[PATCH v3 0/2] ?hci-platform: Add support for controllers with more then one reset line

[PATCH v3 0/2] ?hci-platform: Add support for controllers with more then one reset line

[Hans de Goede]

Hi All,

Here is a new version of my patch-set to support usb controllers which
have multiple resets. These patches apply on top of the related
reset-controller patches which have just been merged here:

git://git.pengutronix.de/git/pza/linux.git reset/next

Changes in v2:
-Switch to now shared reset_[de]assert functions

Changes in v3:
-Adjust for changes to shared-reset reset-controller functions

Regards,

Hans

[PATCH v3 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

From: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>

At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
reset lines, the controller will not initialize while the reset for
its companion is still asserted, which means we need to de-assert
2 resets for the controller to work.

Signed-off-by: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-Use the new reset_control_[de]assert_shared reset-controller functions
Changes in v3:
-Adjust for changes to shared-reset reset-controller functions
---
 Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-
 drivers/usb/host/ehci-platform.c                   | 41 ++++++++++++----------
 2 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
index a12d601..0701812 100644
--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
@@ -18,7 +18,7 @@ Optional properties:
  - clocks : a list of phandle + clock specifier pairs
  - phys : phandle + phy specifier pair
  - phy-names : "usb"
- - resets : phandle + reset specifier pair
+ - resets : a list of phandle + reset specifier pairs
 
 Example (Sequoia 440EPx):
     ehci@e0000300 {
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index bd7082f2..3f195ba 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -39,11 +39,12 @@
 
 #define DRIVER_DESC "EHCI generic platform driver"
 #define EHCI_MAX_CLKS 3
+#define EHCI_MAX_RESETS 2
 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
 
 struct ehci_platform_priv {
 	struct clk *clks[EHCI_MAX_CLKS];
-	struct reset_control *rst;
+	struct reset_control *resets[EHCI_MAX_RESETS];
 	struct phy **phys;
 	int num_phys;
 	bool reset_on_resume;
@@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv;
 	struct ehci_hcd *ehci;
-	int err, irq, phy_num, clk = 0;
+	int err, irq, phy_num, clk = 0, rst = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -232,18 +233,22 @@ static int ehci_platform_probe(struct platform_device *dev)
 				break;
 			}
 		}
-	}
 
-	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
-	if (IS_ERR(priv->rst)) {
-		err = PTR_ERR(priv->rst);
-		if (err == -EPROBE_DEFER)
-			goto err_put_clks;
-		priv->rst = NULL;
-	} else {
-		err = reset_control_deassert(priv->rst);
-		if (err)
-			goto err_put_clks;
+		for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
+			priv->resets[rst] =
+				devm_reset_control_get_shared_by_index(
+								&dev->dev, rst);
+			if (IS_ERR(priv->resets[rst])) {
+				err = PTR_ERR(priv->resets[rst]);
+				if (err == -EPROBE_DEFER)
+					goto err_reset;
+				priv->resets[rst] = NULL;
+				break;
+			}
+			err = reset_control_deassert(priv->resets[rst]);
+			if (err)
+				goto err_reset;
+		}
 	}
 
 	if (pdata->big_endian_desc)
@@ -300,8 +305,8 @@ err_power:
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	while (--rst >= 0)
+		reset_control_assert(priv->resets[rst]);
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -319,15 +324,15 @@ static int ehci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
-	int clk;
+	int clk, rst;
 
 	usb_remove_hcd(hcd);
 
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++)
+		reset_control_assert(priv->resets[rst]);
 
 	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);
-- 
2.7.1

[PATCH v3 2/2] ohci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
reset lines, the controller will not initialize while the reset for
its companion is still asserted, which means we need to de-assert
2 resets for the controller to work.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-New patch in v2 of this patch-set, to complement the identical patch for
 the ehci-platform code
Changes in v3:
-Adjust for changes to shared-reset reset-controller functions
---
 Documentation/devicetree/bindings/usb/usb-ohci.txt |  2 +-
 drivers/usb/host/ohci-platform.c                   | 43 ++++++++++++----------
 2 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
index 19233b7..9df4569 100644
--- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
@@ -14,7 +14,7 @@ Optional properties:
 - clocks : a list of phandle + clock specifier pairs
 - phys : phandle + phy specifier pair
 - phy-names : "usb"
-- resets : phandle + reset specifier pair
+- resets : a list of phandle + reset specifier pairs
 
 Example:
 
diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index c2669f18..5fa5813 100644
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -33,11 +33,12 @@
 
 #define DRIVER_DESC "OHCI generic platform driver"
 #define OHCI_MAX_CLKS 3
+#define OHCI_MAX_RESETS 2
 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 
 struct ohci_platform_priv {
 	struct clk *clks[OHCI_MAX_CLKS];
-	struct reset_control *rst;
+	struct reset_control *resets[OHCI_MAX_RESETS];
 	struct phy **phys;
 	int num_phys;
 };
@@ -117,7 +118,7 @@ static int ohci_platform_probe(struct platform_device *dev)
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv;
 	struct ohci_hcd *ohci;
-	int err, irq, phy_num, clk = 0;
+	int err, irq, phy_num, clk = 0, rst = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -195,19 +196,21 @@ static int ohci_platform_probe(struct platform_device *dev)
 				break;
 			}
 		}
-
-	}
-
-	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
-	if (IS_ERR(priv->rst)) {
-		err = PTR_ERR(priv->rst);
-		if (err == -EPROBE_DEFER)
-			goto err_put_clks;
-		priv->rst = NULL;
-	} else {
-		err = reset_control_deassert(priv->rst);
-		if (err)
-			goto err_put_clks;
+		for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
+			priv->resets[rst] =
+				devm_reset_control_get_shared_by_index(
+								&dev->dev, rst);
+			if (IS_ERR(priv->resets[rst])) {
+				err = PTR_ERR(priv->resets[rst]);
+				if (err == -EPROBE_DEFER)
+					goto err_reset;
+				priv->resets[rst] = NULL;
+				break;
+			}
+			err = reset_control_deassert(priv->resets[rst]);
+			if (err)
+				goto err_reset;
+		}
 	}
 
 	if (pdata->big_endian_desc)
@@ -265,8 +268,8 @@ err_power:
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	while (--rst >= 0)
+		reset_control_assert(priv->resets[rst]);
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -284,15 +287,15 @@ static int ohci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
-	int clk;
+	int clk, rst;
 
 	usb_remove_hcd(hcd);
 
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	for (rst = 0; rst < OHCI_MAX_RESETS && priv->resets[rst]; rst++)
+		reset_control_assert(priv->resets[rst]);
 
 	for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);
-- 
2.7.1

Re: [PATCH v3 2/2] ohci-platform: Add support for controllers with multiple reset lines

[kbuild test robot]

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Hi Hans,

[auto build test ERROR on robh/for-next]
[also build test ERROR on v4.5-rc5 next-20160223]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/ehci-platform-Add-support-for-controllers-with-multiple-reset-lines/20160224-191812
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux for-next
config: x86_64-randconfig-x004-201608 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   drivers/usb/host/ohci-platform.c: In function 'ohci_platform_probe':
>> drivers/usb/host/ohci-platform.c:201:5: error: implicit declaration of function 'devm_reset_control_get_shared_by_index' [-Werror=implicit-function-declaration]
        devm_reset_control_get_shared_by_index(
        ^
>> drivers/usb/host/ohci-platform.c:200:22: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       priv->resets[rst] =
                         ^
   cc1: some warnings being treated as errors

vim +/devm_reset_control_get_shared_by_index +201 drivers/usb/host/ohci-platform.c

   194						goto err_put_clks;
   195					priv->clks[clk] = NULL;
   196					break;
   197				}
   198			}
   199			for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
 > 200				priv->resets[rst] =
 > 201					devm_reset_control_get_shared_by_index(
   202									&dev->dev, rst);
   203				if (IS_ERR(priv->resets[rst])) {
   204					err = PTR_ERR(priv->resets[rst]);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v3 1/2] ehci-platform: Add support for controllers with multiple reset lines

[kbuild test robot]

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Hi Reinder,

[auto build test ERROR on robh/for-next]
[also build test ERROR on v4.5-rc5 next-20160223]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/ehci-platform-Add-support-for-controllers-with-multiple-reset-lines/20160224-191812
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux for-next
config: x86_64-randconfig-x004-201608 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   drivers/usb/host/ehci-platform.c: In function 'ehci_platform_probe':
>> drivers/usb/host/ehci-platform.c:239:5: error: implicit declaration of function 'devm_reset_control_get_shared_by_index' [-Werror=implicit-function-declaration]
        devm_reset_control_get_shared_by_index(
        ^
>> drivers/usb/host/ehci-platform.c:238:22: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       priv->resets[rst] =
                         ^
   cc1: some warnings being treated as errors

vim +/devm_reset_control_get_shared_by_index +239 drivers/usb/host/ehci-platform.c

   232					priv->clks[clk] = NULL;
   233					break;
   234				}
   235			}
   236	
   237			for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
 > 238				priv->resets[rst] =
 > 239					devm_reset_control_get_shared_by_index(
   240									&dev->dev, rst);
   241				if (IS_ERR(priv->resets[rst])) {
   242					err = PTR_ERR(priv->resets[rst]);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v3 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Roger Quadros]

Hi,

On 24/02/16 13:15, Hans de Goede wrote:
> From: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
> 
> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> reset lines, the controller will not initialize while the reset for
> its companion is still asserted, which means we need to de-assert
> 2 resets for the controller to work.
> 
> Signed-off-by: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> Changes in v2:
> -Use the new reset_control_[de]assert_shared reset-controller functions
> Changes in v3:
> -Adjust for changes to shared-reset reset-controller functions
> ---
>  Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-
>  drivers/usb/host/ehci-platform.c                   | 41 ++++++++++++----------
>  2 files changed, 24 insertions(+), 19 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> index a12d601..0701812 100644
> --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> @@ -18,7 +18,7 @@ Optional properties:
>   - clocks : a list of phandle + clock specifier pairs
>   - phys : phandle + phy specifier pair
>   - phy-names : "usb"
> - - resets : phandle + reset specifier pair
> + - resets : a list of phandle + reset specifier pairs
>  
>  Example (Sequoia 440EPx):
>      ehci@e0000300 {
> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
> index bd7082f2..3f195ba 100644
> --- a/drivers/usb/host/ehci-platform.c
> +++ b/drivers/usb/host/ehci-platform.c
> @@ -39,11 +39,12 @@
>  
>  #define DRIVER_DESC "EHCI generic platform driver"
>  #define EHCI_MAX_CLKS 3
> +#define EHCI_MAX_RESETS 2
>  #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
>  
>  struct ehci_platform_priv {
>  	struct clk *clks[EHCI_MAX_CLKS];
> -	struct reset_control *rst;
> +	struct reset_control *resets[EHCI_MAX_RESETS];
>  	struct phy **phys;
>  	int num_phys;
>  	bool reset_on_resume;
> @@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
>  	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
>  	struct ehci_platform_priv *priv;
>  	struct ehci_hcd *ehci;
> -	int err, irq, phy_num, clk = 0;
> +	int err, irq, phy_num, clk = 0, rst = 0;
>  
>  	if (usb_disabled())
>  		return -ENODEV;
> @@ -232,18 +233,22 @@ static int ehci_platform_probe(struct platform_device *dev)
>  				break;
>  			}
>  		}
> -	}
>  
> -	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
> -	if (IS_ERR(priv->rst)) {
> -		err = PTR_ERR(priv->rst);
> -		if (err == -EPROBE_DEFER)
> -			goto err_put_clks;
> -		priv->rst = NULL;
> -	} else {
> -		err = reset_control_deassert(priv->rst);
> -		if (err)
> -			goto err_put_clks;
> +		for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
> +			priv->resets[rst] =
> +				devm_reset_control_get_shared_by_index(
> +								&dev->dev, rst);
> +			if (IS_ERR(priv->resets[rst])) {
> +				err = PTR_ERR(priv->resets[rst]);
> +				if (err == -EPROBE_DEFER)
> +					goto err_reset;
> +				priv->resets[rst] = NULL;
> +				break;
> +			}
> +			err = reset_control_deassert(priv->resets[rst]);
> +			if (err)
> +				goto err_reset;
> +		}

Why is this code within "if (dev->of.node)" ?
Previous code looked like it worked for non-DT boots as well.

>  	}
>  
>  	if (pdata->big_endian_desc)
> @@ -300,8 +305,8 @@ err_power:
>  	if (pdata->power_off)
>  		pdata->power_off(dev);
>  err_reset:
> -	if (priv->rst)
> -		reset_control_assert(priv->rst);
> +	while (--rst >= 0)
> +		reset_control_assert(priv->resets[rst]);
>  err_put_clks:
>  	while (--clk >= 0)
>  		clk_put(priv->clks[clk]);
> @@ -319,15 +324,15 @@ static int ehci_platform_remove(struct platform_device *dev)
>  	struct usb_hcd *hcd = platform_get_drvdata(dev);
>  	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
>  	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
> -	int clk;
> +	int clk, rst;
>  
>  	usb_remove_hcd(hcd);
>  
>  	if (pdata->power_off)
>  		pdata->power_off(dev);
>  
> -	if (priv->rst)
> -		reset_control_assert(priv->rst);
> +	for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++)
> +		reset_control_assert(priv->resets[rst]);
>  
>  	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
>  		clk_put(priv->clks[clk]);
> 

cheers,
-roger

Re: [PATCH v3 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

Hi,

On 24-02-16 12:37, Roger Quadros wrote:
> Hi,
>
> On 24/02/16 13:15, Hans de Goede wrote:
>> From: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
>>
>> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
>> reset lines, the controller will not initialize while the reset for
>> its companion is still asserted, which means we need to de-assert
>> 2 resets for the controller to work.
>>
>> Signed-off-by: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>> Changes in v2:
>> -Use the new reset_control_[de]assert_shared reset-controller functions
>> Changes in v3:
>> -Adjust for changes to shared-reset reset-controller functions
>> ---
>>   Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-
>>   drivers/usb/host/ehci-platform.c                   | 41 ++++++++++++----------
>>   2 files changed, 24 insertions(+), 19 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
>> index a12d601..0701812 100644
>> --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
>> +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
>> @@ -18,7 +18,7 @@ Optional properties:
>>    - clocks : a list of phandle + clock specifier pairs
>>    - phys : phandle + phy specifier pair
>>    - phy-names : "usb"
>> - - resets : phandle + reset specifier pair
>> + - resets : a list of phandle + reset specifier pairs
>>
>>   Example (Sequoia 440EPx):
>>       ehci@e0000300 {
>> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
>> index bd7082f2..3f195ba 100644
>> --- a/drivers/usb/host/ehci-platform.c
>> +++ b/drivers/usb/host/ehci-platform.c
>> @@ -39,11 +39,12 @@
>>
>>   #define DRIVER_DESC "EHCI generic platform driver"
>>   #define EHCI_MAX_CLKS 3
>> +#define EHCI_MAX_RESETS 2
>>   #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
>>
>>   struct ehci_platform_priv {
>>   	struct clk *clks[EHCI_MAX_CLKS];
>> -	struct reset_control *rst;
>> +	struct reset_control *resets[EHCI_MAX_RESETS];
>>   	struct phy **phys;
>>   	int num_phys;
>>   	bool reset_on_resume;
>> @@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
>>   	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
>>   	struct ehci_platform_priv *priv;
>>   	struct ehci_hcd *ehci;
>> -	int err, irq, phy_num, clk = 0;
>> +	int err, irq, phy_num, clk = 0, rst = 0;
>>
>>   	if (usb_disabled())
>>   		return -ENODEV;
>> @@ -232,18 +233,22 @@ static int ehci_platform_probe(struct platform_device *dev)
>>   				break;
>>   			}
>>   		}
>> -	}
>>
>> -	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
>> -	if (IS_ERR(priv->rst)) {
>> -		err = PTR_ERR(priv->rst);
>> -		if (err == -EPROBE_DEFER)
>> -			goto err_put_clks;
>> -		priv->rst = NULL;
>> -	} else {
>> -		err = reset_control_deassert(priv->rst);
>> -		if (err)
>> -			goto err_put_clks;
>> +		for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
>> +			priv->resets[rst] =
>> +				devm_reset_control_get_shared_by_index(
>> +								&dev->dev, rst);
>> +			if (IS_ERR(priv->resets[rst])) {
>> +				err = PTR_ERR(priv->resets[rst]);
>> +				if (err == -EPROBE_DEFER)
>> +					goto err_reset;
>> +				priv->resets[rst] = NULL;
>> +				break;
>> +			}
>> +			err = reset_control_deassert(priv->resets[rst]);
>> +			if (err)
>> +				goto err_reset;
>> +		}
>
> Why is this code within "if (dev->of.node)" ?
> Previous code looked like it worked for non-DT boots as well.

Because devm_reset_control_get_shared_by_index() only works for DT platforms
(it is safe to call on non DT platforms, it will just always return -EINVAL
there) and the old reset paths were ever only used / only ever worked with
DT too.

Regards,

Hans

Re: [PATCH v3 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Alan Stern]

On Wed, 24 Feb 2016, Roger Quadros wrote:

> Hi,
> 
> On 24/02/16 13:15, Hans de Goede wrote:
> > From: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
> > 
> > At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> > reset lines, the controller will not initialize while the reset for
> > its companion is still asserted, which means we need to de-assert
> > 2 resets for the controller to work.
> > 
> > Signed-off-by: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
> > Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

> > -	} else {
> > -		err = reset_control_deassert(priv->rst);
> > -		if (err)
> > -			goto err_put_clks;
> > +		for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
> > +			priv->resets[rst] =
> > +				devm_reset_control_get_shared_by_index(
> > +								&dev->dev, rst);

Ugly continuation line.  The convention in these files is to indent 
continuation lines by two tab stops beyond the original source line.
Same comment applies to the 2/2 patch.

Once that is changed, you can add:

Acked-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>

to both.

Alan Stern

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