linux-kernel - [PATCH 19/26] x86 STA2X11 platform: create sta2x11-clock-regs device

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Date:	Wed, 7 Aug 2013 12:20:48 +0200
From:	Davide Ciminaghi <ciminaghi@...dd.com>
To:	linux-kernel@...r.kernel.org
Cc:	rubini@...dd.com, Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	devicetree@...r.kernel.org
Subject: [PATCH 19/26] x86 STA2X11 platform: create sta2x11-clock-regs
 device

This patch creates a virtual platform device each time the apb-soc-regs
and sctl devices have been probed for a given sta2x11 instance.
This will trigger clock registration for such instance.

Signed-off-by: Davide Ciminaghi <ciminaghi@...dd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
---
 arch/x86/include/asm/sta2x11.h      |    1 +
 arch/x86/platform/sta2x11/sta2x11.c |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/sta2x11.h b/arch/x86/include/asm/sta2x11.h
index 31fc648..3c5dee4 100644
--- a/arch/x86/include/asm/sta2x11.h
+++ b/arch/x86/include/asm/sta2x11.h
@@ -78,6 +78,7 @@ struct sta2x11_instance_data *sta2x11_dev_to_instance(struct device *dev)
 #define STA2X11_APBREG_NAME		"sta2x11-apbreg"
 #define STA2X11_APB_SOC_REGS_NAME	"sta2x11-apb-soc-regs"
 #define STA2X11_VIC_NAME		"sta2x11-vic"
+#define STA2X11_CLOCK_REGS_NAME		"sta2x11-clock-regs"
 
 /* CAN and MLB */
 #define APBREG_BSR	0x00	/* Bridge Status Reg */
diff --git a/arch/x86/platform/sta2x11/sta2x11.c b/arch/x86/platform/sta2x11/sta2x11.c
index 1f1d1af..57ed10d 100644
--- a/arch/x86/platform/sta2x11/sta2x11.c
+++ b/arch/x86/platform/sta2x11/sta2x11.c
@@ -243,6 +243,20 @@ struct sta2x11_instance_data *sta2x11_node_to_instance(struct device_node *n)
 }
 EXPORT_SYMBOL(sta2x11_node_to_instance);
 
+static int create_clk_dev(struct sta2x11_instance_data *instance)
+{
+	int stat;
+	struct platform_device *cpd =
+		platform_device_alloc(STA2X11_CLOCK_REGS_NAME, instance->id);
+	if (!cpd)
+		return -ENOMEM;
+
+	cpd->dev.platform_data = instance;
+	stat = platform_device_add(cpd);
+	if (stat < 0)
+		platform_device_put(cpd);
+	return stat;
+}
 
 /* Common probe for the four platform devices */
 static int sta2x11_platform_probe(struct platform_device *dev,
@@ -312,6 +326,13 @@ static int sta2x11_platform_probe(struct platform_device *dev,
 	}
 	*dst = platform_drv_data;
 
+	/*
+	 * When both sctl and apb_soc_regs have been probed, we're ready for
+	 * creating the "sta2x11-clock-regs" platform device
+	 */
+	if (instance->sctl && instance->apb_soc_regs)
+		create_clk_dev(instance);
+
 	platform_set_drvdata(dev, platform_drv_data);
 	return 0;
 }
-- 
1.7.7.2
--
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