linux-kernel - [PATCH v2] clocksource: owl: Improve owl_timer

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Message-Id: <20200219004810.411190-1-matheus@castello.eng.br>
Date:   Tue, 18 Feb 2020 21:48:10 -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 v2] clocksource: owl: Improve owl_timer_init fail messages

Check the return from clocksource_mmio_init, add messages in case of
an error and in case of not having a defined clock property.

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

Thanks Manivannan and Andreas for the review.
Tested on my Caninos Labrador s500 based board.

Changes since v1:
(suggested by maintainers)
- Maintains consistency output PTR_ERR(clk)
- Returning in case of error on clocksource_mmio_init
- Use parentheses between the error code
- Remove OF mention

 drivers/clocksource/timer-owl.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/timer-owl.c b/drivers/clocksource/timer-owl.c
index 900fe736145d..820fbcc05503 100644
--- a/drivers/clocksource/timer-owl.c
+++ b/drivers/clocksource/timer-owl.c
@@ -135,8 +135,11 @@ static int __init owl_timer_init(struct device_node *node)
 	}

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

 	rate = clk_get_rate(clk);

@@ -144,8 +147,12 @@ 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);
+		return ret;
+	}

 	owl_timer_reset(owl_clkevt_base);

--
2.25.0