i2c: stm32: don't print an error on probe deferral

Do not print an error trace when deferring probe for some resource.
Fix as well the error message in case of tx dma_request_chan failure.
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-stm32.c

@@ -25,8 +25,9 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
 	/* Request and configure I2C TX dma channel */
 	dma->chan_tx = dma_request_chan(dev, "tx");
 	if (IS_ERR(dma->chan_tx)) {
-		dev_dbg(dev, "can't request DMA tx channel\n");
 		ret = PTR_ERR(dma->chan_tx);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "can't request DMA tx channel\n");
 		goto fail_al;
 	}
 
@@ -44,8 +45,10 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
 	/* Request and configure I2C RX dma channel */
 	dma->chan_rx = dma_request_chan(dev, "rx");
 	if (IS_ERR(dma->chan_rx)) {
-		dev_err(dev, "can't request DMA rx channel\n");
 		ret = PTR_ERR(dma->chan_rx);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "can't request DMA rx channel\n");
+
 		goto fail_tx;
 	}
 
@@ -73,6 +76,7 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
 	dma_release_channel(dma->chan_tx);
 fail_al:
 	devm_kfree(dev, dma);
+	if (ret != -EPROBE_DEFER)
 		dev_info(dev, "can't use DMA\n");
 
 	return ERR_PTR(ret);

drivers/i2c/busses/i2c-stm32f4.c

@@ -797,8 +797,10 @@ static int stm32f4_i2c_probe(struct platform_device *pdev)
 
 	rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(rst)) {
-		dev_err(&pdev->dev, "Error: Missing controller reset\n");
 		ret = PTR_ERR(rst);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
+
 		goto clk_free;
 	}
 	reset_control_assert(rst);

drivers/i2c/busses/i2c-stm32f7.c

@@ -1967,7 +1967,8 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(i2c_dev->clk)) {
-		dev_err(&pdev->dev, "Error: Missing controller clock\n");
+		if (PTR_ERR(i2c_dev->clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get controller clock\n");
 		return PTR_ERR(i2c_dev->clk);
 	}
 
@@ -1979,8 +1980,10 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	rst = devm_reset_control_get(&pdev->dev, NULL);
 	if (IS_ERR(rst)) {
-		dev_err(&pdev->dev, "Error: Missing controller reset\n");
 		ret = PTR_ERR(rst);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
+
 		goto clk_free;
 	}
 	reset_control_assert(rst);