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

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Message-ID: <87czaheiag.fsf@balbi.sh>
Date:   Mon, 24 Oct 2022 11:29:27 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Wayne Chang <waynec@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, treding@...dia.com,
        jonathanh@...dia.com, thierry.reding@...il.com, ajayg@...dia.com,
        kishon@...com, vkoul@...nel.org, p.zabel@...gutronix.de,
        mathias.nyman@...el.com, jckuo@...dia.com,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, singhanc@...dia.com,
        linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 06/11] usb: typec: ucsi_ccg: Replace ccgx to well-known
 regex

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*.

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?

-- 
balbi

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