linux-kernel - [PATCH 10/11] PINCTRL: lantiq: fix pin availability check

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Message-Id: <1359720305-31933-10-git-send-email-blogic@openwrt.org>
Date:	Fri,  1 Feb 2013 13:05:04 +0100
From:	John Crispin <blogic@...nwrt.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org, John Crispin <blogic@...nwrt.org>,
	Thomas Langer <thomas.langer@...tiq.com>
Subject: [PATCH 10/11] PINCTRL: lantiq: fix pin availability check

The clock needs to be activated for the check to work. In order to be compatible
with future silicon make sure that at least 1 pin is available before probing
the pad controller.

Signed-off-by: Thomas Langer <thomas.langer@...tiq.com>
Signed-off-by: John Crispin <blogic@...nwrt.org>
---
 drivers/pinctrl/pinctrl-falcon.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-falcon.c b/drivers/pinctrl/pinctrl-falcon.c
index 4a0d54a..de9d1db 100644
--- a/drivers/pinctrl/pinctrl-falcon.c
+++ b/drivers/pinctrl/pinctrl-falcon.c
@@ -455,12 +455,17 @@ static int pinctrl_falcon_probe(struct platform_device *pdev)
 				*bank);
 			return -ENOMEM;
 		}
+		clk_activate(falcon_info.clk[*bank]);
 		avail = pad_r32(falcon_info.membase[*bank],
 					LTQ_PADC_AVAIL);
 		pins = fls(avail);
-		lantiq_load_pin_desc(&falcon_pads[pad_count], *bank, pins);
-		pad_count += pins;
-		clk_enable(falcon_info.clk[*bank]);
+		if (pins) {
+			lantiq_load_pin_desc(&falcon_pads[pad_count],
+								*bank, pins);
+			pad_count += pins;
+		} else {
+			clk_deactivate(falcon_info.clk[*bank]);
+		}
 		dev_dbg(&pdev->dev, "found %s with %d pads\n",
 				res.name, pins);
 	}
-- 
1.7.10.4

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