linux-kernel - Re: [PATCH 2/3] Input: spear-keyboard: Add clk

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Date:	Mon, 26 Nov 2012 08:56:09 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	spear-devel@...t.st.com,
	Vipul Kumar Samar <vipulkumar.samar@...com>
Subject: Re: [PATCH 2/3] Input: spear-keyboard: Add clk_{un}prepare() support

On Mon, Nov 26, 2012 at 09:57:45PM +0530, Viresh Kumar wrote:
> On 20 November 2012 14:17, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> > No, not really, it just does not work well with devm_* patches that got
> > applied: on removal you unprepare clock as the very first operation and
> > then devm_* does the rest which is wrong order.
> >
> > I am looking at adding dem_* for clocks.
> 
> I haven't seen your clock patch in your tree. I am asking because i want to
> push this patch :)

Yeah, I think I am not going to rush it and let it take its normal
course instead of short-cutting through my tree. I am going to apply the
patcch below in the meantime.

Thanks.

-- 
Dmitry


Input: spear-keyboard - Add clk_{un}prepare() support

From: Vipul Kumar Samar <vipulkumar.samar@...com>

clk_{un}prepare is mandatory for platforms using common clock framework.
Because for SPEAr we don't do anything in clk_{un}prepare() calls, just
call them once in probe/remove.

Signed-off-by: Vipul Kumar Samar <vipulkumar.samar@...com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/keyboard/spear-keyboard.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/input/keyboard/spear-keyboard.c b/drivers/input/keyboard/spear-keyboard.c
index d70093b..695d237 100644
--- a/drivers/input/keyboard/spear-keyboard.c
+++ b/drivers/input/keyboard/spear-keyboard.c
@@ -267,9 +267,14 @@ static int spear_kbd_probe(struct platform_device *pdev)
 		return error;
 	}
 
+	error = clk_prepare(kbd->clk);
+	if (error)
+		return error;
+
 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(&pdev->dev, "Unable to register keyboard device\n");
+		clk_unprepare(kbd->clk);
 		return error;
 	}
 
@@ -281,6 +286,11 @@ static int spear_kbd_probe(struct platform_device *pdev)
 
 static int spear_kbd_remove(struct platform_device *pdev)
 {
+	struct spear_kbd *kbd = platform_get_drvdata(pdev);
+
+	input_unregister_device(kbd->input);
+	clk_unprepare(kbd->clk);
+
 	device_init_wakeup(&pdev->dev, 0);
 	platform_set_drvdata(pdev, NULL);
 
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