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Message-ID: <20240613163407.2147884-1-tgamblin@baylibre.com>
Date: Thu, 13 Jun 2024 12:34:06 -0400
From: Trevor Gamblin <tgamblin@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>
Cc: linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] iio: adc: adi-axi-adc: improve probe() error messaging
The current error handling for calls such as devm_clk_get_enabled() in
the adi-axi-adc probe() function means that, if a property such as
'clocks' (for example) is not present in the devicetree when booting a
kernel with the driver enabled, the resulting error message will be
vague, e.g.:
|adi_axi_adc 44a00000.backend: probe with driver adi_axi_adc failed with error -2
Change the devm_clk_get_enabled(), devm_regmap_init_mmio(), and
devm_iio_backend_register() checks to use dev_err_probe() with some
context for easier debugging.
After the fix:
|adi_axi_adc 44a00000.backend: error -ENOENT: failed to get clock
|adi_axi_adc 44a00000.backend: probe with driver adi_axi_adc failed with error -2
Signed-off-by: Trevor Gamblin <tgamblin@...libre.com>
---
drivers/iio/adc/adi-axi-adc.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 0cf0d81358fd..99998c2769d5 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -292,7 +292,8 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
st->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&axi_adc_regmap_config);
if (IS_ERR(st->regmap))
- return PTR_ERR(st->regmap);
+ return dev_err_probe(&pdev->dev, PTR_ERR(st->regmap),
+ "failed to init register map\n");
expected_ver = device_get_match_data(&pdev->dev);
if (!expected_ver)
@@ -300,7 +301,8 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(clk))
- return PTR_ERR(clk);
+ return dev_err_probe(&pdev->dev, PTR_ERR(clk),
+ "failed to get clock\n");
/*
* Force disable the core. Up to the frontend to enable us. And we can
@@ -328,7 +330,8 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
ret = devm_iio_backend_register(&pdev->dev, &adi_axi_adc_generic, st);
if (ret)
- return ret;
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to register iio backend\n");
dev_info(&pdev->dev, "AXI ADC IP core (%d.%.2d.%c) probed\n",
ADI_AXI_PCORE_VER_MAJOR(ver),
--
2.45.2
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