lkml.org 
[lkml]   [2016]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 4/9] pinctrl: sunxi: Deal with configless pins
Date
Even though the our binding had the assumption that the allwinner,pull and
allwinner,drive properties were optional, the code never took that into
account.

Fix that.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/pinctrl/sunxi/pinctrl-sunxi.c | 53 ++++++++++++++++++++--------
1 file changed, 39 insertions(+), 14 deletions(-)

diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 6f6f1e0011e2..2ee8d48ed5d3 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -218,20 +218,29 @@ static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node,
{
unsigned long *pinconfig;
unsigned int configlen = 0, idx = 0;
+ int ret;

if (sunxi_pctrl_has_drive_prop(node))
configlen++;
if (sunxi_pctrl_has_bias_prop(node))
configlen++;

+ /*
+ * If we don't have any configuration, bail out
+ */
+ if (!configlen)
+ return NULL;
+
pinconfig = kzalloc(configlen * sizeof(*pinconfig), GFP_KERNEL);
if (!pinconfig)
- return NULL;
+ return ERR_PTR(-ENOMEM);

if (sunxi_pctrl_has_drive_prop(node)) {
int drive = sunxi_pctrl_parse_drive_prop(node);
- if (drive < 0)
+ if (drive < 0) {
+ ret = drive;
goto err_free;
+ }

pinconfig[idx++] = pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
drive);
@@ -239,8 +248,10 @@ static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node,

if (sunxi_pctrl_has_bias_prop(node)) {
int pull = sunxi_pctrl_parse_bias_prop(node);
- if (pull < 0)
+ if (pull < 0) {
+ ret = pull;
goto err_free;
+ }

pinconfig[idx++] = pinconf_to_config_packed(pull, 0);
}
@@ -251,7 +262,7 @@ static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node,

err_free:
kfree(pinconfig);
- return NULL;
+ return ERR_PTR(ret);
}

static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
@@ -285,7 +296,10 @@ static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,

/*
* We have two maps for each pin: one for the function, one
- * for the configuration (bias, strength, etc)
+ * for the configuration (bias, strength, etc).
+ *
+ * We might be slightly overshooting, since we might not have
+ * any configuration.
*/
nmaps = npins * 2;
*map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
@@ -293,8 +307,8 @@ static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
return -ENOMEM;

pinconfig = sunxi_pctrl_build_pin_config(node, &configlen);
- if (!pinconfig) {
- ret = -EINVAL;
+ if (IS_ERR(pinconfig)) {
+ ret = PTR_ERR(pinconfig);
goto err_free_map;
}

@@ -321,15 +335,24 @@ static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,

i++;

- (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
- (*map)[i].data.configs.group_or_pin = group;
- (*map)[i].data.configs.configs = pinconfig;
- (*map)[i].data.configs.num_configs = configlen;
-
- i++;
+ if (pinconfig) {
+ (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
+ (*map)[i].data.configs.group_or_pin = group;
+ (*map)[i].data.configs.configs = pinconfig;
+ (*map)[i].data.configs.num_configs = configlen;
+ i++;
+ }
}

- *num_maps = nmaps;
+ *num_maps = i;
+
+ /*
+ * We know have the number of maps we need, we can resize our
+ * map array
+ */
+ *map = krealloc(*map, i * sizeof(struct pinctrl_map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;

return 0;

@@ -342,6 +365,8 @@ static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map,
unsigned num_maps)
{
+ unsigned long *pinconfig;
+
/* All the maps have the same pin config, free only the first one */
kfree(map[0].data.configs.configs);
kfree(map);
--
git-series 0.8.10
\
 
 \ /
  Last update: 2016-10-11 17:47    [W:0.192 / U:11.320 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site