linux-kernel - Re: [PATCH v2 2/3] i2c: qcom-geni: Grow a dev pointer to simplify code

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Date:   Tue, 10 Mar 2020 12:41:54 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, linux-i2c@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Alok Chauhan <alokc@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        Brendan Higgins <brendanhiggins@...gle.com>
Subject: Re: [PATCH v2 2/3] i2c: qcom-geni: Grow a dev pointer to simplify
 code

On Tue 10 Mar 08:43 PDT 2020, Stephen Boyd wrote:

> Some lines are long here. Use a struct dev pointer to shorten lines and
> simplify code. The clk_get() call can fail because of EPROBE_DEFER
> problems too, so just remove the error print message because it isn't
> useful. Finally, platform_get_irq() already prints an error so just
> remove that error message.
> 
> Cc: Alok Chauhan <alokc@...eaurora.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  drivers/i2c/busses/i2c-qcom-geni.c | 57 ++++++++++++++----------------
>  1 file changed, 26 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index 4efca130035a..2f5fb2e83f95 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -502,45 +502,40 @@ static int geni_i2c_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	u32 proto, tx_depth;
>  	int ret;
> +	struct device *dev = &pdev->dev;
>  
> -	gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL);
> +	gi2c = devm_kzalloc(dev, sizeof(*gi2c), GFP_KERNEL);
>  	if (!gi2c)
>  		return -ENOMEM;
>  
> -	gi2c->se.dev = &pdev->dev;
> -	gi2c->se.wrapper = dev_get_drvdata(pdev->dev.parent);
> +	gi2c->se.dev = dev;
> +	gi2c->se.wrapper = dev_get_drvdata(dev->parent);
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	gi2c->se.base = devm_ioremap_resource(&pdev->dev, res);
> +	gi2c->se.base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(gi2c->se.base))
>  		return PTR_ERR(gi2c->se.base);
>  
> -	gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
> -	if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(&pdev->dev)) {
> -		ret = PTR_ERR(gi2c->se.clk);
> -		dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);

Afaict this line would still be useful, although it might need the usual
probe deferral exception(?)

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> -		return ret;
> -	}
> +	gi2c->se.clk = devm_clk_get(dev, "se");
> +	if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(dev))
> +		return PTR_ERR(gi2c->se.clk);
>  
> -	ret = device_property_read_u32(&pdev->dev, "clock-frequency",
> -							&gi2c->clk_freq_out);
> +	ret = device_property_read_u32(dev, "clock-frequency",
> +				       &gi2c->clk_freq_out);
>  	if (ret) {
> -		dev_info(&pdev->dev,
> -			"Bus frequency not specified, default to 100kHz.\n");
> +		dev_info(dev, "Bus frequency not specified, default to 100kHz.\n");
>  		gi2c->clk_freq_out = KHZ(100);
>  	}
>  
> -	if (has_acpi_companion(&pdev->dev))
> -		ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
> +	if (has_acpi_companion(dev))
> +		ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(dev));
>  
>  	gi2c->irq = platform_get_irq(pdev, 0);
> -	if (gi2c->irq < 0) {
> -		dev_err(&pdev->dev, "IRQ error for i2c-geni\n");
> +	if (gi2c->irq < 0)
>  		return gi2c->irq;
> -	}
>  
>  	ret = geni_i2c_clk_map_idx(gi2c);
>  	if (ret) {
> -		dev_err(&pdev->dev, "Invalid clk frequency %d Hz: %d\n",
> +		dev_err(dev, "Invalid clk frequency %d Hz: %d\n",
>  			gi2c->clk_freq_out, ret);
>  		return ret;
>  	}
> @@ -549,29 +544,29 @@ static int geni_i2c_probe(struct platform_device *pdev)
>  	init_completion(&gi2c->done);
>  	spin_lock_init(&gi2c->lock);
>  	platform_set_drvdata(pdev, gi2c);
> -	ret = devm_request_irq(&pdev->dev, gi2c->irq, geni_i2c_irq, 0,
> -			       dev_name(&pdev->dev), gi2c);
> +	ret = devm_request_irq(dev, gi2c->irq, geni_i2c_irq, 0,
> +			       dev_name(dev), gi2c);
>  	if (ret) {
> -		dev_err(&pdev->dev, "Request_irq failed:%d: err:%d\n",
> +		dev_err(dev, "Request_irq failed:%d: err:%d\n",
>  			gi2c->irq, ret);
>  		return ret;
>  	}
>  	/* Disable the interrupt so that the system can enter low-power mode */
>  	disable_irq(gi2c->irq);
>  	i2c_set_adapdata(&gi2c->adap, gi2c);
> -	gi2c->adap.dev.parent = &pdev->dev;
> -	gi2c->adap.dev.of_node = pdev->dev.of_node;
> +	gi2c->adap.dev.parent = dev;
> +	gi2c->adap.dev.of_node = dev->of_node;
>  	strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
>  
>  	ret = geni_se_resources_on(&gi2c->se);
>  	if (ret) {
> -		dev_err(&pdev->dev, "Error turning on resources %d\n", ret);
> +		dev_err(dev, "Error turning on resources %d\n", ret);
>  		return ret;
>  	}
>  	proto = geni_se_read_proto(&gi2c->se);
>  	tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);
>  	if (proto != GENI_SE_I2C) {
> -		dev_err(&pdev->dev, "Invalid proto %d\n", proto);
> +		dev_err(dev, "Invalid proto %d\n", proto);
>  		geni_se_resources_off(&gi2c->se);
>  		return -ENXIO;
>  	}
> @@ -581,11 +576,11 @@ static int geni_i2c_probe(struct platform_device *pdev)
>  							true, true, true);
>  	ret = geni_se_resources_off(&gi2c->se);
>  	if (ret) {
> -		dev_err(&pdev->dev, "Error turning off resources %d\n", ret);
> +		dev_err(dev, "Error turning off resources %d\n", ret);
>  		return ret;
>  	}
>  
> -	dev_dbg(&pdev->dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
> +	dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
>  
>  	gi2c->suspended = 1;
>  	pm_runtime_set_suspended(gi2c->se.dev);
> @@ -595,12 +590,12 @@ static int geni_i2c_probe(struct platform_device *pdev)
>  
>  	ret = i2c_add_adapter(&gi2c->adap);
>  	if (ret) {
> -		dev_err(&pdev->dev, "Error adding i2c adapter %d\n", ret);
> +		dev_err(dev, "Error adding i2c adapter %d\n", ret);
>  		pm_runtime_disable(gi2c->se.dev);
>  		return ret;
>  	}
>  
> -	dev_dbg(&pdev->dev, "Geni-I2C adaptor successfully added\n");
> +	dev_dbg(dev, "Geni-I2C adaptor successfully added\n");
>  
>  	return 0;
>  }
> -- 
> Sent by a computer, using git, on the internet
>