Re: [PATCH v3 08/18] iio: adc: stm32: Simplify with dev_err_probe()
From: Jonathan Cameron
Date: Wed Sep 09 2020 - 14:36:18 EST
On Sat, 29 Aug 2020 08:47:16 +0200
Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
> Common pattern of handling deferred probe can be simplified with
> dev_err_probe(). Less code and also it prints the error value.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
>
I don't have the thread to hand, but this tripped a warning next
and the patch was dropped as a result. See below.
Jonathan
> ---
>
> Changes since v2:
> 1. Wrap dev_err_probe() lines at 80 character
>
> Changes since v1:
> 1. Convert to devm_clk_get_optional
> 2. Update also stm32-dfsdm-core and stm32-dac-core.
> 3. Wrap around 100 characters (accepted by checkpatch).
> ---
> drivers/iio/adc/stm32-adc-core.c | 75 ++++++++++--------------------
> drivers/iio/adc/stm32-adc.c | 10 ++--
> drivers/iio/adc/stm32-dfsdm-adc.c | 10 ++--
> drivers/iio/adc/stm32-dfsdm-core.c | 9 ++--
> drivers/iio/dac/stm32-dac-core.c | 5 +-
> 5 files changed, 35 insertions(+), 74 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
> index 0e2068ec068b..3f27b4817a42 100644
> --- a/drivers/iio/adc/stm32-adc-core.c
> +++ b/drivers/iio/adc/stm32-adc-core.c
> @@ -582,11 +582,9 @@ static int stm32_adc_core_switches_probe(struct device *dev,
> priv->syscfg = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
> if (IS_ERR(priv->syscfg)) {
> ret = PTR_ERR(priv->syscfg);
> - if (ret != -ENODEV) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev, "Can't probe syscfg: %d\n", ret);
> - return ret;
> - }
> + if (ret != -ENODEV)
> + return dev_err_probe(dev, ret, "Can't probe syscfg\n");
> +
> priv->syscfg = NULL;
> }
>
> @@ -596,12 +594,9 @@ static int stm32_adc_core_switches_probe(struct device *dev,
> priv->booster = devm_regulator_get_optional(dev, "booster");
> if (IS_ERR(priv->booster)) {
> ret = PTR_ERR(priv->booster);
> - if (ret != -ENODEV) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev, "can't get booster %d\n",
> - ret);
> - return ret;
> - }
> + if (ret != -ENODEV)
> + dev_err_probe(dev, ret, "can't get booster\n");
This tripped a warning and got the patch dropped because we no longer
return on error.
> +
> priv->booster = NULL;
> }
> }
> @@ -612,11 +607,9 @@ static int stm32_adc_core_switches_probe(struct device *dev,
> priv->vdd = devm_regulator_get_optional(dev, "vdd");
> if (IS_ERR(priv->vdd)) {
> ret = PTR_ERR(priv->vdd);
> - if (ret != -ENODEV) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev, "can't get vdd %d\n", ret);
> - return ret;
> - }
> + if (ret != -ENODEV)
> + return dev_err_probe(dev, ret, "can't get vdd\n");
> +
> priv->vdd = NULL;
> }
> }
> @@ -669,42 +662,24 @@ static int stm32_adc_probe(struct platform_device *pdev)
> priv->common.phys_base = res->start;
>
> priv->vdda = devm_regulator_get(&pdev->dev, "vdda");
> - if (IS_ERR(priv->vdda)) {
> - ret = PTR_ERR(priv->vdda);
> - if (ret != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "vdda get failed, %d\n", ret);
> - return ret;
> - }
> + if (IS_ERR(priv->vdda))
> + return dev_err_probe(&pdev->dev, PTR_ERR(priv->vdda),
> + "vdda get failed\n");
>
> priv->vref = devm_regulator_get(&pdev->dev, "vref");
> - if (IS_ERR(priv->vref)) {
> - ret = PTR_ERR(priv->vref);
> - if (ret != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "vref get failed, %d\n", ret);
> - return ret;
> - }
> -
> - priv->aclk = devm_clk_get(&pdev->dev, "adc");
> - if (IS_ERR(priv->aclk)) {
> - ret = PTR_ERR(priv->aclk);
> - if (ret != -ENOENT) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "Can't get 'adc' clock\n");
> - return ret;
> - }
> - priv->aclk = NULL;
> - }
> -
> - priv->bclk = devm_clk_get(&pdev->dev, "bus");
> - if (IS_ERR(priv->bclk)) {
> - ret = PTR_ERR(priv->bclk);
> - if (ret != -ENOENT) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "Can't get 'bus' clock\n");
> - return ret;
> - }
> - priv->bclk = NULL;
> - }
> + if (IS_ERR(priv->vref))
> + return dev_err_probe(&pdev->dev, PTR_ERR(priv->vref),
> + "vref get failed\n");
> +
> + priv->aclk = devm_clk_get_optional(&pdev->dev, "adc");
> + if (IS_ERR(priv->aclk))
> + return dev_err_probe(&pdev->dev, PTR_ERR(priv->aclk),
> + "Can't get 'adc' clock\n");
> +
> + priv->bclk = devm_clk_get_optional(&pdev->dev, "bus");
> + if (IS_ERR(priv->bclk))
> + return dev_err_probe(&pdev->dev, PTR_ERR(priv->bclk),
> + "Can't get 'bus' clock\n");
>
> ret = stm32_adc_core_switches_probe(dev, priv);
> if (ret)
> diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
> index 3eb9ebe8372f..b3f31f147347 100644
> --- a/drivers/iio/adc/stm32-adc.c
> +++ b/drivers/iio/adc/stm32-adc.c
> @@ -1805,13 +1805,9 @@ static int stm32_adc_dma_request(struct device *dev, struct iio_dev *indio_dev)
> adc->dma_chan = dma_request_chan(dev, "rx");
> if (IS_ERR(adc->dma_chan)) {
> ret = PTR_ERR(adc->dma_chan);
> - if (ret != -ENODEV) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev,
> - "DMA channel request failed with %d\n",
> - ret);
> - return ret;
> - }
> + if (ret != -ENODEV)
> + return dev_err_probe(dev, ret,
> + "DMA channel request failed with\n");
>
> /* DMA is optional: fall back to IRQ mode */
> adc->dma_chan = NULL;
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 5e10fb4f3704..c7e0109315f8 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -1473,13 +1473,9 @@ static int stm32_dfsdm_adc_init(struct device *dev, struct iio_dev *indio_dev)
> /* Optionally request DMA */
> ret = stm32_dfsdm_dma_request(dev, indio_dev);
> if (ret) {
> - if (ret != -ENODEV) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev,
> - "DMA channel request failed with %d\n",
> - ret);
> - return ret;
> - }
> + if (ret != -ENODEV)
> + return dev_err_probe(dev, ret,
> + "DMA channel request failed with\n");
>
> dev_dbg(dev, "No DMA support\n");
> return 0;
> diff --git a/drivers/iio/adc/stm32-dfsdm-core.c b/drivers/iio/adc/stm32-dfsdm-core.c
> index 26e2011c5868..0b8bea88b011 100644
> --- a/drivers/iio/adc/stm32-dfsdm-core.c
> +++ b/drivers/iio/adc/stm32-dfsdm-core.c
> @@ -243,12 +243,9 @@ static int stm32_dfsdm_parse_of(struct platform_device *pdev,
> * on use case.
> */
> priv->clk = devm_clk_get(&pdev->dev, "dfsdm");
> - if (IS_ERR(priv->clk)) {
> - ret = PTR_ERR(priv->clk);
> - if (ret != -EPROBE_DEFER)
> - dev_err(&pdev->dev, "Failed to get clock (%d)\n", ret);
> - return ret;
> - }
> + if (IS_ERR(priv->clk))
> + return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk),
> + "Failed to get clock\n");
>
> priv->aclk = devm_clk_get(&pdev->dev, "audio");
> if (IS_ERR(priv->aclk))
> diff --git a/drivers/iio/dac/stm32-dac-core.c b/drivers/iio/dac/stm32-dac-core.c
> index 7e5809ba0dee..906436780347 100644
> --- a/drivers/iio/dac/stm32-dac-core.c
> +++ b/drivers/iio/dac/stm32-dac-core.c
> @@ -150,10 +150,7 @@ static int stm32_dac_probe(struct platform_device *pdev)
> rst = devm_reset_control_get_optional_exclusive(dev, NULL);
> if (rst) {
> if (IS_ERR(rst)) {
> - ret = PTR_ERR(rst);
> - if (ret != -EPROBE_DEFER)
> - dev_err(dev, "reset get failed, %d\n", ret);
> -
> + ret = dev_err_probe(dev, PTR_ERR(rst), "reset get failed\n");
> goto err_hw_stop;
> }
>