linux-kernel - [PATCH] clocksource: owl: Improve owl_timer

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Message-Id: <20200214064923.190035-1-matheus@castello.eng.br>
Date:   Fri, 14 Feb 2020 03:49:23 -0300
From:   Matheus Castello <matheus@...tello.eng.br>
To:     afaerber@...e.de, manivannan.sadhasivam@...aro.org
Cc:     daniel.lezcano@...aro.org, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Matheus Castello <matheus@...tello.eng.br>
Subject: [PATCH] clocksource: owl: Improve owl_timer_init fail messages

Adding error messages, in case of not having a defined clock property
and in case of an error in clocksource_mmio_init, which may not be
fatal, so just adding a pr_err to notify that it failed.

Signed-off-by: Matheus Castello <matheus@...tello.eng.br>
---

Tested on my Caninos Labrador s500 based board. If the clock property is not
set this message would help debug:

...
[    0.000000] Failed to get OF clock for clocksource
[    0.000000] Failed to initialize '/soc/timer@...68000': -2
[    0.000000] timer_probe: no matching timers found
...

 drivers/clocksource/timer-owl.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/timer-owl.c b/drivers/clocksource/timer-owl.c
index 900fe736145d..f53596f9e86c 100644
--- a/drivers/clocksource/timer-owl.c
+++ b/drivers/clocksource/timer-owl.c
@@ -135,8 +135,10 @@ static int __init owl_timer_init(struct device_node *node)
 	}

 	clk = of_clk_get(node, 0);
-	if (IS_ERR(clk))
+	if (IS_ERR(clk)) {
+		pr_err("Failed to get OF clock for clocksource\n");
 		return PTR_ERR(clk);
+	}

 	rate = clk_get_rate(clk);

@@ -144,8 +146,11 @@ static int __init owl_timer_init(struct device_node *node)
 	owl_timer_set_enabled(owl_clksrc_base, true);

 	sched_clock_register(owl_timer_sched_read, 32, rate);
-	clocksource_mmio_init(owl_clksrc_base + OWL_Tx_VAL, node->name,
-			      rate, 200, 32, clocksource_mmio_readl_up);
+	ret = clocksource_mmio_init(owl_clksrc_base + OWL_Tx_VAL, node->name,
+				    rate, 200, 32, clocksource_mmio_readl_up);
+
+	if (ret)
+		pr_err("Failed to register clocksource %d\n", ret);

 	owl_timer_reset(owl_clkevt_base);

--
2.25.0