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

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Message-ID: <Y1ZQ3NyR7Suxdltu@kuha.fi.intel.com>
Date:   Mon, 24 Oct 2022 11:46:20 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Wayne Chang <waynec@...dia.com>, 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

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*.
> 
> 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