Rather than using the static timer irq definition, we should retrieve
timer irq from device tree for better.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

With old mxs clock support removed, the timer_clk argument of
mxs_timer_init is unused now, so remove it.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

When mxs_timer_init() does not have a timer_clk passed in, it should
try to request clock from clkdev system.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The patch converts mxs platform code to clk_prepare/clk_unprepare
by using helper functions clk_prepare_enable/clk_disable_unprepare.
Signed-off-by: NRichard Zhao <richard.zhao@linaro.org>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Convert the MXS timrotv2 32-bit down counting clocksource to the
generic clocksource infrastructure.

Cc: Sascha Hauer <kernel@pengutronix.de>
Acked-by: NShawn Guo <shawn.guo@freescale.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

There are 2 versions of the timrot on Freescale MXS-based SoCs.
The v1 on MX23 only gets 16 bits counter, while v2 on MX28
extends the counter to 32 bits.

The implementation uses two timers, one for clock_event and
another for clocksource. MX28 uses timrot 0 and 1, while MX23
uses 0 and 2.
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>