linux-kernel - Re: [PATCH v2 3/7] phy: qcom: qmp-combo: introduce QPHY

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Date: Mon, 27 May 2024 11:59:31 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
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>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] phy: qcom: qmp-combo: introduce QPHY_MODE

On Mon, May 27, 2024 at 10:48:12AM +0200, Neil Armstrong wrote:
> On 27/05/2024 10:46, Dmitry Baryshkov wrote:
> > On Mon, May 27, 2024 at 10:42:35AM +0200, Neil Armstrong wrote:
> > > Introduce an enum for the QMP Combo PHY modes, use it in the
> > > QMP commmon phy init function and default to COMBO mode.
> > > 
> > > Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> > > ---
> > >   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 41 +++++++++++++++++++++++++++----
> > >   1 file changed, 36 insertions(+), 5 deletions(-)
> > > 

[trimmed]

> > > @@ -3603,6 +3631,9 @@ static int qmp_combo_probe(struct platform_device *pdev)
> > >   	if (ret)
> > >   		goto err_node_put;
> > > +	/* Set PHY_MODE as combo by default */
> > > +	qmp->init_mode = QPHY_MODE_COMBO;
> > > +
> > 
> > I see that COMBO mode is backwards compatible with existing code. But
> > shouldn't the USB-only be a default mode?
> 
> No because it would break existing platforms without "mode-switch" in DT.


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


> 
> Neil
> 
> > 
> > >   	qmp->usb_phy = devm_phy_create(dev, usb_np, &qmp_combo_usb_phy_ops);
> > >   	if (IS_ERR(qmp->usb_phy)) {
> > >   		ret = PTR_ERR(qmp->usb_phy);
> > > 
> > > -- 
> > > 2.34.1
> > > 
> > 
> 

-- 
With best wishes
Dmitry