linux-kernel - Re: [PATCH v5 4/8] serial: qcom-geni: move resource initialization to separate function

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Message-ID: <0157bafe-fe94-4d57-a3ea-3501b35cc940@linaro.org>
Date: Tue, 3 Jun 2025 15:24:39 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Praveen Talari <quic_ptalari@...cinc.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
 devicetree@...r.kernel.org
Cc: psodagud@...cinc.com, djaggi@...cinc.com, quic_msavaliy@...cinc.com,
 quic_vtanuku@...cinc.com, quic_arandive@...cinc.com,
 quic_mnaresh@...cinc.com, quic_shazhuss@...cinc.com
Subject: Re: [PATCH v5 4/8] serial: qcom-geni: move resource initialization to
 separate function

On 06/05/2025 19:02, Praveen Talari wrote:
> Enhances code readability and future modifications within the new API.
> 
> Move the code that handles the actual initialization of resources
> like clock and ICC paths to a separate function, making the
> probe function cleaner.
> 
> Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>
> ---
> v3 -> v4
> - added version log after ---
> 
> v1 -> v2
> - updated subject description.
> - added a new line after function end
> ---
>   drivers/tty/serial/qcom_geni_serial.c | 66 ++++++++++++++++-----------
>   1 file changed, 40 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 0293b6210aa6..6ad759146f71 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -1588,6 +1588,43 @@ static struct uart_driver qcom_geni_uart_driver = {
>   	.nr =  GENI_UART_PORTS,
>   };
> 
> +static int geni_serial_resource_init(struct qcom_geni_serial_port *port)
> +{
> +	int ret;
> +
> +	port->se.clk = devm_clk_get(port->se.dev, "se");
> +	if (IS_ERR(port->se.clk)) {
> +		ret = PTR_ERR(port->se.clk);
> +		dev_err(port->se.dev, "Err getting SE Core clk %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = geni_icc_get(&port->se, NULL);
> +	if (ret)
> +		return ret;
> +
> +	port->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
> +	port->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
> +
> +	/* Set BW for register access */
> +	ret = geni_icc_set_bw(&port->se);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_pm_opp_set_clkname(port->se.dev, "se");
> +	if (ret)
> +		return ret;
> +
> +	/* OPP table is optional */
> +	ret = devm_pm_opp_of_add_table(port->se.dev);
> +	if (ret && ret != -ENODEV) {
> +		dev_err(port->se.dev, "invalid OPP table in device tree\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>   static void qcom_geni_serial_pm(struct uart_port *uport,
>   		unsigned int new_state, unsigned int old_state)
>   {
> @@ -1690,12 +1727,10 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>   	port->dev_data = data;
>   	port->se.dev = &pdev->dev;
>   	port->se.wrapper = dev_get_drvdata(pdev->dev.parent);
> -	port->se.clk = devm_clk_get(&pdev->dev, "se");
> -	if (IS_ERR(port->se.clk)) {
> -		ret = PTR_ERR(port->se.clk);
> -		dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
> +
> +	ret = geni_serial_resource_init(port);
> +	if (ret)
>   		return ret;
> -	}
> 
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   	if (!res)
> @@ -1713,17 +1748,6 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>   			return -ENOMEM;
>   	}
> 
> -	ret = geni_icc_get(&port->se, NULL);
> -	if (ret)
> -		return ret;
> -	port->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
> -	port->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
> -
> -	/* Set BW for register access */
> -	ret = geni_icc_set_bw(&port->se);
> -	if (ret)
> -		return ret;
> -
>   	port->name = devm_kasprintf(uport->dev, GFP_KERNEL,
>   			"qcom_geni_serial_%s%d",
>   			uart_console(uport) ? "console" : "uart", uport->line);
> @@ -1745,16 +1769,6 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>   	if (of_property_read_bool(pdev->dev.of_node, "cts-rts-swap"))
>   		port->cts_rts_swap = true;
> 
> -	ret = devm_pm_opp_set_clkname(&pdev->dev, "se");
> -	if (ret)
> -		return ret;
> -	/* OPP table is optional */
> -	ret = devm_pm_opp_of_add_table(&pdev->dev);
> -	if (ret && ret != -ENODEV) {
> -		dev_err(&pdev->dev, "invalid OPP table in device tree\n");
> -		return ret;
> -	}
> -
>   	port->private_data.drv = drv;
>   	uport->private_data = &port->private_data;
>   	platform_set_drvdata(pdev, port);
> --
> 2.17.1
> 
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>