Re: [PATCH v3 2/3] serial: 8250_dw: Use new dev variable in probe

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Fri, 2016-07-15 at 19:01 +0800, Kefeng Wang wrote:
> Use new dev variable instead of pdev->dev and p->dev in probe
> function.

I'm not sure we need this one. What is wrong with &pdev->dev?

> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
>  drivers/tty/serial/8250/8250_dw.c | 45 ++++++++++++++++++++--------
> -----------
>  1 file changed, 23 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_dw.c
> b/drivers/tty/serial/8250/8250_dw.c
> index 65f3da7..d6934310 100644
> --- a/drivers/tty/serial/8250/8250_dw.c
> +++ b/drivers/tty/serial/8250/8250_dw.c
> @@ -358,18 +358,19 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  	struct resource *regs = platform_get_resource(pdev,
> IORESOURCE_MEM, 0);
>  	int irq = platform_get_irq(pdev, 0);
>  	struct uart_port *p = &uart.port;
> +	struct device *dev = &pdev->dev;
>  	struct dw8250_data *data;
>  	int err;
>  	u32 val;
>  
>  	if (!regs) {
> -		dev_err(&pdev->dev, "no registers defined\n");
> +		dev_err(dev, "no registers defined\n");
>  		return -EINVAL;
>  	}
>  
>  	if (irq < 0) {
>  		if (irq != -EPROBE_DEFER)
> -			dev_err(&pdev->dev, "cannot get irq\n");
> +			dev_err(dev, "cannot get irq\n");
>  		return irq;
>  	}
>  
> @@ -380,17 +381,17 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  	p->pm		= dw8250_do_pm;
>  	p->type		= PORT_8250;
>  	p->flags	= UPF_SHARE_IRQ | UPF_FIXED_PORT;
> -	p->dev		= &pdev->dev;
> +	p->dev		= dev;
>  	p->iotype	= UPIO_MEM;
>  	p->serial_in	= dw8250_serial_in;
>  	p->serial_out	= dw8250_serial_out;
>  	p->set_termios	= dw8250_set_termios;
>  
> -	p->membase = devm_ioremap(&pdev->dev, regs->start,
> resource_size(regs));
> +	p->membase = devm_ioremap(dev, regs->start,
> resource_size(regs));
>  	if (!p->membase)
>  		return -ENOMEM;
>  
> -	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
>  	if (!data)
>  		return -ENOMEM;
>  
> @@ -398,57 +399,57 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  	data->usr_reg = DW_UART_USR;
>  	p->private_data = data;
>  
> -	data->uart_16550_compatible = device_property_read_bool(p-
> >dev,
> +	data->uart_16550_compatible = device_property_read_bool(dev,
>  						"snps,uart-16550-
> compatible");
>  
> -	err = device_property_read_u32(p->dev, "reg-shift", &val);
> +	err = device_property_read_u32(dev, "reg-shift", &val);
>  	if (!err)
>  		p->regshift = val;
>  
> -	err = device_property_read_u32(p->dev, "reg-io-width", &val);
> +	err = device_property_read_u32(dev, "reg-io-width", &val);
>  	if (!err && val == 4) {
>  		p->iotype = UPIO_MEM32;
>  		p->serial_in = dw8250_serial_in32;
>  		p->serial_out = dw8250_serial_out32;
>  	}
>  
> -	if (device_property_read_bool(p->dev, "dcd-override")) {
> +	if (device_property_read_bool(dev, "dcd-override")) {
>  		/* Always report DCD as active */
>  		data->msr_mask_on |= UART_MSR_DCD;
>  		data->msr_mask_off |= UART_MSR_DDCD;
>  	}
>  
> -	if (device_property_read_bool(p->dev, "dsr-override")) {
> +	if (device_property_read_bool(dev, "dsr-override")) {
>  		/* Always report DSR as active */
>  		data->msr_mask_on |= UART_MSR_DSR;
>  		data->msr_mask_off |= UART_MSR_DDSR;
>  	}
>  
> -	if (device_property_read_bool(p->dev, "cts-override")) {
> +	if (device_property_read_bool(dev, "cts-override")) {
>  		/* Always report CTS as active */
>  		data->msr_mask_on |= UART_MSR_CTS;
>  		data->msr_mask_off |= UART_MSR_DCTS;
>  	}
>  
> -	if (device_property_read_bool(p->dev, "ri-override")) {
> +	if (device_property_read_bool(dev, "ri-override")) {
>  		/* Always report Ring indicator as inactive */
>  		data->msr_mask_off |= UART_MSR_RI;
>  		data->msr_mask_off |= UART_MSR_TERI;
>  	}
>  
>  	/* Always ask for fixed clock rate from a property. */
> -	device_property_read_u32(p->dev, "clock-frequency", &p-
> >uartclk);
> +	device_property_read_u32(dev, "clock-frequency", &p-
> >uartclk);
>  
>  	/* If there is separate baudclk, get the rate from it. */
> -	data->clk = devm_clk_get(&pdev->dev, "baudclk");
> +	data->clk = devm_clk_get(dev, "baudclk");
>  	if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER)
> -		data->clk = devm_clk_get(&pdev->dev, NULL);
> +		data->clk = devm_clk_get(dev, NULL);
>  	if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER)
>  		return -EPROBE_DEFER;
>  	if (!IS_ERR_OR_NULL(data->clk)) {
>  		err = clk_prepare_enable(data->clk);
>  		if (err)
> -			dev_warn(&pdev->dev, "could not enable
> optional baudclk: %d\n",
> +			dev_warn(dev, "could not enable optional
> baudclk: %d\n",
>  				 err);
>  		else
>  			p->uartclk = clk_get_rate(data->clk);
> @@ -456,11 +457,11 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  
>  	/* If no clock rate is defined, fail. */
>  	if (!p->uartclk) {
> -		dev_err(&pdev->dev, "clock rate not defined\n");
> +		dev_err(dev, "clock rate not defined\n");
>  		return -EINVAL;
>  	}
>  
> -	data->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
> +	data->pclk = devm_clk_get(dev, "apb_pclk");
>  	if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER)
> {
>  		err = -EPROBE_DEFER;
>  		goto err_clk;
> @@ -468,12 +469,12 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  	if (!IS_ERR(data->pclk)) {
>  		err = clk_prepare_enable(data->pclk);
>  		if (err) {
> -			dev_err(&pdev->dev, "could not enable
> apb_pclk\n");
> +			dev_err(dev, "could not enable apb_pclk\n");
>  			goto err_clk;
>  		}
>  	}
>  
> -	data->rst = devm_reset_control_get_optional(&pdev->dev,
> NULL);
> +	data->rst = devm_reset_control_get_optional(dev, NULL);
>  	if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER)
> {
>  		err = -EPROBE_DEFER;
>  		goto err_pclk;
> @@ -505,8 +506,8 @@ static int dw8250_probe(struct platform_device
> *pdev)
>  
>  	platform_set_drvdata(pdev, data);
>  
> -	pm_runtime_set_active(&pdev->dev);
> -	pm_runtime_enable(&pdev->dev);
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
>  
>  	return 0;
>  

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy