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Subject[PATCH] [RFC] i2c: imx: make use of format specifier %dE
Date
I created a patch that teaches printk et al to emit a symbolic error
name for an error valued integer[1]. With that applied

dev_err(&pdev->dev, "can't enable I2C clock, ret=%dE\n", ret);

emits

... can't enable I2C clock, ret=EIO

if ret is -EIO. Petr Mladek (i.e. one of the printk maintainers) had
concerns if this would be well received and worth the effort. He asked
to present it to a few subsystems. So for now, this patch converting the
i2c-imx driver shouldn't be applied yet but it would be great to get
some feedback about if you think that being able to easily printk (for
example) "EIO" instead of "-5" is a good idea. Would it help you? Do you
think it helps your users?

Thanks
Uwe

[1] https://lkml.org/lkml/2019/8/27/1456
---
drivers/i2c/busses/i2c-imx.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 15f6cde6452f..359e911cb891 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -289,7 +289,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
if (IS_ERR(dma->chan_tx)) {
ret = PTR_ERR(dma->chan_tx);
if (ret != -ENODEV && ret != -EPROBE_DEFER)
- dev_err(dev, "can't request DMA tx channel (%d)\n", ret);
+ dev_err(dev, "can't request DMA tx channel (%dE)\n", ret);
goto fail_al;
}

@@ -300,7 +300,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_sconfig.direction = DMA_MEM_TO_DEV;
ret = dmaengine_slave_config(dma->chan_tx, &dma_sconfig);
if (ret < 0) {
- dev_err(dev, "can't configure tx channel (%d)\n", ret);
+ dev_err(dev, "can't configure tx channel (%dE)\n", ret);
goto fail_tx;
}

@@ -308,7 +308,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
if (IS_ERR(dma->chan_rx)) {
ret = PTR_ERR(dma->chan_rx);
if (ret != -ENODEV && ret != -EPROBE_DEFER)
- dev_err(dev, "can't request DMA rx channel (%d)\n", ret);
+ dev_err(dev, "can't request DMA rx channel (%dE)\n", ret);
goto fail_tx;
}

@@ -319,7 +319,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_sconfig.direction = DMA_DEV_TO_MEM;
ret = dmaengine_slave_config(dma->chan_rx, &dma_sconfig);
if (ret < 0) {
- dev_err(dev, "can't configure rx channel (%d)\n", ret);
+ dev_err(dev, "can't configure rx channel (%dE)\n", ret);
goto fail_rx;
}

@@ -964,7 +964,7 @@ static int i2c_imx_xfer(struct i2c_adapter *adapter,
pm_runtime_put_autosuspend(i2c_imx->adapter.dev.parent);

out:
- dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
+ dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %dE\n", __func__,
(result < 0) ? "error" : "success msg",
(result < 0) ? result : num);
return (result < 0) ? result : num;
@@ -1100,7 +1100,7 @@ static int i2c_imx_probe(struct platform_device *pdev)

ret = clk_prepare_enable(i2c_imx->clk);
if (ret) {
- dev_err(&pdev->dev, "can't enable I2C clock, ret=%d\n", ret);
+ dev_err(&pdev->dev, "can't enable I2C clock, ret=%dE\n", ret);
return ret;
}

@@ -1108,7 +1108,7 @@ static int i2c_imx_probe(struct platform_device *pdev)
ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, IRQF_SHARED,
pdev->name, i2c_imx);
if (ret) {
- dev_err(&pdev->dev, "can't claim irq %d\n", irq);
+ dev_err(&pdev->dev, "can't claim irq %dE\n", irq);
goto clk_disable;
}

@@ -1230,7 +1230,7 @@ static int __maybe_unused i2c_imx_runtime_resume(struct device *dev)

ret = clk_enable(i2c_imx->clk);
if (ret)
- dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);
+ dev_err(dev, "can't enable I2C clock, ret=%dE\n", ret);

return ret;
}
--
2.23.0
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