From 5165166e8a1551fb80afa5fdaad6f2ea34d92285 Mon Sep 17 00:00:00 2001
From: Ajit Pal Singh <ajitpal.singh@st.com>
Date: Mon, 14 Jul 2014 15:33:30 +0100
Subject: [PATCH] pwm: sti: Ensure same period values for all channels

ST PWM IP shares the same clock prescaler across all the PWM
channels. Hence configuration requests which change the period
will affect all the channels. Do not allow period changes which
will stomp period settings of the already configured channels.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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