linux-kernel - Re: [PATCH 06/11] usb: typec: ucsi_ccg: Replace ccgx to well-known regex

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Message-ID: <0e00952e-fa54-bbca-7608-09fd08356513@nvidia.com>
Date:   Tue, 25 Oct 2022 07:26:45 +0000
From:   Wayne Chang <waynec@...dia.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Felipe Balbi <balbi@...nel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Ajay Gupta <ajayg@...dia.com>, "kishon@...com" <kishon@...com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        Jui Chang Kuo <jckuo@...dia.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sing-Han Chen <singhanc@...dia.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 06/11] usb: typec: ucsi_ccg: Replace ccgx to well-known
 regex

Thanks for the review.

On 10/24/22 16:46, Heikki Krogerus wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Mon, Oct 24, 2022 at 11:29:27AM +0300, Felipe Balbi wrote:
>> Heikki Krogerus <heikki.krogerus@...ux.intel.com> writes:
>>
>>> On Mon, Oct 24, 2022 at 03:41:23PM +0800, Wayne Chang wrote:
>>>> ccgx is refer to the cypress cypd4226 typec controller.
>>>> Replace ccgx to well-known regex "cypress".
>>>>
>>>> Signed-off-by: Wayne Chang <waynec@...dia.com>
>>>> ---
>>>>   drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
>>>> index 139707a2f3d6..5d3099e6eb77 100644
>>>> --- a/drivers/usb/typec/ucsi/ucsi_ccg.c
>>>> +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
>>>> @@ -1358,7 +1358,7 @@ static int ucsi_ccg_probe(struct i2c_client *client,
>>>>     INIT_WORK(&uc->pm_work, ccg_pm_workaround_work);
>>>>
>>>>     /* Only fail FW flashing when FW build information is not provided */
>>>> -  status = device_property_read_u16(dev, "ccgx,firmware-build",
>>>> +  status = device_property_read_u16(dev, "cypress,firmware-build",
>>>>                                       &uc->fw_build);
>>>>     if (status)
>>>>             dev_err(uc->dev, "failed to get FW build information\n");
>>>
>>> This will break bisectability. You need to first add that
>>> "cyppress,firmware-build" identifier without removing the old
>>> "ccgx,firmware-build" identifier, and then introduce a separate
>>> clean-up patch where you remove it when it's safe to remove:
>>>
>>> 1. Add new - This patch.
>>> 2. Modify users - PATCH 7/11.
>>> 3. Remove old - *missing*.
>>

thanks for the guidance.
will update the changes in the next patchset.

thanks,
Wayne.

>> will it ever be safe to remove? What about potential products in the
>> market with little to no upgrade path? There are likely to be products
>> with a DTB that will never be updated, no?
> 
> Not the case here. OF support is only just added to this driver in
> this series. That old identifier has been used as a build-in property
> only.
> 
> thanks,
> 
> --
> heikki
>