linux-kernel - [PATCH v2 2/3] clocksource: update "fn" at CLOCKSOURCE_OF

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Date:   Sun, 23 Oct 2016 15:12:27 +0300
From:   Noam Camus <noamca@...lanox.com>
To:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <daniel.lezcano@...aro.org>
CC:     <tglx@...utronix.de>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Noam Camus <noamca@...lanox.com>
Subject: [PATCH v2 2/3] clocksource: update "fn" at CLOCKSOURCE_OF_DECLARE() of nps400 timer

From: Noam Camus <noamca@...lanox.com>

nps_setup_clocksource() should take node as only argument i.e.:
replace
int __init nps_setup_clocksource(struct device_node *node, struct clk *clk)
with
int __init nps_setup_clocksource(struct device_node *node)

This is also serve as preperation for next patch which adds support
for clockevents to nps400.
Specifically we add new function nps_get_timer_clk() to serve clocksource
and later clockevent registration.

Signed-off-by: Noam Camus <noamca@...lanox.com>
---
 drivers/clocksource/timer-nps.c |   49 ++++++++++++++++++++------------------
 1 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/drivers/clocksource/timer-nps.c b/drivers/clocksource/timer-nps.c
index 70c149a..6156e54 100644
--- a/drivers/clocksource/timer-nps.c
+++ b/drivers/clocksource/timer-nps.c
@@ -47,6 +47,28 @@
 static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly;
 
 static unsigned long nps_timer_rate;
+static int nps_get_timer_clk(struct device_node *node,
+			     unsigned long *timer_freq,
+			     struct clk *clk)
+{
+	int ret;
+
+	clk = of_clk_get(node, 0);
+	if (IS_ERR(clk)) {
+		pr_err("timer missing clk");
+		return PTR_ERR(clk);
+	}
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		pr_err("Couldn't enable parent clk\n");
+		return ret;
+	}
+
+	*timer_freq = clk_get_rate(clk);
+
+	return 0;
+}
 
 static cycle_t nps_clksrc_read(struct clocksource *clksrc)
 {
@@ -55,23 +77,17 @@ static cycle_t nps_clksrc_read(struct clocksource *clksrc)
 	return (cycle_t)ioread32be(nps_msu_reg_low_addr[cluster]);
 }
 
-static int __init nps_setup_clocksource(struct device_node *node,
-					struct clk *clk)
+static int __init nps_setup_clocksource(struct device_node *node)
 {
 	int ret, cluster;
+	struct clk *clk;
 
 	for (cluster = 0; cluster < NPS_CLUSTER_NUM; cluster++)
 		nps_msu_reg_low_addr[cluster] =
 			nps_host_reg((cluster << NPS_CLUSTER_OFFSET),
 				 NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
 
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		pr_err("Couldn't enable parent clock\n");
-		return ret;
-	}
-
-	nps_timer_rate = clk_get_rate(clk);
+	nps_get_timer_clk(node, &nps_timer_rate, clk);
 
 	ret = clocksource_mmio_init(nps_msu_reg_low_addr, "EZnps-tick",
 				    nps_timer_rate, 301, 32, nps_clksrc_read);
@@ -83,18 +99,5 @@ static int __init nps_setup_clocksource(struct device_node *node,
 	return ret;
 }
 
-static int __init nps_timer_init(struct device_node *node)
-{
-	struct clk *clk;
-
-	clk = of_clk_get(node, 0);
-	if (IS_ERR(clk)) {
-		pr_err("Can't get timer clock.\n");
-		return PTR_ERR(clk);
-	}
-
-	return nps_setup_clocksource(node, clk);
-}
-
 CLOCKSOURCE_OF_DECLARE(ezchip_nps400_clksrc, "ezchip,nps400-timer",
-		       nps_timer_init);
+		       nps_setup_clocksource);
-- 
1.7.1