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dm: gpio: Add a way to update flags 

It is convenient to be able to adjust some of the flags for a GPIO while
leaving others alone. Add a function for this.

Update dm_gpio_set_dir_flags() to make use of this.

Also update dm_gpio_set_value() to use this also, since this allows the
open-drain / open-source features to be implemented directly in the
driver, rather than using the uclass workaround.

Update the sandbox tests accordingly. This involves a lot of changes to
dm_test_gpio_opendrain_opensource() since we no-longer have the direciion
being reported differently depending on the open drain/open source flags.

Also update the STM32 drivers to let the uclass handle the active low/high
logic.

Drop the GPIOD_FLAGS_OUTPUT() macro which is no-longer used.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Tested-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Simon Glass 2021-02-04 21:22:03 -07:00 committed by Tom Rini
parent e87e86f31c
commit 7e0a96d559
5 changed files with 205 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/gpio/gpio-uclass.c
View File

@ -569,6 +569,7 @@ int dm_gpio_get_value(const struct gpio_desc *desc)
int dm_gpio_set_value(const struct gpio_desc *desc, int value)
{
const struct dm_gpio_ops *ops;
int ret;
ret = check_reserved(desc, "set_value");
@ -578,21 +579,33 @@ int dm_gpio_set_value(const struct gpio_desc *desc, int value)
if (desc->flags & GPIOD_ACTIVE_LOW)
value = !value;
/* GPIOD_ are directly managed by driver in set_flags */
ops = gpio_get_ops(desc->dev);
if (ops->set_flags) {
ulong flags = desc->flags;
if (value)
flags |= GPIOD_IS_OUT_ACTIVE;
else
flags &= ~GPIOD_IS_OUT_ACTIVE;
return ops->set_flags(desc->dev, desc->offset, flags);
}
/*
* Emulate open drain by not actively driving the line high or
* Emulate open source by not actively driving the line low
*/
if ((desc->flags & GPIOD_OPEN_DRAIN && value) ||
(desc->flags & GPIOD_OPEN_SOURCE && !value))
return gpio_get_ops(desc->dev)->direction_input(desc->dev,
desc->offset);
return ops->direction_input(desc->dev, desc->offset);
else if (desc->flags & GPIOD_OPEN_DRAIN ||
desc->flags & GPIOD_OPEN_SOURCE)
return gpio_get_ops(desc->dev)->direction_output(desc->dev,
desc->offset,
value);
return ops->direction_output(desc->dev, desc->offset, value);
ret = ops->set_value(desc->dev, desc->offset, value);
if (ret)
return ret;
gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value);
return 0;
}
@ -620,6 +633,17 @@ static int check_dir_flags(ulong flags)
return 0;
}
/**
* _dm_gpio_set_flags() - Send flags to the driver
*
* This uses the best available method to send the given flags to the driver.
* Note that if flags & GPIOD_ACTIVE_LOW, the driver sees the opposite value
* of GPIOD_IS_OUT_ACTIVE.
*
* @desc: GPIO description
* @flags: flags value to set
* @return 0 if OK, -ve on error
*/
static int _dm_gpio_set_flags(struct gpio_desc *desc, ulong flags)
{
struct udevice *dev = desc->dev;
@ -638,38 +662,52 @@ static int _dm_gpio_set_flags(struct gpio_desc *desc, ulong flags)
return ret;
}
/* If active low, invert the output state */
if ((flags & (GPIOD_IS_OUT | GPIOD_ACTIVE_LOW)) ==
(GPIOD_IS_OUT | GPIOD_ACTIVE_LOW))
flags ^= GPIOD_IS_OUT_ACTIVE;
/* GPIOD_ are directly managed by driver in set_flags */
if (ops->set_flags) {
ret = ops->set_flags(dev, desc->offset, flags);
} else {
if (flags & GPIOD_IS_OUT) {
ret = ops->direction_output(dev, desc->offset,
GPIOD_FLAGS_OUTPUT(flags));
bool value = flags & GPIOD_IS_OUT_ACTIVE;
ret = ops->direction_output(dev, desc->offset, value);
} else if (flags & GPIOD_IS_IN) {
ret = ops->direction_input(dev, desc->offset);
}
}
/* save the flags also in descriptor */
if (!ret)
desc->flags = flags;
return ret;
}
int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
int dm_gpio_clrset_flags(struct gpio_desc *desc, ulong clr, ulong set)
{
ulong flags;
int ret;
ret = check_reserved(desc, "set_dir_flags");
if (ret)
return ret;
/* combine the requested flags (for IN/OUT) and the descriptor flags */
flags |= desc->flags;
ret = _dm_gpio_set_flags(desc, flags);
flags = (desc->flags & ~clr) | set;
return ret;
ret = _dm_gpio_set_flags(desc, flags);
if (ret)
return ret;
/* save the flags also in descriptor */
desc->flags = flags;
return 0;
}
int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
{
/* combine the requested flags (for IN/OUT) and the descriptor flags */
return dm_gpio_clrset_flags(desc, GPIOD_MASK_DIR, flags);
}
int dm_gpio_set_dir(struct gpio_desc *desc)
@ -1011,7 +1049,10 @@ static int gpio_request_tail(int ret, const char *nodename,
debug("%s: dm_gpio_requestf failed\n", __func__);
goto err;
}
ret = dm_gpio_set_dir_flags(desc, flags);
/* Keep any direction flags provided by the devicetree */
ret = dm_gpio_set_dir_flags(desc,
flags | (desc->flags & GPIOD_MASK_DIR));
if (ret) {
debug("%s: dm_gpio_set_dir failed\n", __func__);
goto err;

3
drivers/gpio/stm32_gpio.c
View File

@ -203,12 +203,13 @@ static int stm32_gpio_set_flags(struct udevice *dev, unsigned int offset,
return idx;
if (flags & GPIOD_IS_OUT) {
int value = GPIOD_FLAGS_OUTPUT(flags);
bool value = flags & GPIOD_IS_OUT_ACTIVE;
if (flags & GPIOD_OPEN_DRAIN)
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
else
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
writel(BSRR_BIT(idx, value), &regs->bsrr);

5
drivers/pinctrl/pinctrl-stmfx.c
View File

@ -169,6 +169,8 @@ static int stmfx_gpio_set_flags(struct udevice *dev, unsigned int offset,
int ret = -ENOTSUPP;
if (flags & GPIOD_IS_OUT) {
bool value = flags & GPIOD_IS_OUT_ACTIVE;
if (flags & GPIOD_OPEN_SOURCE)
return -ENOTSUPP;
if (flags & GPIOD_OPEN_DRAIN)
@ -177,8 +179,7 @@ static int stmfx_gpio_set_flags(struct udevice *dev, unsigned int offset,
ret = stmfx_conf_set_type(dev, offset, 1);
if (ret)
return ret;
ret = stmfx_gpio_direction_output(dev, offset,
GPIOD_FLAGS_OUTPUT(flags));
ret = stmfx_gpio_direction_output(dev, offset, value);
} else if (flags & GPIOD_IS_IN) {
ret = stmfx_gpio_direction_input(dev, offset);
if (ret)

31
include/asm-generic/gpio.h
View File

@ -128,6 +128,12 @@ struct gpio_desc {
#define GPIOD_PULL_UP BIT(7) /* GPIO has pull-up enabled */
#define GPIOD_PULL_DOWN BIT(8) /* GPIO has pull-down enabled */
/* Flags for updating the above */
#define GPIOD_MASK_DIR (GPIOD_IS_OUT | GPIOD_IS_IN | \
GPIOD_IS_OUT_ACTIVE)
#define GPIOD_MASK_DSTYPE (GPIOD_OPEN_DRAIN | GPIOD_OPEN_SOURCE)
#define GPIOD_MASK_PULL (GPIOD_PULL_UP | GPIOD_PULL_DOWN)
uint offset; /* GPIO offset within the device */
/*
* We could consider adding the GPIO label in here. Possibly we could
@ -135,12 +141,6 @@ struct gpio_desc {
*/
};
/* helper to compute the value of the gpio output */
#define GPIOD_FLAGS_OUTPUT_MASK (GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE)
#define GPIOD_FLAGS_OUTPUT(flags) \
(((((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_IS_OUT_ACTIVE) || \
(((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_ACTIVE_LOW)))
/**
* dm_gpio_is_valid() - Check if a GPIO is valid
*
@ -668,6 +668,25 @@ int dm_gpio_set_value(const struct gpio_desc *desc, int value);
*/
int dm_gpio_set_dir(struct gpio_desc *desc);
/**
* dm_gpio_clrset_flags() - Update flags
*
* This updates the flags as directled. Note that desc->flags is updated by this
* function on success. If any changes cannot be made, best efforts are made.
*
* By use of @clr and @set any of flags can be individually updated, or left
* alone
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
* @clr: Flags to clear (GPIOD_...)
* @set: Flags to set (GPIOD_...)
* @return 0 if OK, -EINVAL if the flags had obvious conflicts,
* -ERECALLCONFLICT if there was a non-obvious hardware conflict when attempting
* to set the flags
*/
int dm_gpio_clrset_flags(struct gpio_desc *desc, ulong clr, ulong set);
/**
* dm_gpio_set_dir_flags() - Set direction using description and added flags
*

134
test/dm/gpio.c
View File

@ -178,15 +178,15 @@ static int dm_test_gpio_opendrain_opensource(struct unit_test_state *uts)
ut_asserteq(GPIOD_IS_OUT | GPIOD_OPEN_DRAIN,
sandbox_gpio_get_flags(gpio_c, 0));
/* Set it as output high, should become an input */
/* Set it as output high */
ut_assertok(dm_gpio_set_value(&desc_list[0], 1));
ut_assertok(gpio_get_status(gpio_c, 0, buf, sizeof(buf)));
ut_asserteq_str("c0: input: 0 [x] a-test.test3-gpios0", buf);
ut_asserteq(GPIOD_IS_OUT | GPIOD_OPEN_DRAIN | GPIOD_IS_OUT_ACTIVE,
sandbox_gpio_get_flags(gpio_c, 0));
/* Set it as output low, should become output low */
/* Set it as output low */
ut_assertok(dm_gpio_set_value(&desc_list[0], 0));
ut_assertok(gpio_get_status(gpio_c, 0, buf, sizeof(buf)));
ut_asserteq_str("c0: output: 0 [x] a-test.test3-gpios0", buf);
ut_asserteq(GPIOD_IS_OUT | GPIOD_OPEN_DRAIN,
sandbox_gpio_get_flags(gpio_c, 0));
/* GPIO 1 is (GPIO_OUT|GPIO_OPEN_SOURCE) */
ut_asserteq(GPIOD_IS_OUT | GPIOD_OPEN_SOURCE,
@ -197,13 +197,21 @@ static int dm_test_gpio_opendrain_opensource(struct unit_test_state *uts)
ut_assertok(gpio_get_status(gpio_c, 1, buf, sizeof(buf)));
ut_asserteq_str("c1: output: 1 [x] a-test.test3-gpios1", buf);
/* Set it as output low, should become an input */
/* Set it as output low */
ut_assertok(dm_gpio_set_value(&desc_list[1], 0));
ut_assertok(gpio_get_status(gpio_c, 1, buf, sizeof(buf)));
ut_asserteq_str("c1: input: 1 [x] a-test.test3-gpios1", buf);
ut_asserteq(GPIOD_IS_OUT | GPIOD_OPEN_SOURCE,
sandbox_gpio_get_flags(gpio_c, 1));
/* GPIO 6 is (GPIO_ACTIVE_LOW|GPIO_OUT|GPIO_OPEN_DRAIN) */
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_DRAIN,
ut_assertok(gpio_get_status(gpio_c, 1, buf, sizeof(buf)));
ut_asserteq_str("c1: output: 0 [x] a-test.test3-gpios1", buf);
/*
* GPIO 6 is (GPIO_ACTIVE_LOW|GPIO_OUT|GPIO_OPEN_DRAIN). Looking at it
* directlt from the driver, we get GPIOD_IS_OUT_ACTIVE also, since it
* is active low
*/
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_DRAIN |
GPIOD_IS_OUT_ACTIVE,
sandbox_gpio_get_flags(gpio_c, 6));
/* Set it as output high, should become output low */
@ -211,19 +219,21 @@ static int dm_test_gpio_opendrain_opensource(struct unit_test_state *uts)
ut_assertok(gpio_get_status(gpio_c, 6, buf, sizeof(buf)));
ut_asserteq_str("c6: output: 0 [x] a-test.test3-gpios6", buf);
/* Set it as output low, should become an input */
/* Set it as output low */
ut_assertok(dm_gpio_set_value(&desc_list[6], 0));
ut_assertok(gpio_get_status(gpio_c, 6, buf, sizeof(buf)));
ut_asserteq_str("c6: input: 0 [x] a-test.test3-gpios6", buf);
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_DRAIN |
GPIOD_IS_OUT_ACTIVE,
sandbox_gpio_get_flags(gpio_c, 6));
/* GPIO 7 is (GPIO_ACTIVE_LOW|GPIO_OUT|GPIO_OPEN_SOURCE) */
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_SOURCE,
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_SOURCE |
GPIOD_IS_OUT_ACTIVE,
sandbox_gpio_get_flags(gpio_c, 7));
/* Set it as output high, should become an input */
/* Set it as output high */
ut_assertok(dm_gpio_set_value(&desc_list[7], 1));
ut_assertok(gpio_get_status(gpio_c, 7, buf, sizeof(buf)));
ut_asserteq_str("c7: input: 0 [x] a-test.test3-gpios7", buf);
ut_asserteq(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT | GPIOD_OPEN_SOURCE,
sandbox_gpio_get_flags(gpio_c, 7));
/* Set it as output low, should become output high */
ut_assertok(dm_gpio_set_value(&desc_list[7], 0));
@ -582,3 +592,91 @@ static int dm_test_gpio_devm(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_gpio_devm, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
static int dm_test_clrset_flags(struct unit_test_state *uts)
{
struct gpio_desc desc;
struct udevice *dev;
ulong flags;
ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
ut_asserteq_str("a-test", dev->name);
ut_assertok(gpio_request_by_name(dev, "test-gpios", 1, &desc, 0));
ut_assertok(dm_gpio_clrset_flags(&desc, GPIOD_MASK_DIR, GPIOD_IS_OUT));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_OUT, flags);
ut_asserteq(GPIOD_IS_OUT, desc.flags);
ut_asserteq(0, sandbox_gpio_get_value(desc.dev, desc.offset));
ut_assertok(dm_gpio_clrset_flags(&desc, 0, GPIOD_IS_OUT_ACTIVE));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE, flags);
ut_asserteq(GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE, desc.flags);
ut_asserteq(1, sandbox_gpio_get_value(desc.dev, desc.offset));
ut_asserteq(1, dm_gpio_get_value(&desc));
ut_assertok(dm_gpio_clrset_flags(&desc, GPIOD_MASK_DIR, GPIOD_IS_IN));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_IN, flags & GPIOD_MASK_DIR);
ut_asserteq(GPIOD_IS_IN, desc.flags & GPIOD_MASK_DIR);
ut_assertok(dm_gpio_clrset_flags(&desc, GPIOD_MASK_PULL,
GPIOD_PULL_UP));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_IN | GPIOD_PULL_UP, flags);
ut_asserteq(GPIOD_IS_IN | GPIOD_PULL_UP, desc.flags);
/* Check we cannot set both PULL_UP and PULL_DOWN */
ut_asserteq(-EINVAL, dm_gpio_clrset_flags(&desc, 0, GPIOD_PULL_DOWN));
return 0;
}
DM_TEST(dm_test_clrset_flags, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
/* Check that an active-low GPIO works as expected */
static int dm_test_clrset_flags_invert(struct unit_test_state *uts)
{
struct gpio_desc desc;
struct udevice *dev;
ulong flags;
ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
ut_asserteq_str("a-test", dev->name);
ut_assertok(gpio_request_by_name(dev, "test-gpios", 1, &desc,
GPIOD_IS_OUT | GPIOD_ACTIVE_LOW));
/*
* From this size we see it as 0 (active low), but the sandbox driver
* sees the pin value high
*/
ut_asserteq(0, dm_gpio_get_value(&desc));
ut_asserteq(1, sandbox_gpio_get_value(desc.dev, desc.offset));
ut_assertok(dm_gpio_set_value(&desc, 1));
ut_asserteq(1, dm_gpio_get_value(&desc));
ut_asserteq(0, sandbox_gpio_get_value(desc.dev, desc.offset));
/* Do the same with dm_gpio_clrset_flags() */
ut_assertok(dm_gpio_clrset_flags(&desc, GPIOD_IS_OUT_ACTIVE, 0));
ut_asserteq(0, dm_gpio_get_value(&desc));
ut_asserteq(1, sandbox_gpio_get_value(desc.dev, desc.offset));
ut_assertok(dm_gpio_clrset_flags(&desc, 0, GPIOD_IS_OUT_ACTIVE));
ut_asserteq(1, dm_gpio_get_value(&desc));
ut_asserteq(0, sandbox_gpio_get_value(desc.dev, desc.offset));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_OUT | GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE,
flags);
ut_asserteq(GPIOD_IS_OUT | GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE,
desc.flags);
ut_assertok(dm_gpio_clrset_flags(&desc, GPIOD_IS_OUT_ACTIVE, 0));
ut_assertok(dm_gpio_get_flags(&desc, &flags));
ut_asserteq(GPIOD_IS_OUT | GPIOD_ACTIVE_LOW, flags);
ut_asserteq(GPIOD_IS_OUT | GPIOD_ACTIVE_LOW, desc.flags);
return 0;
}
DM_TEST(dm_test_clrset_flags_invert, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);