* [RFC v1 0/4] generic pinmux dt_node_to_map implementation
@ 2026-05-06 9:57 Conor Dooley
2026-05-06 9:57 ` [RFC v1 1/4] pinctrl: generic: change signature of pinctrl_generic_to_map() to pass void data Conor Dooley
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Conor Dooley @ 2026-05-06 9:57 UTC (permalink / raw)
To: Linus Walleij
Cc: conor, Conor Dooley, Yixun Lan, Troy Mitchell, linux-gpio,
linux-kernel, linux-riscv, spacemit
From: Conor Dooley <conor.dooley@microchip.com>
Hey Linus,
Whipped this up last week, at to a first glance it appears to work,
although the spacemit platform I've used to implement this has very
limited in-tree use of pinctrl so it is hard to be sure.
What I don't love though is how similar the functions
pinctrl_generic_pins_function_dt_node_to_map() and
pinctrl_generic_pinmux_dt_node_to_map() are - essentially identical
other than which function they in turn call.
Basically, I wanna know if you think that that is acceptable, or if
you'd rather see something that's totally generic between the two
and figures out which foo_dt_subnode_to_map() function to call*,
or convert pinctrl_generic_pins_function_dt_node_to_map() and
pinctrl_generic_pinmux_dt_node_to_map() to wrappers that pass a function
pointer of the appropriate foo_dt_subnode_to_map() to a shared node
parsing function, or some third option that I have not considered.
If you try to apply this, it's on top of Frank's mux series. It's also
here if any of the spacemit-ters want to look at what I did to their
driver:
https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/log/?h=spacemit-pinctrl
None of the patches have real commit messages due to this being RFC :)
Cheers,
Conor.
* pinmux/pins + functions/groups + functions I think are the only
really valid combinations here, so it wouldn't be too difficult to
arrange that logic.
CC: Linus Walleij <linusw@kernel.org>
CC: Yixun Lan <dlan@kernel.org>
CC: Conor Dooley <conor.dooley@microchip.com>
CC: Troy Mitchell <troy.mitchell@linux.spacemit.com>
CC: linux-gpio@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-riscv@lists.infradead.org
CC: spacemit@lists.linux.dev
Conor Dooley (4):
pinctrl: generic: change signature of pinctrl_generic_to_map() to pass
void data
pinctrl: add new generic groups/function creation function for pinmux
pinctrl: spacemit: delete check_power()
pinctrl: spacemit: move over to generic pinmux dt_node_to_map
implementation
drivers/pinctrl/pinconf.h | 20 +++-
drivers/pinctrl/pinctrl-generic.c | 139 +++++++++++++++++++++++++-
drivers/pinctrl/spacemit/pinctrl-k1.c | 70 +++----------
3 files changed, 164 insertions(+), 65 deletions(-)
--
2.53.0
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^ permalink raw reply [flat|nested] 5+ messages in thread
* [RFC v1 1/4] pinctrl: generic: change signature of pinctrl_generic_to_map() to pass void data
2026-05-06 9:57 [RFC v1 0/4] generic pinmux dt_node_to_map implementation Conor Dooley
@ 2026-05-06 9:57 ` Conor Dooley
2026-05-06 9:57 ` [RFC v1 2/4] pinctrl: add new generic groups/function creation function for pinmux Conor Dooley
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Conor Dooley @ 2026-05-06 9:57 UTC (permalink / raw)
To: Linus Walleij
Cc: conor, Conor Dooley, Yixun Lan, Troy Mitchell, linux-gpio,
linux-kernel, linux-riscv, spacemit
From: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
drivers/pinctrl/pinconf.h | 6 ++----
drivers/pinctrl/pinctrl-generic.c | 5 ++---
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/pinctrl/pinconf.h b/drivers/pinctrl/pinconf.h
index 83f2d00c732e1..5d99fef27657f 100644
--- a/drivers/pinctrl/pinconf.h
+++ b/drivers/pinctrl/pinconf.h
@@ -171,8 +171,7 @@ int pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *pare
struct device_node *np, struct pinctrl_map **maps,
unsigned int *num_maps, unsigned int *num_reserved_maps,
const char **group_name, unsigned int ngroups,
- const char **functions, unsigned int *pins,
- unsigned int npins);
+ void *data, unsigned int *pins, unsigned int npins);
#else
static inline int
pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
@@ -188,8 +187,7 @@ pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *parent,
struct device_node *np, struct pinctrl_map **maps,
unsigned int *num_maps, unsigned int *num_reserved_maps,
const char **group_name, unsigned int ngroups,
- const char **functions, unsigned int *pins,
- unsigned int npins)
+ void *data, unsigned int *pins, unsigned int npins)
{
return -ENOTSUPP;
}
diff --git a/drivers/pinctrl/pinctrl-generic.c b/drivers/pinctrl/pinctrl-generic.c
index 76670aef62da4..6a13fd4eea65b 100644
--- a/drivers/pinctrl/pinctrl-generic.c
+++ b/drivers/pinctrl/pinctrl-generic.c
@@ -21,8 +21,7 @@ int pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *pare
struct device_node *np, struct pinctrl_map **maps,
unsigned int *num_maps, unsigned int *num_reserved_maps,
const char **group_names, unsigned int ngroups,
- const char **functions, unsigned int *pins,
- unsigned int npins)
+ void *data, unsigned int *pins, unsigned int npins)
{
struct device *dev = pctldev->dev;
unsigned int num_configs;
@@ -45,7 +44,7 @@ int pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *pare
if (ret < 0)
return ret;
- ret = pinctrl_generic_add_group(pctldev, group_name, pins, npins, functions);
+ ret = pinctrl_generic_add_group(pctldev, group_name, pins, npins, data);
if (ret < 0)
return dev_err_probe(dev, ret, "failed to add group %s: %d\n",
group_name, ret);
--
2.53.0
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [RFC v1 2/4] pinctrl: add new generic groups/function creation function for pinmux
2026-05-06 9:57 [RFC v1 0/4] generic pinmux dt_node_to_map implementation Conor Dooley
2026-05-06 9:57 ` [RFC v1 1/4] pinctrl: generic: change signature of pinctrl_generic_to_map() to pass void data Conor Dooley
@ 2026-05-06 9:57 ` Conor Dooley
2026-05-06 9:57 ` [RFC v1 3/4] pinctrl: spacemit: delete check_power() Conor Dooley
2026-05-06 9:57 ` [RFC v1 4/4] pinctrl: spacemit: move over to generic pinmux dt_node_to_map implementation Conor Dooley
3 siblings, 0 replies; 5+ messages in thread
From: Conor Dooley @ 2026-05-06 9:57 UTC (permalink / raw)
To: Linus Walleij
Cc: conor, Conor Dooley, Yixun Lan, Troy Mitchell, linux-gpio,
linux-kernel, linux-riscv, spacemit
From: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
drivers/pinctrl/pinconf.h | 14 ++++
drivers/pinctrl/pinctrl-generic.c | 134 ++++++++++++++++++++++++++++++
2 files changed, 148 insertions(+)
diff --git a/drivers/pinctrl/pinconf.h b/drivers/pinctrl/pinconf.h
index 5d99fef27657f..30c42d81e8829 100644
--- a/drivers/pinctrl/pinconf.h
+++ b/drivers/pinctrl/pinconf.h
@@ -167,6 +167,11 @@ int pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
struct pinctrl_map **maps,
unsigned int *num_maps);
+int pinctrl_generic_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **maps,
+ unsigned int *num_maps);
+
int pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *parent,
struct device_node *np, struct pinctrl_map **maps,
unsigned int *num_maps, unsigned int *num_reserved_maps,
@@ -182,6 +187,15 @@ pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
return -ENOTSUPP;
}
+static inline int
+pinctrl_generic_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **maps,
+ unsigned int *num_maps)
+{
+ return -ENOTSUPP;
+}
+
static inline int
pinctrl_generic_to_map(struct pinctrl_dev *pctldev, struct device_node *parent,
struct device_node *np, struct pinctrl_map **maps,
diff --git a/drivers/pinctrl/pinctrl-generic.c b/drivers/pinctrl/pinctrl-generic.c
index 6a13fd4eea65b..69df211f6b964 100644
--- a/drivers/pinctrl/pinctrl-generic.c
+++ b/drivers/pinctrl/pinctrl-generic.c
@@ -202,3 +202,137 @@ int pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_pins_function_dt_node_to_map);
+
+
+static int pinctrl_generic_pinmux_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *parent,
+ struct device_node *np,
+ struct pinctrl_map **maps,
+ unsigned int *num_maps,
+ unsigned int *num_reserved_maps,
+ const char **group_names,
+ unsigned int ngroups)
+{
+ struct device *dev = pctldev->dev;
+ unsigned int *pins, *muxes;
+ int npins, ret;
+
+ npins = of_property_count_u32_elems(np, "pinmux");
+
+ if (npins < 1) {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn %d\n",
+ parent, np, npins);
+ return npins;
+ }
+
+ pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+
+ muxes = devm_kcalloc(dev, npins, sizeof(*muxes), GFP_KERNEL);
+ if (!muxes)
+ return -ENOMEM;
+
+ for (int i = 0; i < npins; i++) {
+ unsigned int pinmux;
+
+ ret = of_property_read_u32_index(np, "pinmux", i, &pinmux);
+ if (ret)
+ return ret;
+
+ pins[i] = pinmux >> 16;
+ muxes[i] = pinmux & GENMASK(15, 0);
+ }
+
+ return pinctrl_generic_to_map(pctldev, parent, np, maps, num_maps,
+ num_reserved_maps, group_names, ngroups,
+ muxes, pins, npins);
+}
+
+/*
+ * For platforms that do not define groups or functions in the driver, but
+ * instead use the devicetree to describe them. This function will, unlike
+ * pinconf_generic_dt_node_to_map() etc which rely on driver defined groups
+ * and functions, create them in addition to parsing pinconf properties and
+ * adding mappings.
+ *
+ * It assumes that the upper 16 bits of the pinmux items contain the pin
+ * and the lower 16 the mux setting.
+ */
+int pinctrl_generic_pinmux_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **maps,
+ unsigned int *num_maps)
+{
+ struct device *dev = pctldev->dev;
+ struct device_node *child_np;
+ const char **group_names;
+ unsigned int num_reserved_maps = 0;
+ int ngroups = 0;
+ int ret;
+
+ *maps = NULL;
+ *num_maps = 0;
+
+ /*
+ * Check if this is actually the pinmux node, or a parent containing
+ * multiple pinmux nodes.
+ */
+ if (!of_property_present(np, "pinmux"))
+ goto parent;
+
+ group_names = devm_kcalloc(dev, 1, sizeof(*group_names), GFP_KERNEL);
+ if (!group_names)
+ return -ENOMEM;
+
+ ret = pinctrl_generic_pinmux_dt_subnode_to_map(pctldev, np, np,
+ maps, num_maps,
+ &num_reserved_maps,
+ group_names,
+ ngroups);
+ if (ret) {
+ pinctrl_utils_free_map(pctldev, *maps, *num_maps);
+ return dev_err_probe(dev, ret, "error figuring out mappings for %s\n", np->name);
+ }
+
+ ret = pinmux_generic_add_function(pctldev, np->name, group_names, 1, NULL);
+ if (ret < 0) {
+ pinctrl_utils_free_map(pctldev, *maps, *num_maps);
+ return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
+ }
+
+ return 0;
+
+parent:
+ for_each_available_child_of_node(np, child_np)
+ ngroups += 1;
+
+ group_names = devm_kcalloc(dev, ngroups, sizeof(*group_names), GFP_KERNEL);
+ if (!group_names)
+ return -ENOMEM;
+
+ ngroups = 0;
+ for_each_available_child_of_node_scoped(np, child_np) {
+ ret = pinctrl_generic_pinmux_dt_subnode_to_map(pctldev, np, child_np,
+ maps, num_maps,
+ &num_reserved_maps,
+ group_names,
+ ngroups);
+ if (ret) {
+ pinctrl_utils_free_map(pctldev, *maps, *num_maps);
+ return dev_err_probe(dev, ret, "error figuring out mappings for %s\n",
+ np->name);
+ }
+
+ ngroups++;
+ }
+
+ ret = pinmux_generic_add_function(pctldev, np->name, group_names, ngroups, NULL);
+ if (ret < 0) {
+ pinctrl_utils_free_map(pctldev, *maps, *num_maps);
+ return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pinctrl_generic_pinmux_dt_node_to_map);
--
2.53.0
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [RFC v1 3/4] pinctrl: spacemit: delete check_power()
2026-05-06 9:57 [RFC v1 0/4] generic pinmux dt_node_to_map implementation Conor Dooley
2026-05-06 9:57 ` [RFC v1 1/4] pinctrl: generic: change signature of pinctrl_generic_to_map() to pass void data Conor Dooley
2026-05-06 9:57 ` [RFC v1 2/4] pinctrl: add new generic groups/function creation function for pinmux Conor Dooley
@ 2026-05-06 9:57 ` Conor Dooley
2026-05-06 9:57 ` [RFC v1 4/4] pinctrl: spacemit: move over to generic pinmux dt_node_to_map implementation Conor Dooley
3 siblings, 0 replies; 5+ messages in thread
From: Conor Dooley @ 2026-05-06 9:57 UTC (permalink / raw)
To: Linus Walleij
Cc: conor, Conor Dooley, Yixun Lan, Troy Mitchell, linux-gpio,
linux-kernel, linux-riscv, spacemit
From: Conor Dooley <conor.dooley@microchip.com>
AFAICT, this is pointless because generate_config performs this check
too.
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
drivers/pinctrl/spacemit/pinctrl-k1.c | 37 ---------------------------
1 file changed, 37 deletions(-)
diff --git a/drivers/pinctrl/spacemit/pinctrl-k1.c b/drivers/pinctrl/spacemit/pinctrl-k1.c
index 62cab6f6cd0a8..41d8a34bc386b 100644
--- a/drivers/pinctrl/spacemit/pinctrl-k1.c
+++ b/drivers/pinctrl/spacemit/pinctrl-k1.c
@@ -409,38 +409,6 @@ static inline u32 spacemit_get_drive_strength_mA(enum spacemit_pin_io_type type,
}
}
-static int spacemit_pctrl_check_power(struct pinctrl_dev *pctldev,
- struct device_node *dn,
- struct spacemit_pin_mux_config *pinmuxs,
- int num_pins, const char *grpname)
-{
- struct spacemit_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
- struct device *dev = pctrl->dev;
- enum spacemit_pin_io_type type;
- u32 power = 0, i;
-
- of_property_read_u32(dn, "power-source", &power);
-
- for (i = 0; i < num_pins; i++) {
- type = spacemit_to_pin_io_type(pinmuxs[i].pin);
-
- if (type != IO_TYPE_EXTERNAL)
- continue;
-
- switch (power) {
- case PIN_POWER_STATE_1V8:
- case PIN_POWER_STATE_3V3:
- break;
- default:
- dev_err(dev, "group %s has unsupported power\n",
- grpname);
- return -ENOTSUPP;
- }
- }
-
- return 0;
-}
-
static void spacemit_set_io_pwr_domain(struct spacemit_pinctrl *pctrl,
const struct spacemit_pin *spin,
const enum spacemit_pin_io_type type)
@@ -548,11 +516,6 @@ static int spacemit_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
return dev_err_probe(dev, -ENODEV, "failed to get pin %d\n", pins[i]);
}
- ret = spacemit_pctrl_check_power(pctldev, child, pinmuxs,
- npins, grpname);
- if (ret < 0)
- return ret;
-
map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
map[nmaps].data.mux.function = np->name;
map[nmaps].data.mux.group = grpname;
--
2.53.0
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [RFC v1 4/4] pinctrl: spacemit: move over to generic pinmux dt_node_to_map implementation
2026-05-06 9:57 [RFC v1 0/4] generic pinmux dt_node_to_map implementation Conor Dooley
` (2 preceding siblings ...)
2026-05-06 9:57 ` [RFC v1 3/4] pinctrl: spacemit: delete check_power() Conor Dooley
@ 2026-05-06 9:57 ` Conor Dooley
3 siblings, 0 replies; 5+ messages in thread
From: Conor Dooley @ 2026-05-06 9:57 UTC (permalink / raw)
To: Linus Walleij
Cc: conor, Conor Dooley, Yixun Lan, Troy Mitchell, linux-gpio,
linux-kernel, linux-riscv, spacemit
From: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
drivers/pinctrl/spacemit/pinctrl-k1.c | 33 ++++++++++-----------------
1 file changed, 12 insertions(+), 21 deletions(-)
diff --git a/drivers/pinctrl/spacemit/pinctrl-k1.c b/drivers/pinctrl/spacemit/pinctrl-k1.c
index 41d8a34bc386b..c90b6ccfce2ea 100644
--- a/drivers/pinctrl/spacemit/pinctrl-k1.c
+++ b/drivers/pinctrl/spacemit/pinctrl-k1.c
@@ -114,11 +114,6 @@ struct spacemit_pinctrl_data {
const struct spacemit_pinctrl_dconf *dconf;
};
-struct spacemit_pin_mux_config {
- const struct spacemit_pin *pin;
- u32 config;
-};
-
/* map pin id to pinctrl register offset, refer MFPR definition */
static unsigned int spacemit_k1_pin_to_offset(unsigned int pin)
{
@@ -474,7 +469,6 @@ static int spacemit_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
ngroups = 0;
guard(mutex)(&pctrl->mutex);
for_each_available_child_of_node_scoped(np, child) {
- struct spacemit_pin_mux_config *pinmuxs;
unsigned int config, *pins;
int i, npins;
@@ -497,10 +491,6 @@ static int spacemit_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
if (!pins)
return -ENOMEM;
- pinmuxs = devm_kcalloc(dev, npins, sizeof(*pinmuxs), GFP_KERNEL);
- if (!pinmuxs)
- return -ENOMEM;
-
for (i = 0; i < npins; i++) {
ret = of_property_read_u32_index(child, "pinmux",
i, &config);
@@ -509,11 +499,6 @@ static int spacemit_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
return -EINVAL;
pins[i] = spacemit_dt_get_pin(config);
- pinmuxs[i].config = config;
- pinmuxs[i].pin = spacemit_get_pin(pctrl, pins[i]);
-
- if (!pinmuxs[i].pin)
- return dev_err_probe(dev, -ENODEV, "failed to get pin %d\n", pins[i]);
}
map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
@@ -522,7 +507,7 @@ static int spacemit_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
nmaps += 1;
ret = pinctrl_generic_add_group(pctldev, grpname,
- pins, npins, pinmuxs);
+ pins, npins, &config);
if (ret < 0)
return dev_err_probe(dev, ret, "failed to add group %s: %d\n", grpname, ret);
@@ -559,7 +544,7 @@ static const struct pinctrl_ops spacemit_pctrl_ops = {
.get_group_name = pinctrl_generic_get_group_name,
.get_group_pins = pinctrl_generic_get_group_pins,
.pin_dbg_show = spacemit_pctrl_dbg_show,
- .dt_node_to_map = spacemit_pctrl_dt_node_to_map,
+ .dt_node_to_map = pinctrl_generic_pinmux_dt_node_to_map,
.dt_free_map = pinctrl_utils_free_map,
};
@@ -568,8 +553,8 @@ static int spacemit_pmx_set_mux(struct pinctrl_dev *pctldev,
{
struct spacemit_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
const struct group_desc *group;
- const struct spacemit_pin_mux_config *configs;
unsigned int i, mux;
+ unsigned int *configs;
void __iomem *reg;
group = pinctrl_generic_get_group(pctldev, gsel);
@@ -579,11 +564,17 @@ static int spacemit_pmx_set_mux(struct pinctrl_dev *pctldev,
configs = group->data;
for (i = 0; i < group->grp.npins; i++) {
- const struct spacemit_pin *spin = configs[i].pin;
- u32 value = configs[i].config;
+ const struct spacemit_pin *spin;
+ u32 value = configs[i];
+
+ spin = spacemit_get_pin(pctrl, group->grp.pins[i]);
+ if (!spin) {
+ dev_err(pctrl->dev, "Invalid pin %u\n", group->grp.pins[i]);
+ return -EINVAL;
+ }
reg = spacemit_pin_to_reg(pctrl, spin->pin);
- mux = spacemit_dt_get_pin_mux(value);
+ mux = value;
guard(raw_spinlock_irqsave)(&pctrl->lock);
value = readl_relaxed(reg) & ~PAD_MUX;
--
2.53.0
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^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-05-06 9:58 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-05-06 9:57 [RFC v1 0/4] generic pinmux dt_node_to_map implementation Conor Dooley
2026-05-06 9:57 ` [RFC v1 1/4] pinctrl: generic: change signature of pinctrl_generic_to_map() to pass void data Conor Dooley
2026-05-06 9:57 ` [RFC v1 2/4] pinctrl: add new generic groups/function creation function for pinmux Conor Dooley
2026-05-06 9:57 ` [RFC v1 3/4] pinctrl: spacemit: delete check_power() Conor Dooley
2026-05-06 9:57 ` [RFC v1 4/4] pinctrl: spacemit: move over to generic pinmux dt_node_to_map implementation Conor Dooley
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