linux-kernel - [PATCH v1 3/3] iio: imu: adis16480: Fix getting the optional clocks

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Date:   Wed, 13 Apr 2022 17:41:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Nuno Sá <nuno.sa@...log.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH v1 3/3] iio: imu: adis16480: Fix getting the optional clocks

The extended clocks are optional and may not be present for some SoCs
supported by this driver. Nevertheless, in case the clock is provided
but some error happens during its getting, that error should be handled
properly. Use devm_clk_get_optional() API for that. Also report possible
errors using dev_err_probe() to handle properly -EPROBE_DEFER error.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/iio/imu/adis16480.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index 287914016f28..fe520194a837 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -1362,31 +1362,25 @@ static int adis16480_get_ext_clocks(struct adis16480 *st)
 {
 	struct device *dev = &st->adis.spi->dev;
 
-	st->clk_mode = ADIS16480_CLK_INT;
-	st->ext_clk = devm_clk_get(dev, "sync");
-	if (!IS_ERR_OR_NULL(st->ext_clk)) {
+	st->ext_clk = devm_clk_get_optional(dev, "sync");
+	if (IS_ERR(st->ext_clk))
+		return dev_err_probe(dev, PTR_ERR(st->ext_clk), "failed to get ext clk\n");
+	if (st->ext_clk) {
 		st->clk_mode = ADIS16480_CLK_SYNC;
 		return 0;
 	}
 
-	if (PTR_ERR(st->ext_clk) != -ENOENT) {
-		dev_err(dev, "failed to get ext clk\n");
-		return PTR_ERR(st->ext_clk);
-	}
-
 	if (st->chip_info->has_pps_clk_mode) {
-		st->ext_clk = devm_clk_get(dev, "pps");
-		if (!IS_ERR_OR_NULL(st->ext_clk)) {
+		st->ext_clk = devm_clk_get_optional(dev, "pps");
+		if (IS_ERR(st->ext_clk))
+			return dev_err_probe(dev, PTR_ERR(st->ext_clk), "failed to get ext clk\n");
+		if (st->ext_clk) {
 			st->clk_mode = ADIS16480_CLK_PPS;
 			return 0;
 		}
-
-		if (PTR_ERR(st->ext_clk) != -ENOENT) {
-			dev_err(dev, "failed to get ext clk\n");
-			return PTR_ERR(st->ext_clk);
-		}
 	}
 
+	st->clk_mode = ADIS16480_CLK_INT;
 	return 0;
 }
 
@@ -1447,7 +1441,7 @@ static int adis16480_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	if (!IS_ERR_OR_NULL(st->ext_clk)) {
+	if (st->ext_clk) {
 		ret = adis16480_ext_clk_config(st, true);
 		if (ret)
 			return ret;
-- 
2.35.1