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* [PATCH] tty: xilinx_uartps: Correct return value in probe
@ 2018-12-04 12:51 Rajan Vaja
  2018-12-05 12:53 ` Michal Simek
  2019-03-01  9:37 ` [PATCH v2] " Rajan Vaja
  0 siblings, 2 replies; 4+ messages in thread
From: Rajan Vaja @ 2018-12-04 12:51 UTC (permalink / raw)
  To: gregkh, jslaby, michal.simek
  Cc: linux-kernel, jollys, anirudh, linux-serial, linux-arm-kernel,
	Rajan Vaja

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>
---
 drivers/tty/serial/xilinx_uartps.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 57c66d2..a23baa4 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1545,27 +1545,25 @@ 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)
+		return PTR_ERR(cdns_uart_data->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");
-		rc = PTR_ERR(cdns_uart_data->pclk);
-		goto err_out_unregister_driver;
+		if (IS_ERR(cdns_uart_data->pclk))
+			return PTR_ERR(cdns_uart_data->pclk);
+		dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
 	}
 
 	cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
+	if (PTR_ERR(cdns_uart_data->uartclk) == -EPROBE_DEFER)
+		return PTR_ERR(cdns_uart_data->uartclk);
+
 	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))
+			return PTR_ERR(cdns_uart_data->uartclk);
+		dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
 	}
 
 	rc = clk_prepare_enable(cdns_uart_data->pclk);
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH] tty: xilinx_uartps: Correct return value in probe
  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 ` [PATCH v2] " Rajan Vaja
  1 sibling, 0 replies; 4+ messages in thread
From: Michal Simek @ 2018-12-05 12:53 UTC (permalink / raw)
  To: Rajan Vaja, gregkh, jslaby, michal.simek
  Cc: linux-kernel, jollys, anirudh, linux-serial, linux-arm-kernel

On 04. 12. 18 13:51, 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>
> ---
>  drivers/tty/serial/xilinx_uartps.c | 26 ++++++++++++--------------
>  1 file changed, 12 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 57c66d2..a23baa4 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1545,27 +1545,25 @@ 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)
> +		return PTR_ERR(cdns_uart_data->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");
> -		rc = PTR_ERR(cdns_uart_data->pclk);
> -		goto err_out_unregister_driver;
> +		if (IS_ERR(cdns_uart_data->pclk))
> +			return PTR_ERR(cdns_uart_data->pclk);
> +		dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
>  	}
>  
>  	cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
> +	if (PTR_ERR(cdns_uart_data->uartclk) == -EPROBE_DEFER)
> +		return PTR_ERR(cdns_uart_data->uartclk);
> +
>  	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))
> +			return PTR_ERR(cdns_uart_data->uartclk);
> +		dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
>  	}
>  
>  	rc = clk_prepare_enable(cdns_uart_data->pclk);
> 

Nack. This is the origin version before dynamic port allocation.
Please look at Xilinx version which has this feature already and it is
resolved there properly.

Thanks,
Michal


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [PATCH v2] tty: xilinx_uartps: Correct return value in probe
  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
  2019-03-06 12:34   ` Michal Simek
  1 sibling, 1 reply; 4+ messages in thread
From: Rajan Vaja @ 2019-03-01  9:37 UTC (permalink / raw)
  To: gregkh, jslaby, michals
  Cc: rajan.vaja, linux-kernel, JOLLYS, anirudh, linux-serial,
	linux-arm-kernel

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


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH v2] tty: xilinx_uartps: Correct return value in probe
  2019-03-01  9:37 ` [PATCH v2] " Rajan Vaja
@ 2019-03-06 12:34   ` Michal Simek
  0 siblings, 0 replies; 4+ messages in thread
From: Michal Simek @ 2019-03-06 12:34 UTC (permalink / raw)
  To: Rajan Vaja, gregkh, jslaby
  Cc: linux-kernel, JOLLYS, anirudh, linux-serial, linux-arm-kernel

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

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-03-06 12:35 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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 ` [PATCH v2] " Rajan Vaja
2019-03-06 12:34   ` Michal Simek

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