linux-kernel - Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Date: Wed, 24 Apr 2024 21:36:34 +0800
From: quic_zijuhu <quic_zijuhu@...cinc.com>
To: Wren Turkal <wt@...guintechs.org>,
        Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>
CC: Bartosz Golaszewski <brgl@...ev.pl>,
        Marcel Holtmann
	<marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL
 returned by gpiod_get_optional()

On 4/24/2024 9:31 PM, Wren Turkal wrote:
> On 4/24/24 6:22 AM, quic_zijuhu wrote:
>> On 4/24/2024 9:18 PM, Bartosz Golaszewski wrote:
>>> On Wed, 24 Apr 2024 at 15:10, Wren Turkal <wt@...guintechs.org> wrote:
>>>>
>>>> On 4/24/24 5:29 AM, Bartosz Golaszewski wrote:
>>>>> From: Bartosz Golaszewski<bartosz.golaszewski@...aro.org>
>>>>>
>>>>> Any return value from gpiod_get_optional() other than a pointer to a
>>>>> GPIO descriptor or a NULL-pointer is an error and the driver should
>>>>> abort probing. That being said: commit 56d074d26c58 ("Bluetooth:
>>>>> hci_qca:
>>>>> don't use IS_ERR_OR_NULL() with gpiod_get_optional()") no longer sets
>>>>> power_ctrl_enabled on NULL-pointer returned by
>>>>> devm_gpiod_get_optional(). Restore this behavior but bail-out on
>>>>> errors.
>>>>> While at it: also bail-out on error returned when trying to get the
>>>>> "swctrl" GPIO.
>>>>>
>>>>> Reported-by: Wren Turkal<wt@...guintechs.org>
>>>>> Reported-by: Zijun Hu<quic_zijuhu@...cinc.com>
>>>>> Closes:https://lore.kernel.org/linux-bluetooth/1713449192-25926-2-git-send-email-quic_zijuhu@quicinc.com/
>>>>> Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use
>>>>> IS_ERR_OR_NULL() with gpiod_get_optional()")
>>>>> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski@...aro.org>
>>>>> Signed-off-by: Bartosz Golaszewski<bartosz.golaszewski@...aro.org>
>>>>
>>>> Tested-by: "Wren Turkal" <wt@...guintechs.org>
>>>>
>>>>
>>>> Like this?
>>>
>>> Yes, awesome, thanks.
>>>
>>> This is how reviewing works too in the kernel, look at what Krzysztof
>>> did under v1, he just wrote:
>>>
>>> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski@...aro.org>
>>>
>> v1 have obvious something wrong as i pointed and verified.
>> so i think it is not suitable to attach v1's review-by tag to v2 anyway.
> 
> @Zijun, your concern is that current DTs may not define the gpio and
> this will cause the bluetooth not to work?
> 
> Would that not more appropriately be fixed by machine-specific fixups
> for the DT?
> 
for lunched production, it is difficult or not possible to change such
config.

>>
>>> And mailing list tools will pick it up.
>>>
>>> Bartosz
>>
>