[PATCH v2 2/4] pinctrl: s32: refine error/return/config checks and simplify driver codes

From: Chester Lin
Date: Mon Mar 20 2023 - 12:46:03 EST

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Improve error/return code handlings and config checks in order to have
better reliability and simplify driver codes such as removing/changing
improper macros, blanks, print formats and helper calls.

Signed-off-by: Chester Lin <clin@xxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
Changes in v2:
- Enhance sizeof() arguments.
- Fix blanks and remove unnecessary parentheses.
- Move s32g_pinctrl_probe() changes to the patch [1/4].

drivers/pinctrl/nxp/pinctrl-s32cc.c | 141 +++++++++++++++-------------
drivers/pinctrl/nxp/pinctrl-s32g2.c | 4 +-
2 files changed, 76 insertions(+), 69 deletions(-)

diff --git a/drivers/pinctrl/nxp/pinctrl-s32cc.c b/drivers/pinctrl/nxp/pinctrl-s32cc.c
index e1da332433a3..f698e1a240ef 100644
--- a/drivers/pinctrl/nxp/pinctrl-s32cc.c
+++ b/drivers/pinctrl/nxp/pinctrl-s32cc.c
@@ -28,7 +28,8 @@
#include "../pinctrl-utils.h"
#include "pinctrl-s32.h"

-#define S32_PIN_ID_MASK GENMASK(31, 4)
+#define S32_PIN_ID_SHIFT 4
+#define S32_PIN_ID_MASK GENMASK(31, S32_PIN_ID_SHIFT)

#define S32_MSCR_SSS_MASK GENMASK(2, 0)
#define S32_MSCR_PUS BIT(12)
@@ -46,7 +47,7 @@ static struct regmap_config s32_regmap_config = {

static u32 get_pin_no(u32 pinmux)
{
- return (pinmux & S32_PIN_ID_MASK) >> __ffs(S32_PIN_ID_MASK);
+ return (pinmux & S32_PIN_ID_MASK) >> S32_PIN_ID_SHIFT;
}

static u32 get_pin_func(u32 pinmux)
@@ -108,7 +109,7 @@ s32_get_region(struct pinctrl_dev *pctldev, unsigned int pin)
unsigned int mem_regions = ipctl->info->mem_regions;
unsigned int i;

- for (i = 0; i < mem_regions; ++i) {
+ for (i = 0; i < mem_regions; i++) {
pin_range = ipctl->regions[i].pin_range;
if (pin >= pin_range->start && pin <= pin_range->end)
return &ipctl->regions[i];
@@ -224,8 +225,7 @@ static int s32_dt_group_node_to_map(struct pinctrl_dev *pctldev,

n_pins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32));
if (n_pins < 0) {
- dev_warn(dev, "Unable to find 'pinmux' property in node %s.\n",
- np->name);
+ dev_warn(dev, "Can't find 'pinmux' property in node %pOFn\n", np);
} else if (!n_pins) {
return -EINVAL;
}
@@ -317,20 +317,25 @@ static int s32_pmx_set(struct pinctrl_dev *pctldev, unsigned int selector,
info->functions[selector].name, grp->name);

/* Check beforehand so we don't have a partial config. */
- for (i = 0; i < grp->npins; ++i) {
+ for (i = 0; i < grp->npins; i++) {
if (s32_check_pin(pctldev, grp->pin_ids[i]) != 0) {
- dev_err(info->dev, "invalid pin: %d in group: %d\n",
+ dev_err(info->dev, "invalid pin: %u in group: %u\n",
grp->pin_ids[i], group);
return -EINVAL;
}
}

- for (i = 0, ret = 0; i < grp->npins && !ret; ++i) {
+ for (i = 0, ret = 0; i < grp->npins && !ret; i++) {
ret = s32_regmap_update(pctldev, grp->pin_ids[i],
S32_MSCR_SSS_MASK, grp->pin_sss[i]);
+ if (ret) {
+ dev_err(info->dev, "Failed to set pin %u\n",
+ grp->pin_ids[i]);
+ return ret;
+ }
}

- return ret;
+ return 0;
}

static int s32_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
@@ -375,8 +380,8 @@ static int s32_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
int ret;

ret = s32_regmap_read(pctldev, offset, &config);
- if (ret != 0)
- return -EINVAL;
+ if (ret)
+ return ret;

/* Save current configuration */
gpio_pin = kmalloc(sizeof(*gpio_pin), GFP_KERNEL);
@@ -387,7 +392,7 @@ static int s32_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
gpio_pin->config = config;

spin_lock_irqsave(&ipctl->gpio_configs_lock, flags);
- list_add(&(gpio_pin->list), &(ipctl->gpio_configs));
+ list_add(&gpio_pin->list, &ipctl->gpio_configs);
spin_unlock_irqrestore(&ipctl->gpio_configs_lock, flags);

/* GPIO pin means SSS = 0 */
@@ -401,23 +406,20 @@ static void s32_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
unsigned int offset)
{
struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
- struct list_head *pos, *tmp;
- struct gpio_pin_config *gpio_pin;
+ struct gpio_pin_config *gpio_pin, *tmp;
unsigned long flags;
int ret;

spin_lock_irqsave(&ipctl->gpio_configs_lock, flags);

- list_for_each_safe(pos, tmp, &ipctl->gpio_configs) {
- gpio_pin = list_entry(pos, struct gpio_pin_config, list);
-
+ list_for_each_entry_safe(gpio_pin, tmp, &ipctl->gpio_configs, list) {
if (gpio_pin->pin_id == offset) {
ret = s32_regmap_write(pctldev, gpio_pin->pin_id,
gpio_pin->config);
if (ret != 0)
goto unlock;

- list_del(pos);
+ list_del(&gpio_pin->list);
kfree(gpio_pin);
break;
}
@@ -461,7 +463,8 @@ static const int support_slew[] = {208, -1, -1, -1, 166, 150, 133, 83};

static int s32_get_slew_regval(int arg)
{
- int i;
+ unsigned int i;
+
/* Translate a real slew rate (MHz) to a register value */
for (i = 0; i < ARRAY_SIZE(support_slew); i++) {
if (arg == support_slew[i])
@@ -542,10 +545,11 @@ static int s32_pinconf_mscr_update(struct pinctrl_dev *pctldev,
unsigned int config = 0, mask = 0;
int i, ret;

- if (s32_check_pin(pctldev, pin_id) != 0)
- return -EINVAL;
+ ret = s32_check_pin(pctldev, pin_id);
+ if (ret)
+ return ret;

- dev_dbg(ipctl->dev, "pinconf set pin %s with %d configs\n",
+ dev_dbg(ipctl->dev, "pinconf set pin %s with %u configs\n",
pin_get_name(pctldev, pin_id), num_configs);

for (i = 0; i < num_configs; i++) {
@@ -559,11 +563,9 @@ static int s32_pinconf_mscr_update(struct pinctrl_dev *pctldev,
if (!config && !mask)
return 0;

- ret = s32_regmap_update(pctldev, pin_id, mask, config);
+ dev_dbg(ipctl->dev, "update: pin %u cfg 0x%x\n", pin_id, config);

- dev_dbg(ipctl->dev, "update: pin %d cfg 0x%x\n", pin_id, config);
-
- return ret;
+ return s32_regmap_update(pctldev, pin_id, mask, config);
}

static int s32_pinconf_get(struct pinctrl_dev *pctldev,
@@ -604,10 +606,13 @@ static void s32_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned int pin_id)
{
unsigned int config;
- int ret = s32_regmap_read(pctldev, pin_id, &config);
+ int ret;

- if (!ret)
- seq_printf(s, "0x%x", config);
+ ret = s32_regmap_read(pctldev, pin_id, &config);
+ if (ret)
+ return;
+
+ seq_printf(s, "0x%x", config);
}

static void s32_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
@@ -710,7 +715,7 @@ int s32_pinctrl_resume(struct device *dev)
}
#endif

-static void s32_pinctrl_parse_groups(struct device_node *np,
+static int s32_pinctrl_parse_groups(struct device_node *np,
struct s32_pin_group *grp,
struct s32_pinctrl_soc_info *info)
{
@@ -722,21 +727,20 @@ static void s32_pinctrl_parse_groups(struct device_node *np,

dev = info->dev;

- dev_dbg(dev, "group: %s\n", np->name);
+ dev_dbg(dev, "group: %pOFn\n", np);

/* Initialise group */
grp->name = np->name;

npins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32));
-
if (npins < 0) {
dev_err(dev, "Failed to read 'pinmux' property in node %s.\n",
- np->name);
- return;
+ grp->name);
+ return -EINVAL;
}
if (!npins) {
- dev_err(dev, "The group %s has no pins.\n", np->name);
- return;
+ dev_err(dev, "The group %s has no pins.\n", grp->name);
+ return -EINVAL;
}

grp->npins = npins;
@@ -745,12 +749,8 @@ static void s32_pinctrl_parse_groups(struct device_node *np,
sizeof(unsigned int), GFP_KERNEL);
grp->pin_sss = devm_kcalloc(info->dev, grp->npins,
sizeof(unsigned int), GFP_KERNEL);
-
- if (!grp->pin_ids || !grp->pin_sss) {
- dev_err(dev, "Failed to allocate memory for the group %s.\n",
- np->name);
- return;
- }
+ if (!grp->pin_ids || !grp->pin_sss)
+ return -ENOMEM;

i = 0;
of_property_for_each_u32(np, "pinmux", prop, p, pinmux) {
@@ -761,9 +761,11 @@ static void s32_pinctrl_parse_groups(struct device_node *np,
grp->pin_ids[i], grp->pin_sss[i]);
i++;
}
+
+ return 0;
}

-static void s32_pinctrl_parse_functions(struct device_node *np,
+static int s32_pinctrl_parse_functions(struct device_node *np,
struct s32_pinctrl_soc_info *info,
u32 index)
{
@@ -771,8 +773,9 @@ static void s32_pinctrl_parse_functions(struct device_node *np,
struct s32_pmx_func *func;
struct s32_pin_group *grp;
u32 i = 0;
+ int ret = 0;

- dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
+ dev_dbg(info->dev, "parse function(%u): %pOFn\n", index, np);

func = &info->functions[index];

@@ -780,18 +783,24 @@ static void s32_pinctrl_parse_functions(struct device_node *np,
func->name = np->name;
func->num_groups = of_get_child_count(np);
if (func->num_groups == 0) {
- dev_err(info->dev, "no groups defined in %s\n", np->full_name);
- return;
+ dev_err(info->dev, "no groups defined in %pOF\n", np);
+ return -EINVAL;
}
- func->groups = devm_kzalloc(info->dev,
- func->num_groups * sizeof(char *), GFP_KERNEL);
+ func->groups = devm_kcalloc(info->dev, func->num_groups,
+ sizeof(*func->groups), GFP_KERNEL);
+ if (!func->groups)
+ return -ENOMEM;

for_each_child_of_node(np, child) {
func->groups[i] = child->name;
grp = &info->groups[info->grp_index++];
- s32_pinctrl_parse_groups(child, grp, info);
+ ret = s32_pinctrl_parse_groups(child, grp, info);
+ if (ret)
+ return ret;
i++;
}
+
+ return 0;
}

static int s32_pinctrl_probe_dt(struct platform_device *pdev,
@@ -804,6 +813,7 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
struct regmap *map;
void __iomem *base;
int mem_regions = info->mem_regions;
+ int ret;
u32 nfuncs = 0;
u32 i = 0;

@@ -815,13 +825,12 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
return -EINVAL;
}

- ipctl->regions = devm_kzalloc(&pdev->dev,
- mem_regions * sizeof(*(ipctl->regions)),
- GFP_KERNEL);
+ ipctl->regions = devm_kcalloc(&pdev->dev, mem_regions,
+ sizeof(*ipctl->regions), GFP_KERNEL);
if (!ipctl->regions)
return -ENOMEM;

- for (i = 0; i < mem_regions; ++i) {
+ for (i = 0; i < mem_regions; i++) {
base = devm_platform_get_and_ioremap_resource(pdev, i, &res);
if (IS_ERR(base))
return PTR_ERR(base);
@@ -851,24 +860,26 @@ static int s32_pinctrl_probe_dt(struct platform_device *pdev,
}

info->nfunctions = nfuncs;
- info->functions = devm_kzalloc(&pdev->dev,
- nfuncs * sizeof(struct s32_pmx_func),
- GFP_KERNEL);
+ info->functions = devm_kcalloc(&pdev->dev, nfuncs,
+ sizeof(*info->functions), GFP_KERNEL);
if (!info->functions)
return -ENOMEM;

info->ngroups = 0;
for_each_child_of_node(np, child)
info->ngroups += of_get_child_count(child);
- info->groups = devm_kzalloc(&pdev->dev,
- info->ngroups * sizeof(struct s32_pin_group),
- GFP_KERNEL);
+
+ info->groups = devm_kcalloc(&pdev->dev, info->ngroups,
+ sizeof(*info->groups), GFP_KERNEL);
if (!info->groups)
return -ENOMEM;

i = 0;
- for_each_child_of_node(np, child)
- s32_pinctrl_parse_functions(child, info, i++);
+ for_each_child_of_node(np, child) {
+ ret = s32_pinctrl_parse_functions(child, info, i++);
+ if (ret)
+ return ret;
+ }

return 0;
}
@@ -923,11 +934,9 @@ int s32_pinctrl_probe(struct platform_device *pdev,

ipctl->pctl = devm_pinctrl_register(&pdev->dev, s32_pinctrl_desc,
ipctl);
-
- if (IS_ERR(ipctl->pctl)) {
- dev_err(&pdev->dev, "could not register s32 pinctrl driver\n");
- return PTR_ERR(ipctl->pctl);
- }
+ if (IS_ERR(ipctl->pctl))
+ return dev_err_probe(&pdev->dev, PTR_ERR(ipctl->pctl),
+ "could not register s32 pinctrl driver\n");

#ifdef CONFIG_PM_SLEEP
saved_context = &ipctl->saved_context;
diff --git a/drivers/pinctrl/nxp/pinctrl-s32g2.c b/drivers/pinctrl/nxp/pinctrl-s32g2.c
index f99f88615ef6..9f521312f768 100644
--- a/drivers/pinctrl/nxp/pinctrl-s32g2.c
+++ b/drivers/pinctrl/nxp/pinctrl-s32g2.c
@@ -755,14 +755,12 @@ static const struct dev_pm_ops s32g_pinctrl_pm_ops = {
static struct platform_driver s32g_pinctrl_driver = {
.driver = {
.name = "s32g-siul2-pinctrl",
- .owner = THIS_MODULE,
.of_match_table = s32_pinctrl_of_match,
- .pm = &s32g_pinctrl_pm_ops,
+ .pm = pm_sleep_ptr(&s32g_pinctrl_pm_ops),
.suppress_bind_attrs = true,
},
.probe = s32g_pinctrl_probe,
};
-
builtin_platform_driver(s32g_pinctrl_driver);

MODULE_AUTHOR("Matthew Nunez <matthew.nunez@xxxxxxx>");
--
2.37.3

Next message: Chester Lin: "[PATCH v2 0/4] pinctrl: s32: driver improvements and generic struct use"
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In reply to: Chester Lin: "[PATCH v2 0/4] pinctrl: s32: driver improvements and generic struct use"
Next in thread: Chester Lin: "[PATCH v2 1/4] pinctrl: s32: use of_device_get_match_data() to get device data"
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