mfd: Initialize DB8500 PRCMU regs

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@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index dcc690efdc25..e2c4a26a9eb1 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);