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pinctrl: copy per-pin driver private data to struct pin_desc

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Currently, struct pinctrl_pin_desc can have per-pin driver private
data, but it is not copied to struct pin_desc.

For a driver with sparse pin space, for-loop search like below would
be necessary in order to get the driver-specific data for a desired
pin number.

  for (i = 0; i < pctldev->desc->npins; i++)
          if (pin_number == pctldev->desc->pins[i].number)
                  return pctldev->desc->pins[i].drv_data;

This is not efficient for a driver with a large number of pins.
So, copy the data to struct pin_desc when each pin is registered
for the faster radix tree lookup.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Masahiro Yamada 2016-05-25 14:09:31 +09:00 committed by Linus Walleij
parent cf9d994dcf
commit cd8f61f1e5
2 changed files with 14 additions and 10 deletions
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22
drivers/pinctrl/core.c
View File

@ -225,13 +225,14 @@ static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
}
static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
unsigned number, const char *name)
const struct pinctrl_pin_desc *pin)
{
struct pin_desc *pindesc;
pindesc = pin_desc_get(pctldev, number);
pindesc = pin_desc_get(pctldev, pin->number);
if (pindesc != NULL) {
dev_err(pctldev->dev, "pin %d already registered\n", number);
dev_err(pctldev->dev, "pin %d already registered\n",
pin->number);
return -EINVAL;
}
@ -245,10 +246,10 @@ static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
pindesc->pctldev = pctldev;
/* Copy basic pin info */
if (name) {
pindesc->name = name;
if (pin->name) {
pindesc->name = pin->name;
} else {
pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
if (pindesc->name == NULL) {
kfree(pindesc);
return -ENOMEM;
@ -256,9 +257,11 @@ static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
pindesc->dynamic_name = true;
}
radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
pindesc->drv_data = pin->drv_data;
radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
pr_debug("registered pin %d (%s) on %s\n",
number, pindesc->name, pctldev->desc->name);
pin->number, pindesc->name, pctldev->desc->name);
return 0;
}
@ -270,8 +273,7 @@ static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
int ret = 0;
for (i = 0; i < num_descs; i++) {
ret = pinctrl_register_one_pin(pctldev,
pins[i].number, pins[i].name);
ret = pinctrl_register_one_pin(pctldev, &pins[i]);
if (ret)
return ret;
}

2
drivers/pinctrl/core.h
View File

@ -134,6 +134,7 @@ struct pinctrl_setting {
* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
* datasheet or such
* @dynamic_name: if the name of this pin was dynamically allocated
* @drv_data: driver-defined per-pin data. pinctrl core does not touch this
* @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
* If non-zero, this pin is claimed by @owner. This field is an integer
* rather than a boolean, since pinctrl_get() might process multiple
@ -148,6 +149,7 @@ struct pin_desc {
struct pinctrl_dev *pctldev;
const char *name;
bool dynamic_name;
void *drv_data;
/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
unsigned mux_usecount;