Re: [PATCH 2/4] pinctrl: rockchip: Don't call pinctrl_gpio_direction_output() in pin_config_set()

From: Chris Zhong
Date: Mon Oct 20 2014 - 20:19:00 EST



On 10/20/2014 04:27 PM, Doug Anderson wrote:
The Rockchip pinctrl driver was calling
rockchip_gpio_direction_output() in the pin_config_set() callback.
This was just a shortcut for:
* rockchip_gpio_set()
* pinctrl_gpio_direction_output()

Unfortunately it's not so good to call pinctrl_gpio_direction_output()
from pin_config_set(). Specifically when initting hogs you'll get an
error.

Let's refactor a little so we can call
_rockchip_pmx_gpio_set_direction() directly.

Signed-off-by: Doug Anderson <dianders@xxxxxxxxxxxx>
---
drivers/pinctrl/pinctrl-rockchip.c | 42 +++++++++++++++++++++++---------------
1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 230d8f3..65efb88 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -856,22 +856,16 @@ static int rockchip_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
* leads to this function call (via the pinctrl_gpio_direction_{input|output}()
* function called from the gpiolib interface).
*/
-static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
- struct pinctrl_gpio_range *range,
- unsigned offset, bool input)
+static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *gc,
+ unsigned offset, bool input)
{
- struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
struct rockchip_pin_bank *bank;
- struct gpio_chip *chip;
int pin, ret;
+ unsigned long flags;
u32 data;
- chip = range->gc;
- bank = gc_to_pin_bank(chip);
- pin = offset - chip->base;
-
- dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
- offset, range->name, pin, input ? "input" : "output");
+ bank = gc_to_pin_bank(gc);
+ pin = offset - gc->base;
ret = rockchip_set_mux(bank, pin, RK_FUNC_GPIO);
if (ret < 0)
@@ -888,6 +882,22 @@ static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
return 0;
}
+static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset, bool input)
+{
+ struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+ struct gpio_chip *chip;
+ int pin;
+
+ chip = range->gc;
+ pin = offset - chip->base;
+ dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
+ offset, range->name, pin, input ? "input" : "output");
+
+ return _rockchip_pmx_gpio_set_direction(range->gc, offset, input);
+}
+
static const struct pinmux_ops rockchip_pmx_ops = {
.get_functions_count = rockchip_pmx_get_funcs_count,
.get_function_name = rockchip_pmx_get_func_name,
@@ -917,8 +927,7 @@ static bool rockchip_pinconf_pull_valid(struct rockchip_pin_ctrl *ctrl,
return false;
}
-static int rockchip_gpio_direction_output(struct gpio_chip *gc,
- unsigned offset, int value);
+static void rockchip_gpio_set(struct gpio_chip *gc, unsigned offset, int value);
static int rockchip_gpio_get(struct gpio_chip *gc, unsigned offset);
/* set the pin config settings for a specified pin */
@@ -959,9 +968,10 @@ static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
return rc;
break;
case PIN_CONFIG_OUTPUT:
- rc = rockchip_gpio_direction_output(&bank->gpio_chip,
- pin - bank->pin_base,
- arg);
+ rockchip_gpio_set(&bank->gpio_chip,
+ pin - bank->pin_base, arg);
+ rc = _rockchip_pmx_gpio_set_direction(&bank->gpio_chip,
+ pin - bank->pin_base, false);
if (rc)
return rc;
break;
Tested-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>
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