linux-kernel - Re: [PATCH v2 5/8] phy: phy-snps-eusb2: make repeater optional

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Message-ID: <8e8bbcde-8ed4-4239-ad96-6cffd8b9d65c@gmail.com>
Date: Wed, 19 Mar 2025 13:39:00 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Abel Vesa <abel.vesa@...aro.org>,
 linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/8] phy: phy-snps-eusb2: make repeater optional

On 3/19/25 13:08, Dmitry Baryshkov wrote:
> On Sun, Feb 23, 2025 at 02:22:24PM +0200, Ivaylo Ivanov wrote:
>> Some platforms initialize their eUSB2 to USB repeater in the previous
>> stage bootloader and leave it in a working state for linux. Make the
>> repeater optional in order to allow for reusing that state until
>> proper repeater drivers are introduced.
> Generally "works as it is setup by the bootloader" is a very invalid
> justification. Please don't do that. We should not be depending on the
> way the bootlader sets up the devices, unless that _really_ makes sense.

It does, doesn't it? We still don't even have i2c up on Exynos2200, so bringing up
the repeater before this patchset gets merged is a no-go. Either way, we should
follow what bindings say. I will change the commit description a bit.

Best regards,
Ivaylo

>
>> Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
>> ---
>>  drivers/phy/phy-snps-eusb2.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/phy/phy-snps-eusb2.c b/drivers/phy/phy-snps-eusb2.c
>> index 4e5914a76..dcc69c00a 100644
>> --- a/drivers/phy/phy-snps-eusb2.c
>> +++ b/drivers/phy/phy-snps-eusb2.c
>> @@ -461,7 +461,7 @@ static int snps_eusb2_hsphy_probe(struct platform_device *pdev)
>>  		return dev_err_probe(dev, ret,
>>  				     "failed to get regulator supplies\n");
>>  
>> -	phy->repeater = devm_of_phy_get_by_index(dev, np, 0);
>> +	phy->repeater = devm_of_phy_optional_get(dev, np, 0);
>>  	if (IS_ERR(phy->repeater))
>>  		return dev_err_probe(dev, PTR_ERR(phy->repeater),
>>  				     "failed to get repeater\n");
>> -- 
>> 2.43.0
>>