[U-Boot] [PATCH 08/50] dm: Add a power sequencing uclass

Simon Glass
2016-01-13T23:24:58Z

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>
---

drivers/misc/Kconfig | 18 ++++++++++++++++++
drivers/misc/Makefile | 1 +
drivers/misc/pwrseq-uclass.c | 24 ++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/pwrseq.h | 18 ++++++++++++++++++
5 files changed, 62 insertions(+)
create mode 100644 drivers/misc/pwrseq-uclass.c
create mode 100644 include/pwrseq.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b92da4e..cba2363 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -90,6 +90,24 @@ config MXC_OCOTP
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
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index aa137f5..fc8eb6f 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_MXC_OCOTP) += mxc_ocotp.o
obj-$(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
diff --git a/drivers/misc/pwrseq-uclass.c b/drivers/misc/pwrseq-uclass.c
new file mode 100644
index 0000000..8ed2ad4
--- /dev/null
+++ b/drivers/misc/pwrseq-uclass.c
@@ -0,0 +1,24 @@
+/*
+ * 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",
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index a0a3a79..b5f43ae 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -51,6 +51,7 @@ enum uclass_id {
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 */
diff --git a/include/pwrseq.h b/include/pwrseq.h
new file mode 100644
index 0000000..b934f29
--- /dev/null
+++ b/include/pwrseq.h
@@ -0,0 +1,18 @@
+/*
+ * 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
--
2.6.0.rc2.230.g3dd15c0