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pinctrl: single: Parse gpio details from dt

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Parse different gpio properties from dt as part of probe
function. This detail is required to enable pinctrl pad
later when gpio lines are requested.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: Bharat Gooty <bharat.gooty@broadcom.com>
Acked-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
This commit is contained in:
Bharat Gooty 2021-08-24 15:46:31 +05:30 committed by Tom Rini
parent 50c84208ad
commit 62f86c6a01
1 changed files with 52 additions and 0 deletions
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52
drivers/pinctrl/pinctrl-single.c
View file

@ -8,6 +8,7 @@
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/devres.h>
#include <dm/of_access.h>
#include <dm/pinctrl.h>
#include <linux/libfdt.h>
#include <linux/list.h>
@ -44,11 +45,27 @@ struct single_func {
unsigned int *pins;
};
/**
* struct single_gpiofunc_range - pin ranges with same mux value of gpio fun
* @offset: offset base of pins
* @npins: number pins with the same mux value of gpio function
* @gpiofunc: mux value of gpio function
* @node: list node
*/
struct single_gpiofunc_range {
u32 offset;
u32 npins;
u32 gpiofunc;
struct list_head node;
};
/**
* struct single_priv - private data
* @bits_per_pin: number of bits per pin
* @npins: number of selectable pins
* @pin_name: temporary buffer to store the pin name
* @functions: list pin functions
* @gpiofuncs: list gpio functions
*/
struct single_priv {
#if (IS_ENABLED(CONFIG_SANDBOX))
@ -58,6 +75,7 @@ struct single_priv {
unsigned int npins;
char pin_name[PINNAME_SIZE];
struct list_head functions;
struct list_head gpiofuncs;
};
/**
@ -454,6 +472,36 @@ static int single_get_pins_count(struct udevice *dev)
return priv->npins;
}
static int single_add_gpio_func(struct udevice *dev)
{
struct single_priv *priv = dev_get_priv(dev);
const char *propname = "pinctrl-single,gpio-range";
const char *cellname = "#pinctrl-single,gpio-range-cells";
struct single_gpiofunc_range *range;
struct ofnode_phandle_args gpiospec;
int ret, i;
for (i = 0; ; i++) {
ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), propname,
cellname, 0, i, &gpiospec);
/* Do not treat it as error. Only treat it as end condition. */
if (ret) {
ret = 0;
break;
}
range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
if (!range) {
ret = -ENOMEM;
break;
}
range->offset = gpiospec.args[0];
range->npins = gpiospec.args[1];
range->gpiofunc = gpiospec.args[2];
list_add_tail(&range->node, &priv->gpiofuncs);
}
return ret;
}
static int single_probe(struct udevice *dev)
{
struct single_pdata *pdata = dev_get_plat(dev);
@ -461,6 +509,7 @@ static int single_probe(struct udevice *dev)
u32 size;
INIT_LIST_HEAD(&priv->functions);
INIT_LIST_HEAD(&priv->gpiofuncs);
size = pdata->offset + pdata->width / BITS_PER_BYTE;
#if (CONFIG_IS_ENABLED(SANDBOX))
@ -483,6 +532,9 @@ static int single_probe(struct udevice *dev)
priv->npins *= (pdata->width / priv->bits_per_pin);
}
if (single_add_gpio_func(dev))
dev_dbg(dev, "gpio functions are not added\n");
dev_dbg(dev, "%d pins\n", priv->npins);
return 0;
}