soc: qcom: add API for matching voltages across CPUs

Create an API to match voltages across asymmetric CPUs as
this can be useful in systems with a shared rail across CPUs.
The API takes in one input argument which is the frequency of
a big cluster CPU for which a voltage-equivalent little cluster
CPU frequency is desired. The return value is this little
cluster CPU frequency. All frequencies are in units of kHz.

Change-Id: I821819a0761566984dd7f92014599ff0fcb85e90
Signed-off-by: Amir Vajid <avajid@codeaurora.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/soc/qcom/msm_cpu_voltage.h b/include/soc/qcom/msm_cpu_voltage.h
new file mode 100644
index 000000000000..79ac8f61813c
--- /dev/null
+++ b/include/soc/qcom/msm_cpu_voltage.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+unsigned int msm_match_cpu_voltage_btol(unsigned int input_freq);