linux-kernel - Re: [PATCH 2/5] reset: Add acquired flag to of_reset_control_array

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Message-ID: <87tvfyujgp.fsf@linux.intel.com>
Date:   Wed, 20 Mar 2019 08:51:34 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/5] reset: Add acquired flag to of_reset_control_array_get()

Philipp Zabel <p.zabel@...gutronix.de> writes:

> On Thu, 2019-02-21 at 16:25 +0100, Thierry Reding wrote:
>> From: Thierry Reding <treding@...dia.com>
>> 
>> In order to be able to request an array of reset controls in acquired or
>> released mode, add the acquired flag to of_reset_control_array_get() and
>> pass the flag to subsequent calls of __of_reset_control_get().
>> 
>> Signed-off-by: Thierry Reding <treding@...dia.com>
>> ---
>>  drivers/reset/core.c              |  9 ++++++---
>>  drivers/usb/dwc3/dwc3-of-simple.c |  3 ++-
>>  include/linux/reset.h             | 14 ++++++++------
>>  3 files changed, 16 insertions(+), 10 deletions(-)
>> 
>> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
>> index 1e8a42b16f23..f94da91c22af 100644
>> --- a/drivers/reset/core.c
>> +++ b/drivers/reset/core.c
>> @@ -830,12 +830,15 @@ static int of_reset_control_get_count(struct device_node *node)
>>   * @np: device node for the device that requests the reset controls array
>>   * @shared: whether reset controls are shared or not
>>   * @optional: whether it is optional to get the reset controls
>> + * @acquired: only one reset control may be acquired for a given controller
>> + *            and ID
>>   *
>>   * Returns pointer to allocated reset_control_array on success or
>>   * error on failure
>>   */
>>  struct reset_control *
>> -of_reset_control_array_get(struct device_node *np, bool shared, bool optional)
>> +of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
>> +			   bool acquired)
>>  {
>>  	struct reset_control_array *resets;
>>  	struct reset_control *rstc;
>> @@ -851,7 +854,7 @@ of_reset_control_array_get(struct device_node *np, bool shared, bool optional)
>>  
>>  	for (i = 0; i < num; i++) {
>>  		rstc = __of_reset_control_get(np, NULL, i, shared, optional,
>> -					      true);
>> +					      acquired);
>>  		if (IS_ERR(rstc))
>>  			goto err_rst;
>>  		resets->rstc[i] = rstc;
>> @@ -898,7 +901,7 @@ devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
>>  	if (!devres)
>>  		return ERR_PTR(-ENOMEM);
>>  
>> -	rstc = of_reset_control_array_get(dev->of_node, shared, optional);
>> +	rstc = of_reset_control_array_get(dev->of_node, shared, optional, true);
>>  	if (IS_ERR(rstc)) {
>>  		devres_free(devres);
>>  		return rstc;
>> diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
>> index 4c2771c5e727..67ce2037472d 100644
>> --- a/drivers/usb/dwc3/dwc3-of-simple.c
>> +++ b/drivers/usb/dwc3/dwc3-of-simple.c
>> @@ -107,7 +107,8 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
>>  		simple->pulse_resets = true;
>>  	}
>>  
>> -	simple->resets = of_reset_control_array_get(np, shared_resets, true);
>> +	simple->resets = of_reset_control_array_get(np, shared_resets, true,
>> +						    true);
>
> Felipe, could I get your acked-by to merge this through the reset tree?
>
> dwc3-of-simple is a bit of a special case because it calls
> of_reset_control_array_get directly instead of through the
> of_reset_control_array_get_shared/exclusive wrappers.

Sure thing:

Acked-by: Felipe Balbi <felipe.balbi@...ux.intel.com>

-- 
balbi

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