linux-kernel - Re: [PATCH 3/3] ARM: OMAP: omap_device: expose hwmod assert/deassert to omap devices

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Date:	Thu, 2 Aug 2012 01:43:45 -0600 (MDT)
From:	Paul Walmsley <paul@...an.com>
To:	Omar Ramirez Luna <omar.luna@...aro.org>
cc:	Benoit Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: OMAP: omap_device: expose hwmod assert/deassert
 to omap devices

Hi Omar

On Mon, 16 Jul 2012, Omar Ramirez Luna wrote:

> This APIs are meant to be an interface to hwmod assert/deassert
> function, omap devices can call them through their platform data
> to control their reset lines, they are expected to know the name
> of the reset line they are trying to control.
> 
> Signed-off-by: Omar Ramirez Luna <omar.luna@...aro.org>

This one has been queued for 3.7 with a few changes. Some more detail was 
added to the function documentationrovement.  Also the multiple 
assignments were removed per Documentation/CodingStyle chapter 1:

"Don't put multiple assignments on a single line either."

Please let me know if you have any comments.


- Paul

From: Omar Ramirez Luna <omar.luna@...aro.org>
Date: Mon, 16 Jul 2012 14:21:25 -0500
Subject: [PATCH] ARM: OMAP2+: omap_device: expose hwmod assert/deassert to
 omap devices

This API is meant to be an interface to hwmod assert/deassert
function, omap devices can call them through their platform data to
control their reset lines, they are expected to know the name of the
reset line they are trying to control.

Signed-off-by: Omar Ramirez Luna <omar.luna@...aro.org>
[paul@...an.com: tweaked some documentation; fixed CodingStyle issue]
Signed-off-by: Paul Walmsley <paul@...an.com>
---
 arch/arm/plat-omap/include/plat/omap_device.h |    4 ++
 arch/arm/plat-omap/omap_device.c              |   55 +++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 4327b2c..27bcc24 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/arch/arm/plat-omap/include/plat/omap_device.h
@@ -118,6 +118,10 @@ int omap_device_get_context_loss_count(struct platform_device *pdev);
 
 /* Other */
 
+int omap_device_assert_hardreset(struct platform_device *pdev,
+				 const char *name);
+int omap_device_deassert_hardreset(struct platform_device *pdev,
+				 const char *name);
 int omap_device_idle_hwmods(struct omap_device *od);
 int omap_device_enable_hwmods(struct omap_device *od);
 
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index c490240..3b02312 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -925,6 +925,61 @@ int omap_device_shutdown(struct platform_device *pdev)
 }
 
 /**
+ * omap_device_assert_hardreset - set a device's hardreset line
+ * @pdev: struct platform_device * to reset
+ * @name: const char * name of the reset line
+ *
+ * Set the hardreset line identified by @name on the IP blocks
+ * associated with the hwmods backing the platform_device @pdev.  All
+ * of the hwmods associated with @pdev must have the same hardreset
+ * line linked to them for this to work.  Passes along the return value
+ * of omap_hwmod_assert_hardreset() in the event of any failure, or
+ * returns 0 upon success.
+ */
+int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
+{
+	struct omap_device *od = to_omap_device(pdev);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/**
+ * omap_device_deassert_hardreset - release a device's hardreset line
+ * @pdev: struct platform_device * to reset
+ * @name: const char * name of the reset line
+ *
+ * Release the hardreset line identified by @name on the IP blocks
+ * associated with the hwmods backing the platform_device @pdev.  All
+ * of the hwmods associated with @pdev must have the same hardreset
+ * line linked to them for this to work.  Passes along the return
+ * value of omap_hwmod_deassert_hardreset() in the event of any
+ * failure, or returns 0 upon success.
+ */
+int omap_device_deassert_hardreset(struct platform_device *pdev,
+				   const char *name)
+{
+	struct omap_device *od = to_omap_device(pdev);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/**
  * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
  * @od: struct omap_device *
  *
-- 
1.7.10.4

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