* [PATCH u-boot v2019.04-aspeed-openbmc v4 1/6] dm: Add a No-op uclass
2022-02-07 23:13 [PATCH u-boot v2019.04-aspeed-openbmc v4 0/6] Add GPIO hog support Eddie James
@ 2022-02-07 23:13 ` Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 2/6] gpio: add gpio-hog support Eddie James
` (4 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Eddie James @ 2022-02-07 23:13 UTC (permalink / raw)
To: openbmc; +Cc: andrew
From: Jean-Jacques Hiblot <jjhiblot@ti.com>
This uclass is intended for devices that do not need any features from the
uclass, including binding children.
This will typically be used by devices that are used to bind child devices
but do not use dm_scan_fdt_dev() to do it. That is for example the case of
several USB wrappers that have 2 child devices (1 for device and 1 for
host) but bind only one at a any given time.
(cherry-picked from 07e33711fec4f1106f36805b5dc830da07c783c5)
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
arch/sandbox/dts/test.dts | 12 +++++++
drivers/core/uclass.c | 5 +++
include/dm/uclass-id.h | 1 +
test/dm/Makefile | 1 +
test/dm/nop.c | 73 +++++++++++++++++++++++++++++++++++++++
5 files changed, 92 insertions(+)
create mode 100644 test/dm/nop.c
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 87d8e5bcc9..b705161086 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -400,6 +400,18 @@
sandbox,silent; /* Don't emit sounds while testing */
};
+ nop-test_0 {
+ compatible = "sandbox,nop_sandbox1";
+ nop-test_1 {
+ compatible = "sandbox,nop_sandbox2";
+ bind = "True";
+ };
+ nop-test_2 {
+ compatible = "sandbox,nop_sandbox2";
+ bind = "False";
+ };
+ };
+
misc-test {
compatible = "sandbox,misc_sandbox";
};
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index fc3157de39..dc9eb62893 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -757,3 +757,8 @@ int uclass_pre_remove_device(struct udevice *dev)
return 0;
}
#endif
+
+UCLASS_DRIVER(nop) = {
+ .id = UCLASS_NOP,
+ .name = "nop",
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 13ae6e1e4c..281c0d6ed2 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -62,6 +62,7 @@ enum uclass_id {
UCLASS_MMC, /* SD / MMC card or chip */
UCLASS_MOD_EXP, /* RSA Mod Exp device */
UCLASS_MTD, /* Memory Technology Device (MTD) device */
+ UCLASS_NOP, /* No-op devices */
UCLASS_NORTHBRIDGE, /* Intel Northbridge / SDRAM controller */
UCLASS_NVME, /* NVM Express device */
UCLASS_PANEL, /* Display panel, such as an LCD */
diff --git a/test/dm/Makefile b/test/dm/Makefile
index 49857c5092..aeb3aa0ca7 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -3,6 +3,7 @@
# Copyright (c) 2013 Google, Inc
obj-$(CONFIG_UT_DM) += bus.o
+obj-$(CONFIG_UT_DM) += nop.o
obj-$(CONFIG_UT_DM) += test-driver.o
obj-$(CONFIG_UT_DM) += test-fdt.o
obj-$(CONFIG_UT_DM) += test-main.o
diff --git a/test/dm/nop.c b/test/dm/nop.c
new file mode 100644
index 0000000000..2df29f3d15
--- /dev/null
+++ b/test/dm/nop.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Test for the NOP uclass
+ *
+ * (C) Copyright 2019 - Texas Instruments Incorporated - http://www.ti.com/
+ * Jean-Jacques Hiblot <jjhiblot@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/ofnode.h>
+#include <dm/lists.h>
+#include <dm/device.h>
+#include <dm/test.h>
+#include <misc.h>
+#include <test/ut.h>
+
+static int noptest_bind(struct udevice *parent)
+{
+ ofnode ofnode = dev_read_first_subnode(parent);
+
+ while (ofnode_valid(ofnode)) {
+ struct udevice *dev;
+ const char *bind_flag = ofnode_read_string(ofnode, "bind");
+
+ if (bind_flag && (strcmp(bind_flag, "True") == 0))
+ lists_bind_fdt(parent, ofnode, &dev, false);
+ ofnode = dev_read_next_subnode(ofnode);
+ }
+
+ return 0;
+}
+
+static const struct udevice_id noptest1_ids[] = {
+ {
+ .compatible = "sandbox,nop_sandbox1",
+ },
+ { }
+};
+
+U_BOOT_DRIVER(noptest_drv1) = {
+ .name = "noptest1_drv",
+ .of_match = noptest1_ids,
+ .id = UCLASS_NOP,
+ .bind = noptest_bind,
+};
+
+static const struct udevice_id noptest2_ids[] = {
+ {
+ .compatible = "sandbox,nop_sandbox2",
+ },
+ { }
+};
+
+U_BOOT_DRIVER(noptest_drv2) = {
+ .name = "noptest2_drv",
+ .of_match = noptest2_ids,
+ .id = UCLASS_NOP,
+};
+
+static int dm_test_nop(struct unit_test_state *uts)
+{
+ struct udevice *dev;
+
+ ut_assertok(uclass_get_device_by_name(UCLASS_NOP, "nop-test_0", &dev));
+ ut_assertok(uclass_get_device_by_name(UCLASS_NOP, "nop-test_1", &dev));
+ ut_asserteq(-ENODEV,
+ uclass_get_device_by_name(UCLASS_NOP, "nop-test_2", &dev));
+
+ return 0;
+}
+
+DM_TEST(dm_test_nop, DM_TESTF_FLAT_TREE | DM_TESTF_SCAN_FDT);
--
2.27.0
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH u-boot v2019.04-aspeed-openbmc v4 2/6] gpio: add gpio-hog support
2022-02-07 23:13 [PATCH u-boot v2019.04-aspeed-openbmc v4 0/6] Add GPIO hog support Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 1/6] dm: Add a No-op uclass Eddie James
@ 2022-02-07 23:13 ` Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 3/6] gpio: fixes for " Eddie James
` (3 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Eddie James @ 2022-02-07 23:13 UTC (permalink / raw)
To: openbmc; +Cc: andrew
From: Heiko Schocher <hs@denx.de>
add gpio-hog support. GPIO hogging is a mechanism
providing automatic GPIO request and configuration
as part of the gpio-controller's driver probe function.
for more infos see:
doc/device-tree-bindings/gpio/gpio.txt
(cherry-picked from 5fc7cf8c8e268590f3b0037eecea7f6798209f78)
Signed-off-by: Heiko Schocher <hs@denx.de>
Tested-by: Michal Simek <michal.simek@xilinx.com> (zcu102)
Tested-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
common/board_r.c | 6 +
doc/device-tree-bindings/gpio/gpio.txt | 55 ++++++++
drivers/gpio/Kconfig | 10 ++
drivers/gpio/gpio-uclass.c | 181 ++++++++++++++++++++++---
include/asm-generic/gpio.h | 32 +++++
5 files changed, 268 insertions(+), 16 deletions(-)
diff --git a/common/board_r.c b/common/board_r.c
index 472987d5d5..5bb8f88bd0 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -48,6 +48,9 @@
#include <linux/compiler.h>
#include <linux/err.h>
#include <efi_loader.h>
+#if defined(CONFIG_DM_GPIO_HOG)
+#include <asm/gpio.h>
+#endif
DECLARE_GLOBAL_DATA_PTR;
@@ -785,6 +788,9 @@ static init_fnc_t init_sequence_r[] = {
#ifdef CONFIG_CMD_NET
initr_ethaddr,
#endif
+#if defined(CONFIG_DM_GPIO_HOG)
+ gpio_hog_probe_all,
+#endif
#ifdef CONFIG_BOARD_LATE_INIT
board_late_init,
#endif
diff --git a/doc/device-tree-bindings/gpio/gpio.txt b/doc/device-tree-bindings/gpio/gpio.txt
index f7a158d858..e774439369 100644
--- a/doc/device-tree-bindings/gpio/gpio.txt
+++ b/doc/device-tree-bindings/gpio/gpio.txt
@@ -210,3 +210,58 @@ Example 2:
Here, three GPIO ranges are defined wrt. two pin controllers. pinctrl1 GPIO
ranges are defined using pin numbers whereas the GPIO ranges wrt. pinctrl2
are named "foo" and "bar".
+
+3) GPIO hog definitions
+-----------------------
+
+The GPIO chip may contain GPIO hog definitions. GPIO hogging is a mechanism
+providing automatic GPIO request and configuration as part of the
+gpio-controller's driver probe function.
+
+Each GPIO hog definition is represented as a child node of the GPIO controller.
+Required properties:
+- gpio-hog: A property specifying that this child node represents a GPIO hog.
+- gpios: Store the GPIO information (id, flags) for the GPIO to
+ affect.
+
+ ! Not yet support more than one gpio !
+
+Only one of the following properties scanned in the order shown below.
+- input: A property specifying to set the GPIO direction as input.
+- output-low A property specifying to set the GPIO direction as output with
+ the value low.
+- output-high A property specifying to set the GPIO direction as output with
+ the value high.
+
+Optional properties:
+- line-name: The GPIO label name. If not present the node name is used.
+
+Example:
+
+ tca6416@20 {
+ compatible = "ti,tca6416";
+ reg = <0x20>;
+ #gpio-cells = <2>;
+ gpio-controller;
+
+ env_reset {
+ gpio-hog;
+ input;
+ gpios = <6 GPIO_ACTIVE_LOW>;
+ };
+ boot_rescue {
+ gpio-hog;
+ input;
+ gpios = <7 GPIO_ACTIVE_LOW>;
+ };
+ };
+
+For the above Example you can than access the gpio in your boardcode
+with:
+
+ desc = gpio_hog_lookup_name("boot_rescue.gpio-hog");
+ if (desc) {
+ if (dm_gpio_get_value(desc))
+ printf("\nBooting into Rescue System\n");
+ else
+ printf("\nBoot normal\n");
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a519a0a169..56ed37c2b5 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -14,6 +14,16 @@ config DM_GPIO
particular GPIOs that they provide. The uclass interface
is defined in include/asm-generic/gpio.h.
+config DM_GPIO_HOG
+ bool "Enable GPIO hog support"
+ depends on DM_GPIO
+ default n
+ help
+ Enable gpio hog support
+ The GPIO chip may contain GPIO hog definitions. GPIO hogging
+ is a mechanism providing automatic GPIO request and config-
+ uration as part of the gpio-controller's driver probe function.
+
config ALTERA_PIO
bool "Altera PIO driver"
depends on DM_GPIO
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index da5e9ba6e5..308d0863ad 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -5,6 +5,9 @@
#include <common.h>
#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/uclass-internal.h>
#include <dt-bindings/gpio/gpio.h>
#include <errno.h>
#include <fdtdec.h>
@@ -141,6 +144,118 @@ static int gpio_find_and_xlate(struct gpio_desc *desc,
return gpio_xlate_offs_flags(desc->dev, desc, args);
}
+#if defined(CONFIG_DM_GPIO_HOG)
+
+struct gpio_hog_priv {
+ struct gpio_desc gpiod;
+};
+
+struct gpio_hog_data {
+ int gpiod_flags;
+ int value;
+ u32 val[2];
+};
+
+static int gpio_hog_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_hog_data *plat = dev_get_platdata(dev);
+ const char *nodename;
+ int ret;
+
+ plat->value = 0;
+ if (dev_read_bool(dev, "input")) {
+ plat->gpiod_flags = GPIOD_IS_IN;
+ } else if (dev_read_bool(dev, "output-high")) {
+ plat->value = 1;
+ plat->gpiod_flags = GPIOD_IS_OUT;
+ } else if (dev_read_bool(dev, "output-low")) {
+ plat->gpiod_flags = GPIOD_IS_OUT;
+ } else {
+ printf("%s: missing gpio-hog state.\n", __func__);
+ return -EINVAL;
+ }
+ ret = dev_read_u32_array(dev, "gpios", plat->val, 2);
+ if (ret) {
+ printf("%s: wrong gpios property, 2 values needed %d\n",
+ __func__, ret);
+ return ret;
+ }
+ nodename = dev_read_string(dev, "line-name");
+ if (!nodename)
+ nodename = dev_read_name(dev);
+ device_set_name(dev, nodename);
+
+ return 0;
+}
+
+static int gpio_hog_probe(struct udevice *dev)
+{
+ struct gpio_hog_data *plat = dev_get_platdata(dev);
+ struct gpio_hog_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = gpio_dev_request_index(dev->parent, dev->name, "gpio-hog",
+ plat->val[0], plat->gpiod_flags,
+ plat->val[1], &priv->gpiod);
+ if (ret < 0) {
+ debug("%s: node %s could not get gpio.\n", __func__,
+ dev->name);
+ return ret;
+ }
+ dm_gpio_set_dir(&priv->gpiod);
+ if (plat->gpiod_flags == GPIOD_IS_OUT)
+ dm_gpio_set_value(&priv->gpiod, plat->value);
+
+ return 0;
+}
+
+int gpio_hog_probe_all(void)
+{
+ struct udevice *dev;
+ int ret;
+
+ for (uclass_first_device(UCLASS_NOP, &dev);
+ dev;
+ uclass_find_next_device(&dev)) {
+ if (dev->driver == DM_GET_DRIVER(gpio_hog)) {
+ ret = device_probe(dev);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+struct gpio_desc *gpio_hog_lookup_name(const char *name)
+{
+ struct udevice *dev;
+
+ gpio_hog_probe_all();
+ if (!uclass_get_device_by_name(UCLASS_NOP, name, &dev)) {
+ struct gpio_hog_priv *priv = dev_get_priv(dev);
+
+ return &priv->gpiod;
+ }
+
+ return NULL;
+}
+
+U_BOOT_DRIVER(gpio_hog) = {
+ .name = "gpio_hog",
+ .id = UCLASS_NOP,
+ .ofdata_to_platdata = gpio_hog_ofdata_to_platdata,
+ .probe = gpio_hog_probe,
+ .priv_auto_alloc_size = sizeof(struct gpio_hog_priv),
+ .platdata_auto_alloc_size = sizeof(struct gpio_hog_data),
+};
+#else
+struct gpio_desc *gpio_hog_lookup_name(const char *name)
+{
+ return NULL;
+}
+#endif
+
int dm_gpio_request(struct gpio_desc *desc, const char *label)
{
struct udevice *dev = desc->dev;
@@ -640,22 +755,25 @@ int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
return vector;
}
-static int gpio_request_tail(int ret, ofnode node,
+static int gpio_request_tail(int ret, const char *nodename,
struct ofnode_phandle_args *args,
const char *list_name, int index,
- struct gpio_desc *desc, int flags, bool add_index)
+ struct gpio_desc *desc, int flags,
+ bool add_index, struct udevice *dev)
{
- desc->dev = NULL;
+ desc->dev = dev;
desc->offset = 0;
desc->flags = 0;
if (ret)
goto err;
- ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
- &desc->dev);
- if (ret) {
- debug("%s: uclass_get_device_by_ofnode failed\n", __func__);
- goto err;
+ if (!desc->dev) {
+ ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
+ &desc->dev);
+ if (ret) {
+ debug("%s: uclass_get_device_by_ofnode failed\n", __func__);
+ goto err;
+ }
}
ret = gpio_find_and_xlate(desc, args);
if (ret) {
@@ -663,8 +781,7 @@ static int gpio_request_tail(int ret, ofnode node,
goto err;
}
ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
- ofnode_get_name(node),
- list_name, index);
+ nodename, list_name, index);
if (ret) {
debug("%s: dm_gpio_requestf failed\n", __func__);
goto err;
@@ -678,7 +795,7 @@ static int gpio_request_tail(int ret, ofnode node,
return 0;
err:
debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n",
- __func__, ofnode_get_name(node), list_name, index, ret);
+ __func__, nodename, list_name, index, ret);
return ret;
}
@@ -692,8 +809,8 @@ static int _gpio_request_by_name_nodev(ofnode node, const char *list_name,
ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0,
index, &args);
- return gpio_request_tail(ret, node, &args, list_name, index, desc,
- flags, add_index);
+ return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
+ index, desc, flags, add_index, NULL);
}
int gpio_request_by_name_nodev(ofnode node, const char *list_name, int index,
@@ -707,13 +824,14 @@ int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
struct gpio_desc *desc, int flags)
{
struct ofnode_phandle_args args;
+ ofnode node;
int ret;
ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0,
index, &args);
-
- return gpio_request_tail(ret, dev_ofnode(dev), &args, list_name,
- index, desc, flags, index > 0);
+ node = dev_ofnode(dev);
+ return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
+ index, desc, flags, index > 0, NULL);
}
int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
@@ -854,8 +972,28 @@ static int gpio_pre_remove(struct udevice *dev)
return gpio_renumber(dev);
}
+int gpio_dev_request_index(struct udevice *dev, const char *nodename,
+ char *list_name, int index, int flags,
+ int dtflags, struct gpio_desc *desc)
+{
+ struct ofnode_phandle_args args;
+
+ args.node = ofnode_null();
+ args.args_count = 2;
+ args.args[0] = index;
+ args.args[1] = dtflags;
+
+ return gpio_request_tail(0, nodename, &args, list_name, index, desc,
+ flags, 0, dev);
+}
+
static int gpio_post_bind(struct udevice *dev)
{
+#if defined(CONFIG_DM_GPIO_HOG)
+ struct udevice *child;
+ ofnode node;
+#endif
+
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct dm_gpio_ops *ops = (struct dm_gpio_ops *)device_get_ops(dev);
static int reloc_done;
@@ -885,6 +1023,17 @@ static int gpio_post_bind(struct udevice *dev)
reloc_done++;
}
#endif
+
+#if defined(CONFIG_DM_GPIO_HOG)
+ dev_for_each_subnode(node, dev) {
+ if (ofnode_read_bool(node, "gpio-hog")) {
+ const char *name = ofnode_get_name(node);
+
+ device_bind_driver_to_node(dev, "gpio_hog", name,
+ node, &child);
+ }
+ }
+#endif
return 0;
}
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index d03602696f..37f71e5708 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -348,6 +348,22 @@ const char *gpio_get_bank_info(struct udevice *dev, int *offset_count);
*/
int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc);
+/**
+ * gpio_hog_lookup_name() - Look up a named GPIO and return the gpio descr.
+ *
+ * @name: Name to look up
+ * @return: Returns gpio_desc for gpio
+ */
+struct gpio_desc *gpio_hog_lookup_name(const char *name);
+
+/**
+ * gpio_hog_probe_all() - probe all gpio devices with
+ * gpio-hog subnodes.
+ *
+ * @return: Returns return value from device_probe()
+ */
+int gpio_hog_probe_all(void);
+
/**
* gpio_lookup_name - Look up a GPIO name and return its details
*
@@ -503,6 +519,22 @@ int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
struct gpio_desc *desc_list, int max_count,
int flags);
+/**
+ * gpio_dev_request_index() - request single GPIO from gpio device
+ *
+ * @dev: GPIO device
+ * @nodename: Name of node
+ * @list_name: Name of GPIO list (e.g. "board-id-gpios")
+ * @index: Index number of the GPIO in that list use request (0=first)
+ * @flags: GPIOD_* flags
+ * @dtflags: GPIO flags read from DT
+ * @desc: GPIO descriotor filled from this function
+ * @return: return value from gpio_request_tail()
+ */
+int gpio_dev_request_index(struct udevice *dev, const char *nodename,
+ char *list_name, int index, int flags,
+ int dtflags, struct gpio_desc *desc);
+
/**
* dm_gpio_free() - Free a single GPIO
*
--
2.27.0
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH u-boot v2019.04-aspeed-openbmc v4 3/6] gpio: fixes for gpio-hog support
2022-02-07 23:13 [PATCH u-boot v2019.04-aspeed-openbmc v4 0/6] Add GPIO hog support Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 1/6] dm: Add a No-op uclass Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 2/6] gpio: add gpio-hog support Eddie James
@ 2022-02-07 23:13 ` Eddie James
2022-02-07 23:13 ` [PATCH u-boot v2019.04-aspeed-openbmc v4 4/6] gpio: Enable hogging support in SPL Eddie James
` (2 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Eddie James @ 2022-02-07 23:13 UTC (permalink / raw)
To: openbmc; +Cc: andrew
From: Heiko Schocher <hs@denx.de>
recently added gpio hog patch was "in discussion"
state with Simon Glass. This patch now adds most
of comments from Simon Glass.
(cherry-picked from 49b10cb4926285b856b207c1f5bb40c75487f08b)
Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
common/board_r.c | 4 +-
doc/device-tree-bindings/gpio/gpio.txt | 17 ++--
drivers/gpio/Kconfig | 2 +-
drivers/gpio/gpio-uclass.c | 103 ++++++++++++++++++-------
include/asm-generic/gpio.h | 12 +--
5 files changed, 96 insertions(+), 42 deletions(-)
diff --git a/common/board_r.c b/common/board_r.c
index 5bb8f88bd0..429b9a2833 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -48,7 +48,7 @@
#include <linux/compiler.h>
#include <linux/err.h>
#include <efi_loader.h>
-#if defined(CONFIG_DM_GPIO_HOG)
+#if defined(CONFIG_GPIO_HOG)
#include <asm/gpio.h>
#endif
@@ -788,7 +788,7 @@ static init_fnc_t init_sequence_r[] = {
#ifdef CONFIG_CMD_NET
initr_ethaddr,
#endif
-#if defined(CONFIG_DM_GPIO_HOG)
+#if defined(CONFIG_GPIO_HOG)
gpio_hog_probe_all,
#endif
#ifdef CONFIG_BOARD_LATE_INIT
diff --git a/doc/device-tree-bindings/gpio/gpio.txt b/doc/device-tree-bindings/gpio/gpio.txt
index e774439369..e146917ff3 100644
--- a/doc/device-tree-bindings/gpio/gpio.txt
+++ b/doc/device-tree-bindings/gpio/gpio.txt
@@ -252,6 +252,7 @@ Example:
boot_rescue {
gpio-hog;
input;
+ line-name = "foo-bar-gpio";
gpios = <7 GPIO_ACTIVE_LOW>;
};
};
@@ -259,9 +260,13 @@ Example:
For the above Example you can than access the gpio in your boardcode
with:
- desc = gpio_hog_lookup_name("boot_rescue.gpio-hog");
- if (desc) {
- if (dm_gpio_get_value(desc))
- printf("\nBooting into Rescue System\n");
- else
- printf("\nBoot normal\n");
+ struct gpio_desc *desc;
+ int ret;
+
+ ret = gpio_hog_lookup_name("boot_rescue", &desc);
+ if (ret)
+ return;
+ if (dm_gpio_get_value(desc) == 1)
+ printf("\nBooting into Rescue System\n");
+ else if (dm_gpio_get_value(desc) == 0)
+ printf("\nBoot normal\n");
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 56ed37c2b5..a8dc16ca0e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -14,7 +14,7 @@ config DM_GPIO
particular GPIOs that they provide. The uclass interface
is defined in include/asm-generic/gpio.h.
-config DM_GPIO_HOG
+config GPIO_HOG
bool "Enable GPIO hog support"
depends on DM_GPIO
default n
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 308d0863ad..01cfa2f788 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -144,7 +144,7 @@ static int gpio_find_and_xlate(struct gpio_desc *desc,
return gpio_xlate_offs_flags(desc->dev, desc, args);
}
-#if defined(CONFIG_DM_GPIO_HOG)
+#if defined(CONFIG_GPIO_HOG)
struct gpio_hog_priv {
struct gpio_desc gpiod;
@@ -181,9 +181,8 @@ static int gpio_hog_ofdata_to_platdata(struct udevice *dev)
return ret;
}
nodename = dev_read_string(dev, "line-name");
- if (!nodename)
- nodename = dev_read_name(dev);
- device_set_name(dev, nodename);
+ if (nodename)
+ device_set_name(dev, nodename);
return 0;
}
@@ -202,9 +201,15 @@ static int gpio_hog_probe(struct udevice *dev)
dev->name);
return ret;
}
- dm_gpio_set_dir(&priv->gpiod);
- if (plat->gpiod_flags == GPIOD_IS_OUT)
- dm_gpio_set_value(&priv->gpiod, plat->value);
+
+ if (plat->gpiod_flags == GPIOD_IS_OUT) {
+ ret = dm_gpio_set_value(&priv->gpiod, plat->value);
+ if (ret < 0) {
+ debug("%s: node %s could not set gpio.\n", __func__,
+ dev->name);
+ return ret;
+ }
+ }
return 0;
}
@@ -213,32 +218,38 @@ int gpio_hog_probe_all(void)
{
struct udevice *dev;
int ret;
+ int retval = 0;
for (uclass_first_device(UCLASS_NOP, &dev);
dev;
uclass_find_next_device(&dev)) {
if (dev->driver == DM_GET_DRIVER(gpio_hog)) {
ret = device_probe(dev);
- if (ret)
- return ret;
+ if (ret) {
+ printf("Failed to probe device %s err: %d\n",
+ dev->name, ret);
+ retval = ret;
+ }
}
}
- return 0;
+ return retval;
}
-struct gpio_desc *gpio_hog_lookup_name(const char *name)
+int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
{
struct udevice *dev;
+ *desc = NULL;
gpio_hog_probe_all();
if (!uclass_get_device_by_name(UCLASS_NOP, name, &dev)) {
struct gpio_hog_priv *priv = dev_get_priv(dev);
- return &priv->gpiod;
+ *desc = &priv->gpiod;
+ return 0;
}
- return NULL;
+ return -ENODEV;
}
U_BOOT_DRIVER(gpio_hog) = {
@@ -250,9 +261,9 @@ U_BOOT_DRIVER(gpio_hog) = {
.platdata_auto_alloc_size = sizeof(struct gpio_hog_data),
};
#else
-struct gpio_desc *gpio_hog_lookup_name(const char *name)
+int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
{
- return NULL;
+ return 0;
}
#endif
@@ -755,13 +766,45 @@ int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
return vector;
}
+/**
+ * gpio_request_tail: common work for requesting a gpio.
+ *
+ * ret: return value from previous work in function which calls
+ * this function.
+ * This seems bogus (why calling this function instead not
+ * calling it and end caller function instead?).
+ * Because on error in caller function we want to set some
+ * default values in gpio desc and have a common error
+ * debug message, which provides this function.
+ * nodename: Name of node for which gpio gets requested
+ * used for gpio label name.
+ * args: pointer to output arguments structure
+ * list_name: Name of GPIO list
+ * used for gpio label name.
+ * index: gpio index in gpio list
+ * used for gpio label name.
+ * desc: pointer to gpio descriptor, filled from this
+ * function.
+ * flags: gpio flags to use.
+ * add_index: should index added to gpio label name
+ * gpio_dev: pointer to gpio device from which the gpio
+ * will be requested. If NULL try to get the
+ * gpio device with uclass_get_device_by_ofnode()
+ *
+ * return: In error case this function sets default values in
+ * gpio descriptor, also emmits a debug message.
+ * On success it returns 0 else the error code from
+ * function calls, or the error code passed through
+ * ret to this function.
+ *
+ */
static int gpio_request_tail(int ret, const char *nodename,
struct ofnode_phandle_args *args,
const char *list_name, int index,
struct gpio_desc *desc, int flags,
- bool add_index, struct udevice *dev)
+ bool add_index, struct udevice *gpio_dev)
{
- desc->dev = dev;
+ desc->dev = gpio_dev;
desc->offset = 0;
desc->flags = 0;
if (ret)
@@ -771,7 +814,8 @@ static int gpio_request_tail(int ret, const char *nodename,
ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
&desc->dev);
if (ret) {
- debug("%s: uclass_get_device_by_ofnode failed\n", __func__);
+ debug("%s: uclass_get_device_by_ofnode failed\n",
+ __func__);
goto err;
}
}
@@ -989,10 +1033,8 @@ int gpio_dev_request_index(struct udevice *dev, const char *nodename,
static int gpio_post_bind(struct udevice *dev)
{
-#if defined(CONFIG_DM_GPIO_HOG)
struct udevice *child;
ofnode node;
-#endif
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct dm_gpio_ops *ops = (struct dm_gpio_ops *)device_get_ops(dev);
@@ -1024,16 +1066,21 @@ static int gpio_post_bind(struct udevice *dev)
}
#endif
-#if defined(CONFIG_DM_GPIO_HOG)
- dev_for_each_subnode(node, dev) {
- if (ofnode_read_bool(node, "gpio-hog")) {
- const char *name = ofnode_get_name(node);
-
- device_bind_driver_to_node(dev, "gpio_hog", name,
- node, &child);
+ if (IS_ENABLED(CONFIG_GPIO_HOG)) {
+ dev_for_each_subnode(node, dev) {
+ if (ofnode_read_bool(node, "gpio-hog")) {
+ const char *name = ofnode_get_name(node);
+ int ret;
+
+ ret = device_bind_driver_to_node(dev,
+ "gpio_hog",
+ name, node,
+ &child);
+ if (ret)
+ return ret;
+ }
}
}
-#endif
return 0;
}
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 37f71e5708..d6cf18744f 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -352,9 +352,10 @@ int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc);
* gpio_hog_lookup_name() - Look up a named GPIO and return the gpio descr.
*
* @name: Name to look up
- * @return: Returns gpio_desc for gpio
+ * @desc: Returns GPIO description, on success, else NULL
+ * @return: Returns 0 if OK, else -ENODEV
*/
-struct gpio_desc *gpio_hog_lookup_name(const char *name);
+int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc);
/**
* gpio_hog_probe_all() - probe all gpio devices with
@@ -523,12 +524,13 @@ int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
* gpio_dev_request_index() - request single GPIO from gpio device
*
* @dev: GPIO device
- * @nodename: Name of node
+ * @nodename: Name of node for which gpio gets requested, used
+ * for the gpio label name
* @list_name: Name of GPIO list (e.g. "board-id-gpios")
* @index: Index number of the GPIO in that list use request (0=first)
* @flags: GPIOD_* flags
- * @dtflags: GPIO flags read from DT
- * @desc: GPIO descriotor filled from this function
+ * @dtflags: GPIO flags read from DT defined see GPIOD_*
+ * @desc: returns GPIO descriptor filled from this function
* @return: return value from gpio_request_tail()
*/
int gpio_dev_request_index(struct udevice *dev, const char *nodename,
--
2.27.0
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