dm: Add a power sequencing uclass

Some devices need special sequences to be used when starting up. Add a uclass for this. Drivers can be added to provide specific features as needed. Signed-off-by: Simon Glass <sjg@chromium.org>

dm: Add a power sequencing uclass
Some devices need special sequences to be used when starting up. Add a uclass for this. Drivers can be added to provide specific features as needed. Signed-off-by: Simon Glass <sjg@chromium.org>
Simon Glass
1 parent e1227764cd
Showing 5 changed files with 62 additions and 0 deletions Side-by-side Diff
drivers/misc/Kconfig
drivers/misc/Makefile
drivers/misc/pwrseq-uclass.c
include/dm/uclass-id.h
include/pwrseq.h
@@ -90,6 +90,24 @@
 	  Programmable memory pages that are stored on the some
 	  Freescale i.MX processors.
  
+config PWRSEQ
+	bool "Enable power-sequencing drivers"
+	depends on DM
+	help
+	  Power-sequencing drivers provide support for controlling power for
+	  devices. They are typically referenced by a phandle from another
+	  device. When the device is started up, its power sequence can be
+	  initiated.
+
+config SPL_PWRSEQ
+	bool "Enable power-sequencing drivers for SPL"
+	depends on PWRSEQ
+	help
+	  Power-sequencing drivers provide support for controlling power for
+	  devices. They are typically referenced by a phandle from another
+	  device. When the device is started up, its power sequence can be
+	  initiated.
+
 config PCA9551_LED
 	bool "Enable PCA9551 LED driver"
 	help
@@ -24,6 +24,7 @@
 obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
 obj-$(CONFIG_NS87308) += ns87308.o
 obj-$(CONFIG_PDSP188x) += pdsp188x.o
+obj-$(CONFIG_$(SPL_)PWRSEQ) += pwrseq-uclass.o
 obj-$(CONFIG_SANDBOX) += reset_sandbox.o
 ifdef CONFIG_DM_I2C
 obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pwrseq.h>
+
+int pwrseq_set_power(struct udevice *dev, bool enable)
+{
+	struct pwrseq_ops *ops = pwrseq_get_ops(dev);
+
+	if (!ops->set_power)
+		return -ENOSYS;
+
+	return ops->set_power(dev, enable);
+}
+
+UCLASS_DRIVER(pwrseq) = {
+	.id		= UCLASS_PWRSEQ,
+	.name		= "pwrseq",
+};
@@ -51,6 +51,7 @@
 	UCLASS_PINCTRL,		/* Pinctrl (pin muxing/configuration) device */
 	UCLASS_PINCONFIG,	/* Pin configuration node device */
 	UCLASS_PMIC,		/* PMIC I/O device */
+	UCLASS_PWRSEQ,		/* Power sequence device */
 	UCLASS_REGULATOR,	/* Regulator device */
 	UCLASS_RESET,		/* Reset device */
 	UCLASS_REMOTEPROC,	/* Remote Processor device */
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __pwrseq_h
+#define __pwrseq_h
+
+struct pwrseq_ops {
+	int (*set_power)(struct udevice *dev, bool enable);
+};
+
+#define pwrseq_get_ops(dev)	((struct pwrseq_ops *)(dev)->driver->ops)
+
+int pwrseq_set_power(struct udevice *dev, bool enable);
+
+#endif
...	...	@@ -90,6 +90,24 @@
90	90	Programmable memory pages that are stored on the some
91	91	Freescale i.MX processors.
92	92
	93	+config PWRSEQ
	94	+ bool "Enable power-sequencing drivers"
	95	+ depends on DM
	96	+ help
	97	+ Power-sequencing drivers provide support for controlling power for
	98	+ devices. They are typically referenced by a phandle from another
	99	+ device. When the device is started up, its power sequence can be
	100	+ initiated.
	101	+
	102	+config SPL_PWRSEQ
	103	+ bool "Enable power-sequencing drivers for SPL"
	104	+ depends on PWRSEQ
	105	+ help
	106	+ Power-sequencing drivers provide support for controlling power for
	107	+ devices. They are typically referenced by a phandle from another
	108	+ device. When the device is started up, its power sequence can be
	109	+ initiated.
	110	+
93	111	config PCA9551_LED
94	112	bool "Enable PCA9551 LED driver"
95	113	help
...	...	@@ -24,6 +24,7 @@
24	24	obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
25	25	obj-$(CONFIG_NS87308) += ns87308.o
26	26	obj-$(CONFIG_PDSP188x) += pdsp188x.o
	27	+obj-$(CONFIG_$(SPL_)PWRSEQ) += pwrseq-uclass.o
27	28	obj-$(CONFIG_SANDBOX) += reset_sandbox.o
28	29	ifdef CONFIG_DM_I2C
29	30	obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o
	1	+/*
	2	+ * Copyright (c) 2015 Google, Inc
	3	+ *
	4	+ * SPDX-License-Identifier: GPL-2.0+
	5	+ */
	6	+
	7	+#include <common.h>
	8	+#include <dm.h>
	9	+#include <pwrseq.h>
	10	+
	11	+int pwrseq_set_power(struct udevice *dev, bool enable)
	12	+{
	13	+ struct pwrseq_ops *ops = pwrseq_get_ops(dev);
	14	+
	15	+ if (!ops->set_power)
	16	+ return -ENOSYS;
	17	+
	18	+ return ops->set_power(dev, enable);
	19	+}
	20	+
	21	+UCLASS_DRIVER(pwrseq) = {
	22	+ .id = UCLASS_PWRSEQ,
	23	+ .name = "pwrseq",
	24	+};
...	...	@@ -51,6 +51,7 @@
51	51	UCLASS_PINCTRL, /* Pinctrl (pin muxing/configuration) device */
52	52	UCLASS_PINCONFIG, /* Pin configuration node device */
53	53	UCLASS_PMIC, /* PMIC I/O device */
	54	+ UCLASS_PWRSEQ, /* Power sequence device */
54	55	UCLASS_REGULATOR, /* Regulator device */
55	56	UCLASS_RESET, /* Reset device */
56	57	UCLASS_REMOTEPROC, /* Remote Processor device */
	1	+/*
	2	+ * Copyright (c) 2013 Google, Inc
	3	+ *
	4	+ * SPDX-License-Identifier: GPL-2.0+
	5	+ */
	6	+
	7	+#ifndef __pwrseq_h
	8	+#define __pwrseq_h
	9	+
	10	+struct pwrseq_ops {
	11	+ int (set_power)(struct udevice dev, bool enable);
	12	+};
	13	+
	14	+#define pwrseq_get_ops(dev) ((struct pwrseq_ops *)(dev)->driver->ops)
	15	+
	16	+int pwrseq_set_power(struct udevice *dev, bool enable);
	17	+
	18	+#endif