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SubjectRe: [PATCH v2] tty: xilinx_uartps: Correct return value in probe
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On 01. 03. 19 10:37, Rajan Vaja wrote:
> Existing driver checks for alternate clock if devm_clk_get() fails
> and returns error code for last clock failure. If xilinx_uartps is
> called before clock driver, devm_clk_get() returns -EPROBE_DEFER.
> In this case, probe should not check for alternate clock as main
> clock is already present in DTS and return -EPROBE_DEFER only.
>
> This patch fixes it by not checking for alternate clock when main
> clock get returns -EPROBE_DEFER.
>
> Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
> ---
> Changes in v2:
> * Handle dynamic port allocation error cases
> ---
> drivers/tty/serial/xilinx_uartps.c | 32 +++++++++++++++++++-------------
> 1 file changed, 19 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 094f295..f7ae73e 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1547,27 +1547,33 @@ static int cdns_uart_probe(struct platform_device *pdev)
> }
>
> cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
> + if (PTR_ERR(cdns_uart_data->pclk) == -EPROBE_DEFER) {
> + rc = PTR_ERR(cdns_uart_data->pclk);
> + goto err_out_unregister_driver;
> + }
> +
> if (IS_ERR(cdns_uart_data->pclk)) {
> cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
> - if (!IS_ERR(cdns_uart_data->pclk))
> - dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
> + if (IS_ERR(cdns_uart_data->pclk)) {
> + rc = PTR_ERR(cdns_uart_data->pclk);
> + goto err_out_unregister_driver;
> + }
> + dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
> }
> - if (IS_ERR(cdns_uart_data->pclk)) {
> - dev_err(&pdev->dev, "pclk clock not found.\n");
> - rc = PTR_ERR(cdns_uart_data->pclk);
> +
> + cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
> + if (PTR_ERR(cdns_uart_data->uartclk) == -EPROBE_DEFER) {
> + rc = PTR_ERR(cdns_uart_data->uartclk);
> goto err_out_unregister_driver;
> }
>
> - cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
> if (IS_ERR(cdns_uart_data->uartclk)) {
> cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "ref_clk");
> - if (!IS_ERR(cdns_uart_data->uartclk))
> - dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
> - }
> - if (IS_ERR(cdns_uart_data->uartclk)) {
> - dev_err(&pdev->dev, "uart_clk clock not found.\n");
> - rc = PTR_ERR(cdns_uart_data->uartclk);
> - goto err_out_unregister_driver;
> + if (IS_ERR(cdns_uart_data->uartclk)) {
> + rc = PTR_ERR(cdns_uart_data->uartclk);
> + goto err_out_unregister_driver;
> + }
> + dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
> }
>
> rc = clk_prepare_enable(cdns_uart_data->pclk);
>

Reviewed-by: Michal Simek <michal.simek@xilinx.com>

Thanks,
Michal

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