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of: remove internal arguments from of_property_for_each_u32()

Browse Source 
The of_property_for_each_u32() macro needs five parameters, two of which
are primarily meant as internal variables for the macro itself (in the
for() clause). Yet these two parameters are used by a few drivers, and this
can be considered misuse or at least bad practice.

Now that the kernel uses C11 to build, these two parameters can be avoided
by declaring them internally, thus changing this pattern:

  struct property *prop;
  const __be32 *p;
  u32 val;

  of_property_for_each_u32(np, "xyz", prop, p, val) { ... }

to this:

  u32 val;

  of_property_for_each_u32(np, "xyz", val) { ... }

However two variables cannot be declared in the for clause even with C11,
so declare one struct that contain the two variables we actually need. As
the variables inside this struct are not meant to be used by users of this
macro, give the struct instance the noticeable name "_it" so it is visible
during code reviews, helping to avoid new code to use it directly.

Most usages are trivially converted as they do not use those two
parameters, as expected. The non-trivial cases are:

 - drivers/clk/clk.c, of_clk_get_parent_name(): easily doable anyway
 - drivers/clk/clk-si5351.c, si5351_dt_parse(): this is more complex as the
   checks had to be replicated in a different way, making code more verbose
   and somewhat uglier, but I refrained from a full rework to keep as much
   of the original code untouched having no hardware to test my changes

All the changes have been build tested. The few for which I have the
hardware have been runtime-tested too.

Reviewed-by: Andre Przywara <andre.przywara@arm.com> # drivers/clk/sunxi/clk-simple-gates.c, drivers/clk/sunxi/clk-sun8i-bus-gates.c
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> # drivers/gpio/gpio-brcmstb.c
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> # drivers/irqchip/irq-atmel-aic-common.c
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # drivers/iio/adc/ti_am335x_adc.c
Acked-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> # drivers/pwm/pwm-samsung.c
Acked-by: Richard Leitner <richard.leitner@linux.dev> # drivers/usb/misc/usb251xb.c
Acked-by: Mark Brown <broonie@kernel.org> # sound/soc/codecs/arizona.c
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com> # sound/soc/codecs/arizona.c
Acked-by: Michael Ellerman <mpe@ellerman.id.au> # arch/powerpc/sysdev/xive/spapr.c
Acked-by: Stephen Boyd <sboyd@kernel.org> # clk
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Acked-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20240724-of_property_for_each_u32-v3-1-bea82ce429e2@bootlin.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Luca Ceresoli 2024-07-24 18:33:06 +02:00 committed by Rob Herring (Arm)
parent 7b52a9d9ee
commit 9722c3b66e
22 changed files with 61 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/sysdev/xive/native.c
View File

@ -559,9 +559,7 @@ bool __init xive_native_init(void)
struct device_node *np;
struct resource r;
void __iomem *tima;
struct property *prop;
u8 max_prio = 7;
const __be32 *p;
u32 val, cpu;
s64 rc;
@ -592,7 +590,7 @@ bool __init xive_native_init(void)
max_prio = val - 1;
/* Iterate the EQ sizes and pick one */
of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, p, val) {
of_property_for_each_u32(np, "ibm,xive-eq-sizes", val) {
xive_queue_shift = val;
if (val == PAGE_SHIFT)
break;

3
arch/powerpc/sysdev/xive/spapr.c
View File

@ -814,7 +814,6 @@ bool __init xive_spapr_init(void)
struct device_node *np;
struct resource r;
void __iomem *tima;
struct property *prop;
u8 max_prio;
u32 val;
u32 len;
@ -866,7 +865,7 @@ bool __init xive_spapr_init(void)
}
/* Iterate the EQ sizes and pick one */
of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, reg, val) {
of_property_for_each_u32(np, "ibm,xive-eq-sizes", val) {
xive_queue_shift = val;
if (val == PAGE_SHIFT)
break;

4
drivers/bus/ti-sysc.c
View File

@ -2291,11 +2291,9 @@ static int sysc_init_idlemode(struct sysc *ddata, u8 *idlemodes,
const char *name)
{
struct device_node *np = ddata->dev->of_node;
struct property *prop;
const __be32 *p;
u32 val;
of_property_for_each_u32(np, name, prop, p, val) {
of_property_for_each_u32(np, name, val) {
if (val >= SYSC_NR_IDLEMODES) {
dev_err(ddata->dev, "invalid idlemode: %i\n", val);
return -EINVAL;

4
drivers/clk/clk-conf.c
View File

@ -81,13 +81,11 @@ err:
static int __set_clk_rates(struct device_node *node, bool clk_supplier)
{
struct of_phandle_args clkspec;
struct property *prop;
const __be32 *cur;
int rc, index = 0;
struct clk *clk;
u32 rate;
of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) {
of_property_for_each_u32(node, "assigned-clock-rates", rate) {
if (rate) {
rc = of_parse_phandle_with_args(node, "assigned-clocks",
"#clock-cells", index, &clkspec);

43
drivers/clk/clk-si5351.c
View File

@ -1175,8 +1175,8 @@ static int si5351_dt_parse(struct i2c_client *client,
{
struct device_node *child, *np = client->dev.of_node;
struct si5351_platform_data *pdata;
struct property *prop;
const __be32 *p;
u32 array[4];
int sz, i;
int num = 0;
u32 val;
@ -1191,20 +1191,24 @@ static int si5351_dt_parse(struct i2c_client *client,
* property silabs,pll-source : <num src>, [<..>]
* allow to selectively set pll source
*/
of_property_for_each_u32(np, "silabs,pll-source", prop, p, num) {
sz = of_property_read_variable_u32_array(np, "silabs,pll-source", array, 2, 4);
sz = (sz == -EINVAL) ? 0 : sz; /* Missing property is OK */
if (sz < 0)
return dev_err_probe(&client->dev, sz, "invalid pll-source\n");
if (sz % 2)
return dev_err_probe(&client->dev, -EINVAL,
"missing pll-source for pll %d\n", array[sz - 1]);
for (i = 0; i < sz; i += 2) {
num = array[i];
val = array[i + 1];
if (num >= 2) {
dev_err(&client->dev,
"invalid pll %d on pll-source prop\n", num);
return -EINVAL;
}
p = of_prop_next_u32(prop, p, &val);
if (!p) {
dev_err(&client->dev,
"missing pll-source for pll %d\n", num);
return -EINVAL;
}
switch (val) {
case 0:
pdata->pll_src[num] = SI5351_PLL_SRC_XTAL;
@ -1232,19 +1236,24 @@ static int si5351_dt_parse(struct i2c_client *client,
pdata->pll_reset[0] = true;
pdata->pll_reset[1] = true;
of_property_for_each_u32(np, "silabs,pll-reset-mode", prop, p, num) {
sz = of_property_read_variable_u32_array(np, "silabs,pll-reset-mode", array, 2, 4);
sz = (sz == -EINVAL) ? 0 : sz; /* Missing property is OK */
if (sz < 0)
return dev_err_probe(&client->dev, sz, "invalid pll-reset-mode\n");
if (sz % 2)
return dev_err_probe(&client->dev, -EINVAL,
"missing pll-reset-mode for pll %d\n", array[sz - 1]);
for (i = 0; i < sz; i += 2) {
num = array[i];
val = array[i + 1];
if (num >= 2) {
dev_err(&client->dev,
"invalid pll %d on pll-reset-mode prop\n", num);
return -EINVAL;
}
p = of_prop_next_u32(prop, p, &val);
if (!p) {
dev_err(&client->dev,
"missing pll-reset-mode for pll %d\n", num);
return -EINVAL;
}
switch (val) {
case 0:

12
drivers/clk/clk.c
View File

@ -5364,9 +5364,8 @@ EXPORT_SYMBOL_GPL(of_clk_get_parent_count);
const char *of_clk_get_parent_name(const struct device_node *np, int index)
{
struct of_phandle_args clkspec;
struct property *prop;
const char *clk_name;
const __be32 *vp;
bool found = false;
u32 pv;
int rc;
int count;
@ -5383,15 +5382,16 @@ const char *of_clk_get_parent_name(const struct device_node *np, int index)
/* if there is an indices property, use it to transfer the index
* specified into an array offset for the clock-output-names property.
*/
of_property_for_each_u32(clkspec.np, "clock-indices", prop, vp, pv) {
of_property_for_each_u32(clkspec.np, "clock-indices", pv) {
if (index == pv) {
index = count;
found = true;
break;
}
count++;
}
/* We went off the end of 'clock-indices' without finding it */
if (prop && !vp)
if (of_property_present(clkspec.np, "clock-indices") && !found)
return NULL;
if (of_property_read_string_index(clkspec.np, "clock-output-names",
@ -5504,14 +5504,12 @@ static int parent_ready(struct device_node *np)
int of_clk_detect_critical(struct device_node *np, int index,
unsigned long *flags)
{
struct property *prop;
const __be32 *cur;
uint32_t idx;
if (!np || !flags)
return -EINVAL;
of_property_for_each_u32(np, "clock-critical", prop, cur, idx)
of_property_for_each_u32(np, "clock-critical", idx)
if (index == idx)
*flags |= CLK_IS_CRITICAL;

4
drivers/clk/qcom/common.c
View File

@ -227,11 +227,9 @@ EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc)
{
struct device_node *np = dev->of_node;
struct property *prop;
const __be32 *p;
u32 i;
of_property_for_each_u32(np, "protected-clocks", prop, p, i) {
of_property_for_each_u32(np, "protected-clocks", i) {
if (i >= cc->num_rclks)
continue;

4
drivers/clk/sunxi/clk-simple-gates.c
View File

@ -21,11 +21,9 @@ static void __init sunxi_simple_gates_setup(struct device_node *node,
{
struct clk_onecell_data *clk_data;
const char *clk_parent, *clk_name;
struct property *prop;
struct resource res;
void __iomem *clk_reg;
void __iomem *reg;
const __be32 *p;
int number, i = 0, j;
u8 clk_bit;
u32 index;
@ -47,7 +45,7 @@ static void __init sunxi_simple_gates_setup(struct device_node *node,
if (!clk_data->clks)
goto err_free_data;
of_property_for_each_u32(node, "clock-indices", prop, p, index) {
of_property_for_each_u32(node, "clock-indices", index) {
of_property_read_string_index(node, "clock-output-names",
i, &clk_name);

4
drivers/clk/sunxi/clk-sun8i-bus-gates.c
View File

@ -24,11 +24,9 @@ static void __init sun8i_h3_bus_gates_init(struct device_node *node)
const char *parents[PARENT_MAX];
struct clk_onecell_data *clk_data;
const char *clk_name;
struct property *prop;
struct resource res;
void __iomem *clk_reg;
void __iomem *reg;
const __be32 *p;
int number, i;
u8 clk_bit;
int index;
@ -58,7 +56,7 @@ static void __init sun8i_h3_bus_gates_init(struct device_node *node)
goto err_free_data;
i = 0;
of_property_for_each_u32(node, "clock-indices", prop, p, index) {
of_property_for_each_u32(node, "clock-indices", index) {
of_property_read_string_index(node, "clock-output-names",
i, &clk_name);

4
drivers/clocksource/samsung_pwm_timer.c
View File

@ -418,8 +418,6 @@ void __init samsung_pwm_clocksource_init(void __iomem *base,
static int __init samsung_pwm_alloc(struct device_node *np,
const struct samsung_pwm_variant *variant)
{
struct property *prop;
const __be32 *cur;
u32 val;
int i, ret;
@ -427,7 +425,7 @@ static int __init samsung_pwm_alloc(struct device_node *np,
for (i = 0; i < SAMSUNG_PWM_NUM; ++i)
pwm.irq[i] = irq_of_parse_and_map(np, i);
of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
of_property_for_each_u32(np, "samsung,pwm-outputs", val) {
if (val >= SAMSUNG_PWM_NUM) {
pr_warn("%s: invalid channel index in samsung,pwm-outputs property\n", __func__);
continue;

5
drivers/gpio/gpio-brcmstb.c
View File

@ -591,8 +591,6 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
void __iomem *reg_base;
struct brcmstb_gpio_priv *priv;
struct resource *res;
struct property *prop;
const __be32 *p;
u32 bank_width;
int num_banks = 0;
int num_gpios = 0;
@ -636,8 +634,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
#endif
of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
bank_width) {
of_property_for_each_u32(np, "brcm,gpio-bank-widths", bank_width) {
struct brcmstb_gpio_bank *bank;
struct gpio_chip *gc;

4
drivers/iio/adc/ti_am335x_adc.c
View File

@ -564,13 +564,11 @@ static int tiadc_parse_dt(struct platform_device *pdev,
struct tiadc_device *adc_dev)
{
struct device_node *node = pdev->dev.of_node;
struct property *prop;
const __be32 *cur;
int channels = 0;
u32 val;
int i;
of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
of_property_for_each_u32(node, "ti,adc-channels", val) {
adc_dev->channel_line[channels] = val;
/* Set Default values for optional DT parameters */

4
drivers/irqchip/irq-atmel-aic-common.c
View File

@ -111,8 +111,6 @@ static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
struct device_node *node = irq_domain_get_of_node(domain);
struct irq_chip_generic *gc;
struct aic_chip_data *aic;
struct property *prop;
const __be32 *p;
u32 hwirq;
gc = irq_get_domain_generic_chip(domain, 0);
@ -120,7 +118,7 @@ static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
aic = gc->private;
aic->ext_irqs |= 1;
of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
of_property_for_each_u32(node, "atmel,external-irqs", hwirq) {
gc = irq_get_domain_generic_chip(domain, hwirq);
if (!gc) {
pr_warn("AIC: external irq %d >= %d skip it\n",

4
drivers/irqchip/irq-pic32-evic.c
View File

@ -190,13 +190,11 @@ static void __init pic32_ext_irq_of_init(struct irq_domain *domain)
{
struct device_node *node = irq_domain_get_of_node(domain);
struct evic_chip_data *priv = domain->host_data;
struct property *prop;
const __le32 *p;
u32 hwirq;
int i = 0;
const char *pname = "microchip,external-irqs";
of_property_for_each_u32(node, pname, prop, p, hwirq) {
of_property_for_each_u32(node, pname, hwirq) {
if (i >= ARRAY_SIZE(priv->ext_irqs)) {
pr_warn("More than %d external irq, skip rest\n",
ARRAY_SIZE(priv->ext_irqs));

4
drivers/mfd/ti_am335x_tscadc.c
View File

@ -119,8 +119,6 @@ static int ti_tscadc_probe(struct platform_device *pdev)
struct clk *clk;
struct device_node *node;
struct mfd_cell *cell;
struct property *prop;
const __be32 *cur;
bool use_tsc = false, use_mag = false;
u32 val;
int err;
@ -167,7 +165,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
}
node = of_get_child_by_name(pdev->dev.of_node, "adc");
of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
of_property_for_each_u32(node, "ti,adc-channels", val) {
adc_channels++;
if (val > 7) {
dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",

4
drivers/pinctrl/nxp/pinctrl-s32cc.c
View File

@ -730,9 +730,7 @@ static int s32_pinctrl_parse_groups(struct device_node *np,
struct s32_pin_group *grp,
struct s32_pinctrl_soc_info *info)
{
const __be32 *p;
struct device *dev;
struct property *prop;
unsigned int *pins, *sss;
int i, npins;
u32 pinmux;
@ -763,7 +761,7 @@ static int s32_pinctrl_parse_groups(struct device_node *np,
return -ENOMEM;
i = 0;
of_property_for_each_u32(np, "pinmux", prop, p, pinmux) {
of_property_for_each_u32(np, "pinmux", pinmux) {
pins[i] = get_pin_no(pinmux);
sss[i] = get_pin_func(pinmux);

4
drivers/pinctrl/pinctrl-k210.c
View File

@ -763,8 +763,6 @@ static int k210_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
unsigned int *reserved_maps,
unsigned int *num_maps)
{
struct property *prop;
const __be32 *p;
int ret, pinmux_groups;
u32 pinmux_group;
unsigned long *configs = NULL;
@ -797,7 +795,7 @@ static int k210_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
if (ret < 0)
goto exit;
of_property_for_each_u32(np, "pinmux", prop, p, pinmux_group) {
of_property_for_each_u32(np, "pinmux", pinmux_group) {
const char *group_name, *func_name;
u32 pin = FIELD_GET(K210_PG_PIN, pinmux_group);
u32 func = FIELD_GET(K210_PG_FUNC, pinmux_group);

4
drivers/pwm/pwm-samsung.c
View File

@ -510,8 +510,6 @@ static int pwm_samsung_parse_dt(struct pwm_chip *chip)
struct samsung_pwm_chip *our_chip = to_samsung_pwm_chip(chip);
struct device_node *np = pwmchip_parent(chip)->of_node;
const struct of_device_id *match;
struct property *prop;
const __be32 *cur;
u32 val;
match = of_match_node(samsung_pwm_matches, np);
@ -520,7 +518,7 @@ static int pwm_samsung_parse_dt(struct pwm_chip *chip)
memcpy(&our_chip->variant, match->data, sizeof(our_chip->variant));
of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
of_property_for_each_u32(np, "samsung,pwm-outputs", val) {
if (val >= SAMSUNG_PWM_NUM) {
dev_err(pwmchip_parent(chip),
"%s: invalid channel index in samsung,pwm-outputs property\n",

4
drivers/tty/sysrq.c
View File

@ -770,8 +770,6 @@ static void sysrq_of_get_keyreset_config(void)
{
u32 key;
struct device_node *np;
struct property *prop;
const __be32 *p;
np = of_find_node_by_path("/chosen/linux,sysrq-reset-seq");
if (!np) {
@ -782,7 +780,7 @@ static void sysrq_of_get_keyreset_config(void)
/* Reset in case a __weak definition was present */
sysrq_reset_seq_len = 0;
of_property_for_each_u32(np, "keyset", prop, p, key) {
of_property_for_each_u32(np, "keyset", key) {
if (key == KEY_RESERVED || key > KEY_MAX ||
sysrq_reset_seq_len == SYSRQ_KEY_RESET_MAX)
break;

4
drivers/usb/misc/usb251xb.c
View File

@ -382,11 +382,9 @@ static void usb251xb_get_ports_field(struct usb251xb *hub,
bool ds_only, u8 *fld)
{
struct device *dev = hub->dev;
struct property *prop;
const __be32 *p;
u32 port;
of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
of_property_for_each_u32(dev->of_node, prop_name, port) {
if ((port >= ds_only ? 1 : 0) && (port <= port_cnt))
*fld |= BIT(port);
else

15
include/linux/of.h
View File

@ -430,11 +430,9 @@ extern int of_detach_node(struct device_node *);
#define of_match_ptr(_ptr) (_ptr)
/*
* struct property *prop;
* const __be32 *p;
* u32 u;
*
* of_property_for_each_u32(np, "propname", prop, p, u)
* of_property_for_each_u32(np, "propname", u)
* printk("U32 value: %x\n", u);
*/
const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
@ -1431,11 +1429,12 @@ static inline int of_property_read_s32(const struct device_node *np,
err == 0; \
err = of_phandle_iterator_next(it))
#define of_property_for_each_u32(np, propname, prop, p, u) \
for (prop = of_find_property(np, propname, NULL), \
p = of_prop_next_u32(prop, NULL, &u); \
p; \
p = of_prop_next_u32(prop, p, &u))
#define of_property_for_each_u32(np, propname, u) \
for (struct {struct property *prop; const __be32 *item; } _it = \
{of_find_property(np, propname, NULL), \
of_prop_next_u32(_it.prop, NULL, &u)}; \
_it.item; \
_it.item = of_prop_next_u32(_it.prop, _it.item, &u))
#define of_property_for_each_string(np, propname, prop, s) \
for (prop = of_find_property(np, propname, NULL), \

12
sound/soc/codecs/arizona.c
View File

@ -2786,15 +2786,13 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
{
struct arizona_pdata *pdata = &arizona->pdata;
struct device_node *np = arizona->dev->of_node;
struct property *prop;
const __be32 *cur;
u32 val;
u32 pdm_val[ARIZONA_MAX_PDM_SPK];
int ret;
int count = 0;
count = 0;
of_property_for_each_u32(np, "wlf,inmode", prop, cur, val) {
of_property_for_each_u32(np, "wlf,inmode", val) {
if (count == ARRAY_SIZE(pdata->inmode))
break;
@ -2803,7 +2801,7 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
}
count = 0;
of_property_for_each_u32(np, "wlf,dmic-ref", prop, cur, val) {
of_property_for_each_u32(np, "wlf,dmic-ref", val) {
if (count == ARRAY_SIZE(pdata->dmic_ref))
break;
@ -2812,7 +2810,7 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
}
count = 0;
of_property_for_each_u32(np, "wlf,out-mono", prop, cur, val) {
of_property_for_each_u32(np, "wlf,out-mono", val) {
if (count == ARRAY_SIZE(pdata->out_mono))
break;
@ -2821,7 +2819,7 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
}
count = 0;
of_property_for_each_u32(np, "wlf,max-channels-clocked", prop, cur, val) {
of_property_for_each_u32(np, "wlf,max-channels-clocked", val) {
if (count == ARRAY_SIZE(pdata->max_channels_clocked))
break;
@ -2830,7 +2828,7 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
}
count = 0;
of_property_for_each_u32(np, "wlf,out-volume-limit", prop, cur, val) {
of_property_for_each_u32(np, "wlf,out-volume-limit", val) {
if (count == ARRAY_SIZE(pdata->out_vol_limit))
break;