (p && p->on) -+ return p->on(p); -+ -+ return -ENOTSUPP; -+} -+ -+static void pwrseq_off(struct pwrseq *p) -+{ -+ if (p && p->off) -+ p->off(p); -+} -+ -+static void pwrseq_put(struct pwrseq *p) -+{ -+ if (p && p->put) -+ p->put(p); -+} -+ -+/** -+ * of_pwrseq_on - Carry out power sequence on for device node -+ * -+ * @np: the device node would like to power on -+ * -+ * Carry out a single device power on. If multiple devices -+ * need to be handled, use of_pwrseq_on_list() instead. -+ * -+ * Return a pointer to the power sequence instance on success, or NULL if -+ * not exist, or an error code on failure. -+ */ -+struct pwrseq *of_pwrseq_on(struct device_node *np) -+{ -+ struct pwrseq *pwrseq; -+ int ret; -+ const struct of_device_id *of_id; -+ struct pwrseq *(*alloc_instance)(void); -+ -+ of_id = of_match_node(pwrseq_match_table_list, np); -+ if (!of_id) -+ return NULL; -+ -+ alloc_instance = of_id->data; -+ /* Allocate pwrseq instance */ -+ pwrseq = alloc_instance(); -+ if (IS_ERR(pwrseq)) -+ return pwrseq; -+ -+ ret = pwrseq_get(np, pwrseq); -+ if (ret) -+ goto pwr_put; -+ -+ ret = pwrseq_on(pwrseq); -+ if (ret) -+ goto pwr_put; -+ -+ return pwrseq; -+ -+pwr_put: -+ pwrseq_put(pwrseq); -+ return ERR_PTR(ret); -+} -+EXPORT_SYMBOL_GPL(of_pwrseq_on); -+ -+/** -+ * of_pwrseq_off - Carry out power sequence off for this pwrseq instance -+ * -+ * @pwrseq: the pwrseq instance which related device would like to be off -+ * -+ * This API is used to power off single device, it is the opposite -+ * operation for of_pwrseq_on. -+ */ -+void of_pwrseq_off(struct pwrseq *pwrseq) -+{ -+ pwrseq_off(pwrseq); -+ pwrseq_put(pwrseq); -+} -+EXPORT_SYMBOL_GPL(of_pwrseq_off); -+ -+/** -+ * of_pwrseq_on_list - Carry out power sequence on for list -+ * -+ * @np: the device node would like to power on -+ * @head: the list head for pwrseq list on this bus -+ * -+ * This API is used to power on multiple devices at single bus. -+ * If there are several devices on bus (eg, USB bus), uses this -+ * this API. Otherwise, use of_pwrseq_on instead. After the device -+ * is powered on successfully, it will be added to pwrseq list for -+ * this bus. The caller needs to use mutex_lock for concurrent. -+ * -+ * Return 0 on success, or -ENOENT if not exist, or an error value on failure. -+ */ -+int of_pwrseq_on_list(struct device_node *np, struct list_head *head) -+{ -+ struct pwrseq *pwrseq; -+ struct pwrseq_list_per_dev *pwrseq_list_node; -+ -+ pwrseq_list_node = kzalloc(sizeof(*pwrseq_list_node), GFP_KERNEL); -+ if (!pwrseq_list_node) -+ return -ENOMEM; -+ -+ pwrseq = of_pwrseq_on(np); -+ if (!pwrseq) -+ return -ENOENT; -+ -+ if (IS_ERR(pwrseq)) { -+ kfree(pwrseq_list_node); -+ return PTR_ERR(pwrseq); -+ } -+ -+ pwrseq_list_node->pwrseq = pwrseq; -+ list_add(&pwrseq_list_node->list, head); -+ -+ return 0; -+} -+EXPORT_SYMBOL_GPL(of_pwrseq_on_list); -+ -+/** -+ * of_pwrseq_off_list - Carry out power sequence off for the list -+ * -+ * @head: the list head for pwrseq instance list on this bus -+ * -+ * This API is used to power off all devices on this bus, it is -+ * the opposite operation for of_pwrseq_on_list. -+ * The caller needs to use mutex_lock for concurrent. -+ */ -+void of_pwrseq_off_list(struct list_head *head) -+{ -+ struct pwrseq *pwrseq; -+ struct pwrseq_list_per_dev *pwrseq_list_node, *tmp_node; -+ -+ list_for_each_entry_safe(pwrseq_list_node, tmp_node, head, list) { -+ pwrseq = pwrseq_list_node->pwrseq; -+ of_pwrseq_off(pwrseq); -+ list_del(&pwrseq_list_node->list); -+ kfree(pwrseq_list_node); -+ } -+} -+EXPORT_SYMBOL_GPL(of_pwrseq_off_list); -+ -+/** -+ * pwrseq_suspend - Carry out power sequence suspend for this pwrseq instance -+ * -+ * @pwrseq: the pwrseq instance -+ * -+ * This API is used to do suspend operation on pwrseq instance. -+ * -+ * Return 0 on success, or an error value otherwise. -+ */ -+int pwrseq_suspend(struct pwrseq *p) -+{ -+ int ret = 0; -+ -+ if (p && p->suspend) -+ ret = p->suspend(p); -+ else -+ return ret; -+ -+ if (!ret) -+ p->suspended = true; -+ else -+ pr_err("%s failed\n", __func__); -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(pwrseq_suspend); -+ -+/** -+ * pwrseq_resume - Carry out power sequence resume for this pwrseq instance -+ * -+ * @pwrseq: the pwrseq instance -+ * -+ * This API is used to do resume operation on pwrseq instance. -+ * -+ * Return 0 on success, or an error value otherwise. -+ */ -+int pwrseq_resume(struct pwrseq *p) -+{ -+ int ret = 0; -+ -+ if (p && p->resume) -+ ret = p->resume(p); -+ else -+ return ret; -+ -+ if (!ret) -+ p->suspended = false; -+ else -+ pr_err("%s failed\n", __func__); -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(pwrseq_resume); -+ -+/** -+ * pwrseq_suspend_list - Carry out power sequence suspend for list -+ * -+ * @head: the list head for pwrseq instance list on this bus -+ * -+ * This API is used to do suspend on all power sequence instances on this bus. -+ * The caller needs to use mutex_lock for concurrent. -+ */ -+int pwrseq_suspend_list(struct list_head *head) -+{ -+ struct pwrseq *pwrseq; -+ struct pwrseq_list_per_dev *pwrseq_list_node; -+ int ret = 0; -+ -+ list_for_each_entry(pwrseq_list_node, head, list) { -+ ret = pwrseq_suspend(pwrseq_list_node->pwrseq); -+ if (ret) -+ break; -+ } -+ -+ if (ret) { -+ list_for_each_entry(pwrseq_list_node, head, list) { -+ pwrseq = pwrseq_list_node->pwrseq; -+ if (pwrseq->suspended) -+ pwrseq_resume(pwrseq); -+ } -+ } -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(pwrseq_suspend_list); -+ -+/** -+ * pwrseq_resume_list - Carry out power sequence resume for the list -+ * -+ * @head: the list head for pwrseq instance list on this bus -+ * -+ * This API is used to do resume on all power sequence instances on this bus. -+ * The caller needs to use mutex_lock for concurrent. -+ */ -+int pwrseq_resume_list(struct list_head *head) -+{ -+ struct pwrseq_list_per_dev *pwrseq_list_node; -+ int ret = 0; -+ -+ list_for_each_entry(pwrseq_list_node, head, list) { -+ ret = pwrseq_resume(pwrseq_list_node->pwrseq); -+ if (ret) -+ break; -+ } -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(pwrseq_resume_list); -diff --git a/drivers/power/pwrseq/pwrseq_generic.c b/drivers/power/pwrseq/pwrseq_generic.c -new file mode 100644 -index 000000000000..b7bbd6c5b47d ---- /dev/null -+++ b/drivers/power/pwrseq/pwrseq_generic.c -@@ -0,0 +1,210 @@ -+/* -+ * pwrseq_generic.c Generic power sequence handling -+ * -+ * Copyright (C) 2016 Freescale Semiconductor, Inc. -+ * Author: Peter Chen <peter.chen@nxp.com> -+ * -+ * This program is free software: you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 of -+ * the License as published by the Free Software Foundation. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program. -+ */ -+ -+#include <linux/clk.h> -+#include <linux/delay.h> -+#include <linux/gpio.h> -+#include <linux/gpio/consumer.h> -+#include <linux/of.h> -+#include <linux/of_gpio.h> -+#include <linux/slab.h> -+ -+#include <linux/power/pwrseq.h> -+ -+struct pwrseq_generic { -+ struct pwrseq pwrseq; -+ struct gpio_desc *gpiod_reset; -+ struct clk *clks[PWRSEQ_MAX_CLKS]; -+ u32 duration_us; -+ bool suspended; -+}; -+ -+#define to_generic_pwrseq(p) container_of(p, struct pwrseq_generic, pwrseq) -+ -+static int pwrseq_generic_suspend(struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ int clk; -+ -+ for (clk = PWRSEQ_MAX_CLKS - 1; clk >= 0; clk--) -+ clk_disable_unprepare(pwrseq_gen->clks[clk]); -+ -+ pwrseq_gen->suspended = true; -+ return 0; -+} -+ -+static int pwrseq_generic_resume(struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ int clk, ret = 0; -+ -+ for (clk = 0; clk < PWRSEQ_MAX_CLKS && pwrseq_gen->clks[clk]; clk++) { -+ ret = clk_prepare_enable(pwrseq_gen->clks[clk]); -+ if (ret) { -+ pr_err("Can't enable clock, ret=%d\n", ret); -+ goto err_disable_clks; -+ } -+ } -+ -+ pwrseq_gen->suspended = false; -+ return ret; -+ -+err_disable_clks: -+ while (--clk >= 0) -+ clk_disable_unprepare(pwrseq_gen->clks[clk]); -+ -+ return ret; -+} -+ -+static void pwrseq_generic_put(struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ int clk; -+ -+ if (pwrseq_gen->gpiod_reset) -+ gpiod_put(pwrseq_gen->gpiod_reset); -+ -+ for (clk = 0; clk < PWRSEQ_MAX_CLKS; clk++) -+ clk_put(pwrseq_gen->clks[clk]); -+ -+ kfree(pwrseq_gen); -+} -+ -+static void pwrseq_generic_off(struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ int clk; -+ -+ if (pwrseq_gen->suspended) -+ return; -+ -+ for (clk = PWRSEQ_MAX_CLKS - 1; clk >= 0; clk--) -+ clk_disable_unprepare(pwrseq_gen->clks[clk]); -+} -+ -+static int pwrseq_generic_on(struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ int clk, ret = 0; -+ struct gpio_desc *gpiod_reset = pwrseq_gen->gpiod_reset; -+ -+ for (clk = 0; clk < PWRSEQ_MAX_CLKS && pwrseq_gen->clks[clk]; clk++) { -+ ret = clk_prepare_enable(pwrseq_gen->clks[clk]); -+ if (ret) { -+ pr_err("Can't enable clock, ret=%d\n", ret); -+ goto err_disable_clks; -+ } -+ } -+ -+ if (gpiod_reset) { -+ u32 duration_us = pwrseq_gen->duration_us; -+ -+ if (duration_us <= 10) -+ udelay(10); -+ else -+ usleep_range(duration_us, duration_us + 100); -+ gpiod_set_value(gpiod_reset, 0); -+ } -+ -+ return ret; -+ -+err_disable_clks: -+ while (--clk >= 0) -+ clk_disable_unprepare(pwrseq_gen->clks[clk]); -+ -+ return ret; -+} -+ -+static int pwrseq_generic_get(struct device_node *np, struct pwrseq *pwrseq) -+{ -+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq); -+ enum of_gpio_flags flags; -+ int reset_gpio, clk, ret = 0; -+ -+ for (clk = 0; clk < PWRSEQ_MAX_CLKS; clk++) { -+ pwrseq_gen->clks[clk] = of_clk_get(np, clk); -+ if (IS_ERR(pwrseq_gen->clks[clk])) { -+ ret = PTR_ERR(pwrseq_gen->clks[clk]); -+ if (ret != -ENOENT) -+ goto err_put_clks; -+ pwrseq_gen->clks[clk] = NULL; -+ break; -+ } -+ } -+ -+ reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0, &flags); -+ if (gpio_is_valid(reset_gpio)) { -+ unsigned long gpio_flags; -+ -+ if (flags & OF_GPIO_ACTIVE_LOW) -+ gpio_flags = GPIOF_ACTIVE_LOW | GPIOF_OUT_INIT_LOW; -+ else -+ gpio_flags = GPIOF_OUT_INIT_HIGH; -+ -+ ret = gpio_request_one(reset_gpio, gpio_flags, -+ "pwrseq-reset-gpios"); -+ if (ret) -+ goto err_put_clks; -+ -+ pwrseq_gen->gpiod_reset = gpio_to_desc(reset_gpio); -+ of_property_read_u32(np, "reset-duration-us", -+ &pwrseq_gen->duration_us); -+ } else if (reset_gpio == -ENOENT) { -+ ; /* no such gpio */ -+ } else { -+ ret = reset_gpio; -+ pr_err("Failed to get reset gpio on %s, err = %d\n", -+ np->full_name, reset_gpio); -+ goto err_put_clks; -+ } -+ -+ return 0; -+ -+err_put_clks: -+ while (--clk >= 0) -+ clk_put(pwrseq_gen->clks[clk]); -+ return ret; -+} -+ -+/** -+ * pwrseq_generic_alloc_instance - power sequence instance allocation -+ * -+ * This function is used to allocate one generic power sequence instance, -+ * it is called when the system boots up and after one power sequence -+ * instance is got successfully. -+ * -+ * Return zero on success or an error code otherwise. -+ */ -+struct pwrseq *pwrseq_generic_alloc_instance(void) -+{ -+ struct pwrseq_generic *pwrseq_gen; -+ -+ pwrseq_gen = kzalloc(sizeof(*pwrseq_gen), GFP_KERNEL); -+ if (!pwrseq_gen) -+ return ERR_PTR(-ENOMEM); -+ -+ pwrseq_gen->pwrseq.get = pwrseq_generic_get; -+ pwrseq_gen->pwrseq.on = pwrseq_generic_on; -+ pwrseq_gen->pwrseq.off = pwrseq_generic_off; -+ pwrseq_gen->pwrseq.put = pwrseq_generic_put; -+ pwrseq_gen->pwrseq.suspend = pwrseq_generic_suspend; -+ pwrseq_gen->pwrseq.resume = pwrseq_generic_resume; -+ -+ return &pwrseq_gen->pwrseq; -+} -diff --git a/include/linux/power/pwrseq.h b/include/linux/power/pwrseq.h -new file mode 100644 -index 000000000000..c5b278f5f2ae ---- /dev/null -+++ b/include/linux/power/pwrseq.h -@@ -0,0 +1,84 @@ -+#ifndef __LINUX_PWRSEQ_H -+#define __LINUX_PWRSEQ_H -+ -+#include <linux/of.h> -+ -+#define PWRSEQ_MAX_CLKS 3 -+ -+/** -+ * struct pwrseq - the power sequence structure -+ * @pwrseq_of_match_table: the OF device id table this pwrseq library supports -+ * @node: the list pointer to be added to pwrseq list -+ * @get: the API is used to get pwrseq instance from the device node -+ * @on: do power on for this pwrseq instance -+ * @off: do power off for this pwrseq instance -+ * @put: release the resources on this pwrseq instance -+ * @suspend: do suspend operation on this pwrseq instance -+ * @resume: do resume operation on this pwrseq instance -+ */ -+struct pwrseq { -+ const struct of_device_id *pwrseq_of_match_table; -+ struct list_head node; -+ int (*get)(struct device_node *np, struct pwrseq *p); -+ int (*on)(struct pwrseq *p); -+ void (*off)(struct pwrseq *p); -+ void (*put)(struct pwrseq *p); -+ int (*suspend)(struct pwrseq *p); -+ int (*resume)(struct pwrseq *p); -+ bool suspended; -+}; -+ -+/* used for power sequence instance list in one driver */ -+struct pwrseq_list_per_dev { -+ struct pwrseq *pwrseq; -+ struct list_head list; -+}; -+ -+#if IS_ENABLED(CONFIG_POWER_SEQUENCE) -+struct pwrseq *of_pwrseq_on(struct device_node *np); -+void of_pwrseq_off(struct pwrseq *pwrseq); -+int of_pwrseq_on_list(struct device_node *np, struct list_head *head); -+void of_pwrseq_off_list(struct list_head *head); -+int pwrseq_suspend(struct pwrseq *p); -+int pwrseq_resume(struct pwrseq *p); -+int pwrseq_suspend_list(struct list_head *head); -+int pwrseq_resume_list(struct list_head *head); -+#else -+static inline struct pwrseq *of_pwrseq_on(struct device_node *np) -+{ -+ return NULL; -+} -+static void of_pwrseq_off(struct pwrseq *pwrseq) {} -+static int of_pwrseq_on_list(struct device_node *np, struct list_head *head) -+{ -+ return 0; -+} -+static void of_pwrseq_off_list(struct list_head *head) {} -+static int pwrseq_suspend(struct pwrseq *p) -+{ -+ return 0; -+} -+static int pwrseq_resume(struct pwrseq *p) -+{ -+ return 0; -+} -+static int pwrseq_suspend_list(struct list_head *head) -+{ -+ return 0; -+} -+static int pwrseq_resume_list(struct list_head *head) -+{ -+ return 0; -+} -+#endif /* CONFIG_POWER_SEQUENCE */ -+ -+#if IS_ENABLED(CONFIG_PWRSEQ_GENERIC) -+extern struct pwrseq *pwrseq_generic_alloc_instance(void); -+#else -+static inline struct pwrseq *pwrseq_generic_alloc_instance(void) -+{ -+ return ERR_PTR(-ENOTSUPP); -+} -+#endif /* CONFIG_PWRSEQ_GENERIC */ -+ -+#endif /* __LINUX_PWRSEQ_H */ --- -2.18.0 - |