linux-kernel - [PATCH 4.5 075/124] pinctrl: sh-pfc: only use dummy states for non-DT platforms

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Date:	Mon, 18 Apr 2016 11:29:07 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.5 075/124] pinctrl: sh-pfc: only use dummy states for non-DT platforms

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

commit 0129801be4b87226bf502f18f5a9eabd356d1058 upstream.

If pinctrl_provide_dummies() is used unconditionally, then the dummy
state will be used even on DT platforms when the "init" state was
intentionally left out. Instead of "default", the dummy "init" state
will then be used during probe. Thus, when probing an I2C controller on
cold boot, communication triggered by bus notifiers broke because the
pins were not initialized.

Do it like OMAP2: use the dummy state only for non-DT platforms.

Fixes: ef0eebc05130 ("drivers/pinctrl: Add the concept of an "init" state")
Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Acked-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/sh-pfc/core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -545,7 +545,9 @@ static int sh_pfc_probe(struct platform_
 			return ret;
 	}
 
-	pinctrl_provide_dummies();
+	/* Enable dummy states for those platforms without pinctrl support */
+	if (!of_have_populated_dt())
+		pinctrl_provide_dummies();
 
 	ret = sh_pfc_init_ranges(pfc);
 	if (ret < 0)