[PATCH 1/3] pinctrl: uniphier: add check if pins are valid

[Dai Okamura]

The pinctrl datas of uniphier SoCs are the minimal subsets of kernel's one,
and some tables has no data to save the footprint size.
If the board dts tries to match a pin name on no pins defined SoC,
the footprint magic code causes "Synchronous Abort".

This checks if the 'pins' data is valid,
and if empty, avoids the abort with the warning as follows:

  WARNING at drivers/pinctrl/uniphier/pinctrl-uniphier-core.c:36/uniphier_pinctrl_get_pins_count()!
  pinctrl_select_state_full: pinctrl_config_one: err=-38

Signed-off-by: Dai Okamura <okamura.dai at socionext.com>
---
 drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
index 631bb1f963..bdca3f2f71 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -33,6 +33,9 @@ static int uniphier_pinctrl_get_pins_count(struct udevice *dev)
 	const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
 	int pins_count = priv->socdata->pins_count;
 
+	if (WARN_ON(!pins_count))
+		return 0; /* no table of pins */
+
 	/*
 	 * We do not list all pins in the pin table to save memory footprint.
 	 * Report the max pin number + 1 to fake the framework.
-- 
2.35.1