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Message-ID: <20240617151820.3337034-1-tgamblin@baylibre.com>
Date: Mon, 17 Jun 2024 11:18:19 -0400
From: Trevor Gamblin <tgamblin@...libre.com>
To: Nuno Sa <nuno.sa@...log.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>
Cc: Trevor Gamblin <tgamblin@...libre.com>,
Angelo Dureghello <adureghello@...libre.com>,
linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] iio: dac: adi-axi-dac: improve probe() error messaging
The current error handling for calls such as devm_clk_get_enabled() in
the adi-axi-dac 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_dac 44a00000.dac: probe with driver adi_axi_dac 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 change:
|adi_axi_dac 44a00000.dac: error -ENOENT: failed to get clock
|adi_axi_dac 44a00000.dac: probe with driver adi_axi_dac failed with error -2
Suggested-by: Nuno Sa <nuno.sa@...log.com>
Tested-by: Angelo Dureghello <adureghello@...libre.com>
Signed-off-by: Trevor Gamblin <tgamblin@...libre.com>
---
Added Angelo as Tested-by since he tested the patch on an internal
setup.
---
drivers/iio/dac/adi-axi-dac.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index 880d83a014a1..6d56428e623d 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -545,7 +545,8 @@ static int axi_dac_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");
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
@@ -555,7 +556,8 @@ static int axi_dac_probe(struct platform_device *pdev)
st->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&axi_dac_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");
/*
* Force disable the core. Up to the frontend to enable us. And we can
@@ -601,7 +603,8 @@ static int axi_dac_probe(struct platform_device *pdev)
mutex_init(&st->lock);
ret = devm_iio_backend_register(&pdev->dev, &axi_dac_generic, st);
if (ret)
- return ret;
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to register iio backend\n");
dev_info(&pdev->dev, "AXI DAC IP core (%d.%.2d.%c) probed\n",
ADI_AXI_PCORE_VER_MAJOR(ver),
--
2.45.2
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