Commit 5b4e8453 authored by Andrew Bresticker's avatar Andrew Bresticker Committed by Ralf Baechle

CLOCKSOURCE: mips-gic: Allow GIC clock to be specified in device-tree

As an alternative to the "clock-frequency" property, allow the GIC
timer operating clock to be specified in the device-tree instead.
This is useful on systems which use common clock or where the GIC
is not fixed to a particular frequency and is instead, for example,
derived from the CPU clock.
Signed-off-by: default avatarAndrew Bresticker <abrestic@chromium.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9309/
parent 615eb603
......@@ -27,8 +27,13 @@ Optional properties:
Required properties for timer sub-node:
- compatible : Should be "mti,gic-timer".
- interrupts : Interrupt for the GIC local timer.
Optional properties for timer sub-node:
- clocks : GIC timer operating clock.
- clock-frequency : Clock frequency at which the GIC timers operate.
Note that one of clocks or clock-frequency must be specified.
Example:
gic: interrupt-controller@1bdc0000 {
......
......@@ -5,6 +5,7 @@
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/cpu.h>
#include <linux/init.h>
......@@ -149,11 +150,18 @@ void __init gic_clocksource_init(unsigned int frequency)
static void __init gic_clocksource_of_init(struct device_node *node)
{
struct clk *clk;
if (WARN_ON(!gic_present || !node->parent ||
!of_device_is_compatible(node->parent, "mti,gic")))
return;
if (of_property_read_u32(node, "clock-frequency", &gic_frequency)) {
clk = of_clk_get(node, 0);
if (!IS_ERR(clk)) {
gic_frequency = clk_get_rate(clk);
clk_put(clk);
} else if (of_property_read_u32(node, "clock-frequency",
&gic_frequency)) {
pr_err("GIC frequency not specified.\n");
return;
}
......
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