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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-12-04 16:33:53 +0100 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2015-12-11 10:11:40 +0100 |
commit | e1fef9e2ce4272b720ecb1ce696a72aaddbb7585 (patch) | |
tree | 7f0db2e1ff9ef4fac656f2fa0a89c3758cb4bb9e /drivers | |
parent | 8b092be9fd6a2cd84c437128e9b0d85e364efcfb (diff) | |
download | linux-e1fef9e2ce4272b720ecb1ce696a72aaddbb7585.tar.gz linux-e1fef9e2ce4272b720ecb1ce696a72aaddbb7585.tar.bz2 linux-e1fef9e2ce4272b720ecb1ce696a72aaddbb7585.zip |
gpio: rcar: Improve clock error handling and reporting
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 <magnus.damm@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/gpio/gpio-rcar.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index 1ed52fc026cb..624a435e6988 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; } |