If the Renesas R-Car GPIO driver cannot find a functional clock, it
prints a warning, .e.g.
gpio_rcar ffc40000.gpio: unable to get clock
and continues, as the clock is optional, depending on the SoC type.
This warning may confuse users.
To fix this, add a flag to indicate that the clock is mandatory or
optional:
- If the clock is mandatory (on R-Car Gen2 and Gen3), a missing clock
is now treated as a fatal error,
- If the clock is optional (on R-Car Gen1), the warning is no longer
printed.
Suggested-by: Magnus Damm <[email protected]>
Signed-off-by: Geert Uytterhoeven <[email protected]>
---
v2:
- Use booleans instead of bitfields,
- Add reference to R-Car Gen3.
---
drivers/gpio/gpio-rcar.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 1ed52fc026cb4dd2..624a435e69889d7e 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -39,6 +39,7 @@ struct gpio_rcar_priv {
struct clk *clk;
unsigned int irq_parent;
bool has_both_edge_trigger;
+ bool needs_clk;
};
#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
@@ -317,14 +318,17 @@ static int gpio_rcar_direction_output(struct gpio_chip
*chip, unsigned offset,
struct gpio_rcar_info {
bool has_both_edge_trigger;
+ bool needs_clk;
};
static const struct gpio_rcar_info gpio_rcar_info_gen1 = {
.has_both_edge_trigger = false,
+ .needs_clk = false,
};
static const struct gpio_rcar_info gpio_rcar_info_gen2 = {
.has_both_edge_trigger = true,
+ .needs_clk = true,
};
static const struct of_device_id gpio_rcar_of_table[] = {
@@ -371,6 +375,7 @@ static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p,
unsigned int *npins)
ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
*npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
p->has_both_edge_trigger = info->has_both_edge_trigger;
+ p->needs_clk = info->needs_clk;
if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) {
dev_warn(&p->pdev->dev,
@@ -409,7 +414,11 @@ static int gpio_rcar_probe(struct platform_device *pdev)
p->clk = devm_clk_get(dev, NULL);
if (IS_ERR(p->clk)) {
- dev_warn(dev, "unable to get clock\n");
+ if (p->needs_clk) {
+ dev_err(dev, "unable to get clock\n");
+ ret = PTR_ERR(p->clk);
+ goto err0;
+ }
p->clk = NULL;
}
--
1.9.1
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