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pinctrl: at91-pio4: Add support for pinctrl config subnodes

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Previously, in order for the `pinctrl-*` DT node properties
to be properly processed, the pinctrl's subnodes were limited
to only having the `pinmux` property as well as other additional
properties (slew-rate, bias-disable, etc.). Now, with this patch
the pinctrl driver is made to work similarly to the one from Linux.
It can now distinguish between one subnode and a subnode with multiple
subnodes.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
This commit is contained in:
Sergiu Moga 2022-09-01 17:22:42 +03:00 committed by Eugen Hristev
parent 2ed96a87d2
commit 7086defa04
1 changed files with 61 additions and 12 deletions
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73
drivers/pinctrl/pinctrl-at91-pio4.c
View file

@ -15,6 +15,7 @@
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/err.h>
#include <dm/uclass-internal.h>
#include <mach/atmel_pio4.h>
DECLARE_GLOBAL_DATA_PTR;
@ -151,12 +152,11 @@ static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
#define MAX_PINMUX_ENTRIES 40
static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
static int atmel_process_config_dev(struct udevice *dev, struct udevice *config)
{
struct atmel_pio4_plat *plat = dev_get_plat(dev);
struct atmel_pio4_port *bank_base;
const void *blob = gd->fdt_blob;
int node = dev_of_offset(config);
struct atmel_pio4_port *bank_base;
u32 offset, func, bank, line;
u32 cells[MAX_PINMUX_ENTRIES];
u32 i, conf;
@ -164,18 +164,17 @@ static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
conf = atmel_pinctrl_get_pinconf(config, plat);
count = fdtdec_get_int_array_count(blob, node, "pinmux",
/*
* The only case where this function returns a negative error value
* is when there is no "pinmux" property attached to this node
*/
count = fdtdec_get_int_array_count(gd->fdt_blob, node, "pinmux",
cells, ARRAY_SIZE(cells));
if (count < 0) {
printf("%s: bad pinmux array %d\n", __func__, count);
return -EINVAL;
}
if (count < 0)
return count;
if (count > MAX_PINMUX_ENTRIES) {
printf("%s: unsupported pinmux array count %d\n",
__func__, count);
if (count > MAX_PINMUX_ENTRIES)
return -EINVAL;
}
for (i = 0 ; i < count; i++) {
offset = ATMEL_GET_PIN_NO(cells[i]);
@ -195,6 +194,56 @@ static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
return 0;
}
static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
int node = dev_of_offset(config);
struct udevice *subconfig;
int subnode, subnode_count = 0, ret;
/*
* If this function returns a negative error code then that means
* that either the "pinmux" property of the node is missing, which is
* the case for pinctrl nodes that do not have all the pins with the
* same configuration and are split in multiple subnodes, or something
* else went wrong and we have to stop. For the latter case, it would
* mean that the node failed even though it has no subnodes.
*/
ret = atmel_process_config_dev(dev, config);
if (!ret)
return ret;
/*
* If we reach here, it means that the subnode pinctrl's DT has multiple
* subnodes. If it does not, then something else went wrong in the
* previous call to atmel_process_config_dev.
*/
fdt_for_each_subnode(subnode, gd->fdt_blob, node) {
/* Get subnode as an udevice */
ret = uclass_find_device_by_of_offset(UCLASS_PINCONFIG, subnode,
&subconfig);
if (ret)
return ret;
/*
* If this time the function returns an error code on a subnode
* then something is totally wrong so abort.
*/
ret = atmel_process_config_dev(dev, subconfig);
if (ret)
return ret;
subnode_count++;
}
/*
* If we somehow got here and we do not have any subnodes, abort.
*/
if (!subnode_count)
return -EINVAL;
return 0;
}
const struct pinctrl_ops atmel_pinctrl_ops = {
.set_state = atmel_pinctrl_set_state,
};