From: Rajan Vaja <rajan.vaja@xilinx.com>
To: <gregkh@linuxfoundation.org>, <jslaby@suse.com>, <michals@xilinx.com>
Cc: linux-serial@vger.kernel.org, rajan.vaja@xilinx.com,
linux-kernel@vger.kernel.org, JOLLYS@xilinx.com,
anirudh@xilinx.com, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] tty: xilinx_uartps: Correct return value in probe
Date: Fri, 1 Mar 2019 01:37:08 -0800 [thread overview]
Message-ID: <1551433028-25207-1-git-send-email-rajan.vaja@xilinx.com> (raw)
In-Reply-To: <1543927882-15091-1-git-send-email-rajan.vaja@xilinx.com>
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);
--
2.7.4
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next prev parent reply other threads:[~2019-03-01 9:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-04 12:51 [PATCH] tty: xilinx_uartps: Correct return value in probe Rajan Vaja
2018-12-05 12:53 ` Michal Simek
2019-03-01 9:37 ` Rajan Vaja [this message]
2019-03-06 12:34 ` [PATCH v2] " Michal Simek
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