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pinctrl: bcm2835: Add support for generic pinctrl binding 

To keep driver up to date we add generic pinctrl binding support, which
covers the features used in this driver and has additional node properties
that this SoC has compatibility, so enabling future implementations of
these properties without the need to create new node properties in the
device trees.

The logic of this change maintain the old brcm legacy binding support in
order to keep the ABI stable.

Signed-off-by: Matheus Castello <matheus@castello.eng.br>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Matheus Castello 2018-04-30 20:42:13 -04:00 committed by Linus Walleij
parent 73dacc3403
commit 0de704955e
2 changed files with 59 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/pinctrl/bcm/Kconfig
View File

@ -20,6 +20,7 @@ config PINCTRL_BCM2835
bool
select PINMUX
select PINCONF
select GENERIC_PINCONF
select GPIOLIB_IRQCHIP
config PINCTRL_IPROC_GPIO

79
drivers/pinctrl/bcm/pinctrl-bcm2835.c
View File

@ -36,11 +36,13 @@
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <dt-bindings/pinctrl/bcm2835.h>
#define MODULE_NAME "pinctrl-bcm2835"
#define BCM2835_NUM_GPIOS 54
@ -72,13 +74,9 @@
enum bcm2835_pinconf_param {
/* argument: bcm2835_pinconf_pull */
BCM2835_PINCONF_PARAM_PULL,
BCM2835_PINCONF_PARAM_PULL = (PIN_CONFIG_END + 1),
};
#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
struct bcm2835_pinctrl {
struct device *dev;
void __iomem *base;
@ -213,14 +211,6 @@ static const char * const bcm2835_gpio_groups[] = {
};
enum bcm2835_fsel {
BCM2835_FSEL_GPIO_IN = 0,
BCM2835_FSEL_GPIO_OUT = 1,
BCM2835_FSEL_ALT0 = 4,
BCM2835_FSEL_ALT1 = 5,
BCM2835_FSEL_ALT2 = 6,
BCM2835_FSEL_ALT3 = 7,
BCM2835_FSEL_ALT4 = 3,
BCM2835_FSEL_ALT5 = 2,
BCM2835_FSEL_COUNT = 8,
BCM2835_FSEL_MASK = 0x7,
};
@ -714,7 +704,7 @@ static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
configs = kzalloc(sizeof(*configs), GFP_KERNEL);
if (!configs)
return -ENOMEM;
configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
configs[0] = pinconf_to_config_packed(BCM2835_PINCONF_PARAM_PULL, pull);
map->type = PIN_MAP_TYPE_CONFIGS_PIN;
map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
@ -727,7 +717,7 @@ static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map, unsigned *num_maps)
struct pinctrl_map **map, unsigned int *num_maps)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
struct property *pins, *funcs, *pulls;
@ -736,6 +726,12 @@ static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
int i, err;
u32 pin, func, pull;
/* Check for generic binding in this node */
err = pinconf_generic_dt_node_to_map_all(pctldev, np, map, num_maps);
if (err || *num_maps)
return err;
/* Generic binding did not find anything continue with legacy parse */
pins = of_find_property(np, "brcm,pins", NULL);
if (!pins) {
dev_err(pc->dev, "%pOF: missing brcm,pins property\n", np);
@ -917,22 +913,10 @@ static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
return -ENOTSUPP;
}
static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *configs,
unsigned num_configs)
static void bcm2835_pull_config_set(struct bcm2835_pinctrl *pc,
unsigned int pin, unsigned int arg)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
enum bcm2835_pinconf_param param;
u16 arg;
u32 off, bit;
int i;
for (i = 0; i < num_configs; i++) {
param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
if (param != BCM2835_PINCONF_PARAM_PULL)
return -EINVAL;
off = GPIO_REG_OFFSET(pin);
bit = GPIO_REG_SHIFT(pin);
@ -948,6 +932,43 @@ static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
udelay(1);
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
}
static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *configs,
unsigned int num_configs)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
u32 param, arg;
int i;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
/* Set legacy brcm,pull */
case BCM2835_PINCONF_PARAM_PULL:
bcm2835_pull_config_set(pc, pin, arg);
break;
/* Set pull generic bindings */
case PIN_CONFIG_BIAS_DISABLE:
bcm2835_pull_config_set(pc, pin, BCM2835_PUD_OFF);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
bcm2835_pull_config_set(pc, pin, BCM2835_PUD_DOWN);
break;
case PIN_CONFIG_BIAS_PULL_UP:
bcm2835_pull_config_set(pc, pin, BCM2835_PUD_UP);
break;
default:
return -EINVAL;
} /* switch param type */
} /* for each config */
return 0;