linux-kernel - [PATCH v2 2/4] can: hi311x: try to get crystal clock rate from property

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Message-Id: <20211206165542.69887-2-andriy.shevchenko@linux.intel.com>
Date:   Mon,  6 Dec 2021 18:55:40 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH v2 2/4] can: hi311x: try to get crystal clock rate from property

In some configurations, mainly ACPI-based, the clock frequency of the
device is supplied by very well established 'clock-frequency'
property. Hence, try to get it from the property at last if no other
providers are available.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: fixed rebase issue and hence no compilation error
 drivers/net/can/spi/hi311x.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index 13fb979645cf..c9efdd10d0f8 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -830,17 +830,26 @@ static int hi3110_can_probe(struct spi_device *spi)
 {
 	const struct of_device_id *of_id = of_match_device(hi3110_of_match,
 							   &spi->dev);
+	struct device *dev = &spi->dev;
 	struct net_device *net;
 	struct hi3110_priv *priv;
 	struct clk *clk;
-	int freq, ret;
+	u32 freq;
+	int ret;
 
 	clk = devm_clk_get_optional(&spi->dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(&spi->dev, "no CAN clock source defined\n");
 		return PTR_ERR(clk);
 	}
-	freq = clk_get_rate(clk);
+
+	if (clk) {
+		freq = clk_get_rate(clk);
+	} else {
+		ret = device_property_read_u32(dev, "clock-frequency", &freq);
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to get clock-frequency!\n");
+	}
 
 	/* Sanity check */
 	if (freq > 40000000)
-- 
2.33.0