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tty: xilinx_uartps: Correct return value in probe 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Rajan Vaja 2019-03-01 01:37:08 -08:00 committed by Greg Kroah-Hartman
parent 5b9cea15a3
commit f694936c3b
1 changed files with 20 additions and 14 deletions
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34
drivers/tty/serial/xilinx_uartps.c
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@ -1553,29 +1553,35 @@ static int cdns_uart_probe(struct platform_device *pdev)
}
cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
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)) {
dev_err(&pdev->dev, "pclk clock not found.\n");
if (PTR_ERR(cdns_uart_data->pclk) == -EPROBE_DEFER) {
rc = PTR_ERR(cdns_uart_data->pclk);
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->pclk)) {
cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
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->uartclk)) {
dev_err(&pdev->dev, "uart_clk clock not found.\n");
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;
}
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)) {
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);
if (rc) {
dev_err(&pdev->dev, "Unable to enable pclk clock.\n");