linux-kernel - [PATCH 03/23] mfd/db8500-prcmu: initialize DB8500 PRCMU regs

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Message-ID: <1313137670-30683-1-git-send-email-linus.walleij@stericsson.com>
Date:	Fri, 12 Aug 2011 10:27:50 +0200
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Mattias Nilsson <mattias.i.nilsson@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 03/23] mfd/db8500-prcmu: initialize DB8500 PRCMU regs

From: Mattias Nilsson <mattias.i.nilsson@...ricsson.com>

Some clocks may be force enabled when we probe the
driver, but they need to be turned off by default so
we have a known state. We call this the register
initialization function if we need more stuff in
there in the future.

Signed-off-by: Mattias Nilsson <mattias.i.nilsson@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/mfd/db8500-prcmu.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index dcc690e..e2c4a26 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -1840,6 +1840,16 @@ void __init prcmu_early_init(void)
 	}
 }
 
+static void __init init_prcm_registers(void)
+{
+	u32 val;
+
+	val = readl(PRCM_A9PL_FORCE_CLKEN);
+	val &= ~(PRCM_A9PL_FORCE_CLKEN_PRCM_A9PL_FORCE_CLKEN |
+		PRCM_A9PL_FORCE_CLKEN_PRCM_A9AXI_FORCE_CLKEN);
+	writel(val, (PRCM_A9PL_FORCE_CLKEN));
+}
+
 /*
  * Power domain switches (ePODs) modeled as regulators for the DB8500 SoC
  */
@@ -2038,6 +2048,8 @@ static int __init db8500_prcmu_probe(struct platform_device *pdev)
 	if (ux500_is_svp())
 		return -ENODEV;
 
+	init_prcm_registers();
+
 	/* Clean up the mailbox interrupts after pre-kernel code. */
 	writel(ALL_MBOX_BITS, PRCM_ARM_IT1_CLR);
 
-- 
1.7.3.2

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