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128 lines
3.4 KiB
128 lines
3.4 KiB
From e11dee2e98f8abc99ad5336796576a827853ccfa Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime.ripard@free-electrons.com>
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Date: Thu, 20 Oct 2016 15:49:02 +0200
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Subject: pinctrl: sunxi: Deal with configless pins
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Even though the our binding had the assumption that the allwinner,pull and
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allwinner,drive properties were optional, the code never took that into
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account.
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Fix that.
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Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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Acked-by: Chen-Yu Tsai <wens@csie.org>
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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---
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drivers/pinctrl/sunxi/pinctrl-sunxi.c | 51 +++++++++++++++++++++++++----------
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1 file changed, 37 insertions(+), 14 deletions(-)
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--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
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+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
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@@ -261,20 +261,29 @@ static unsigned long *sunxi_pctrl_build_
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{
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unsigned long *pinconfig;
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unsigned int configlen = 0, idx = 0;
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+ int ret;
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if (sunxi_pctrl_has_drive_prop(node))
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configlen++;
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if (sunxi_pctrl_has_bias_prop(node))
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configlen++;
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+ /*
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+ * If we don't have any configuration, bail out
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+ */
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+ if (!configlen)
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+ return NULL;
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+
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pinconfig = kzalloc(configlen * sizeof(*pinconfig), GFP_KERNEL);
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if (!pinconfig)
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- return NULL;
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+ return ERR_PTR(-ENOMEM);
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if (sunxi_pctrl_has_drive_prop(node)) {
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int drive = sunxi_pctrl_parse_drive_prop(node);
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- if (drive < 0)
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+ if (drive < 0) {
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+ ret = drive;
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goto err_free;
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+ }
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pinconfig[idx++] = pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
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drive);
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@@ -282,8 +291,10 @@ static unsigned long *sunxi_pctrl_build_
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if (sunxi_pctrl_has_bias_prop(node)) {
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int pull = sunxi_pctrl_parse_bias_prop(node);
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- if (pull < 0)
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+ if (pull < 0) {
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+ ret = pull;
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goto err_free;
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+ }
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pinconfig[idx++] = pinconf_to_config_packed(pull, 0);
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}
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@@ -294,7 +305,7 @@ static unsigned long *sunxi_pctrl_build_
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err_free:
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kfree(pinconfig);
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- return NULL;
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+ return ERR_PTR(ret);
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}
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static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
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@@ -328,7 +339,10 @@ static int sunxi_pctrl_dt_node_to_map(st
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/*
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* We have two maps for each pin: one for the function, one
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- * for the configuration (bias, strength, etc)
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+ * for the configuration (bias, strength, etc).
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+ *
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+ * We might be slightly overshooting, since we might not have
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+ * any configuration.
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*/
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nmaps = npins * 2;
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*map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
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@@ -336,8 +350,8 @@ static int sunxi_pctrl_dt_node_to_map(st
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return -ENOMEM;
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pinconfig = sunxi_pctrl_build_pin_config(node, &configlen);
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- if (!pinconfig) {
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- ret = -EINVAL;
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+ if (IS_ERR(pinconfig)) {
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+ ret = PTR_ERR(pinconfig);
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goto err_free_map;
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}
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@@ -364,15 +378,24 @@ static int sunxi_pctrl_dt_node_to_map(st
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i++;
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- (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
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- (*map)[i].data.configs.group_or_pin = group;
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- (*map)[i].data.configs.configs = pinconfig;
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- (*map)[i].data.configs.num_configs = configlen;
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-
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- i++;
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+ if (pinconfig) {
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+ (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
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+ (*map)[i].data.configs.group_or_pin = group;
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+ (*map)[i].data.configs.configs = pinconfig;
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+ (*map)[i].data.configs.num_configs = configlen;
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+ i++;
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+ }
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}
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- *num_maps = nmaps;
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+ *num_maps = i;
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+
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+ /*
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+ * We know have the number of maps we need, we can resize our
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+ * map array
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+ */
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+ *map = krealloc(*map, i * sizeof(struct pinctrl_map), GFP_KERNEL);
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+ if (!map)
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+ return -ENOMEM;
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return 0;
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