linux-kernel - [PATCH] regmap: regmap-irq: silently ignore unsupported type settings

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Message-ID: <20181227084443.GA23991@localhost.localdomain>
Date:   Thu, 27 Dec 2018 10:44:43 +0200
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     mazziesaccount@...il.com, matti.vaittinen@...rohmeurope.com
Cc:     broonie@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org,
        geert@...ux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH] regmap: regmap-irq: silently ignore unsupported type settings

Do not return error if irq-type setting is requested for
controlloer which does not support this. This is how
regmap-irq has previously handled the undupported type
settings and existing drivers seem to be upset if failure
is now reported.

Fixes: 1c2928e3e321 ("regmap: regmap-irq/gpio-max77620: add level-irq support")
Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---

Geert reported that 1c2928e3e321 breaks da9063-rtc on the Renesas
Koelsch board:

https://lore.kernel.org/lkml/20181227075648.GB2461@localhost.localdomain/T/#m194616cc88d7b4c2a78f7ce07907608fdb64a092

Geert, do you know if anyone vould to test this?

 drivers/base/regmap/regmap-irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 1bd1145ad8b5..d2d0014b0d23 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -258,7 +258,7 @@ static int regmap_irq_set_type(struct irq_data *data, unsigned int type)
 	const struct regmap_irq_type *t = &irq_data->type;
 
 	if ((t->types_supported & type) != type)
-		return -ENOTSUPP;
+		return 0;
 
 	reg = t->type_reg_offset / map->reg_stride;
 
-- 
2.14.3


-- 
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~