clocksource/drivers/dw_apb: Add reset control
Add code to retrieve the reset property from the dw-apb timers and if the property is available, the safe operation is to assert the timer into reset, and followed by a deassert of the timer reset (brings the timer out of reset). This patch is needed for systems where the bootloader has left the timer not used in reset. - Trivial conflict with commit a74bd1ad7a: "Convert to using %pOFn instead of device_node.name" Reported-by: Marek Vasut <marex@denx.de> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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@ -22,6 +22,7 @@
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/clk.h>
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#include <linux/reset.h>
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#include <linux/sched_clock.h>
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static void __init timer_get_base_and_rate(struct device_node *np,
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@ -29,12 +30,23 @@ static void __init timer_get_base_and_rate(struct device_node *np,
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{
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struct clk *timer_clk;
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struct clk *pclk;
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struct reset_control *rstc;
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*base = of_iomap(np, 0);
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if (!*base)
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panic("Unable to map regs for %pOFn", np);
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/*
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* Reset the timer if the reset control is available, wiping
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* out the state the firmware may have left it
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*/
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rstc = of_reset_control_get(np, NULL);
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if (!IS_ERR(rstc)) {
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reset_control_assert(rstc);
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reset_control_deassert(rstc);
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}
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/*
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* Not all implementations use a periphal clock, so don't panic
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* if it's not present
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