linux-kernel - Re: [PATCH 15/26] net: stmmac: dwmac-qcom-ethqos: add support for the optional phy-supply

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Message-ID: <CAMRc=Mc0hJXSazCX-5DQL7LEZ7WkhmZURxK9Kiyf_bR2d+_S3g@mail.gmail.com>
Date:   Tue, 13 Jun 2023 11:02:17 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andrew Halaney <ahalaney@...hat.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 15/26] net: stmmac: dwmac-qcom-ethqos: add support for the
 optional phy-supply

On Mon, Jun 12, 2023 at 11:06 PM Andrew Halaney <ahalaney@...hat.com> wrote:
>
> On Mon, Jun 12, 2023 at 11:23:44AM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > On sa8775p-ride we need to enable the power supply for the external PHY.
>
> Is this for the external phy? It doesn't seem like it from the board
> schematic I have... the regulator never makes it out of the black box that
> is the SIP/SOM if I'm reading right.
>
> My (poor) understanding was this was for the serdes phy that's doing the
> conversion to SGMII before hitting the board... good chance I'm wrong
> though.
>

No, you're right. In which case I think the regulator calls should be
moved into the serdes driver instead as phy-supply is defined as the
supply of the external PHY in stmmac bindings.

Bart

> >
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > ---
> >  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> > index 2f6b9b419601..21f329d2f7eb 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> > @@ -8,6 +8,7 @@
> >  #include <linux/phy.h>
> >  #include <linux/phy/phy.h>
> >  #include <linux/property.h>
> > +#include <linux/regulator/consumer.h>
> >
> >  #include "stmmac.h"
> >  #include "stmmac_platform.h"
> > @@ -692,6 +693,10 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
> >       if (ret)
> >               goto out_config_dt;
> >
> > +     ret = devm_regulator_get_enable_optional(dev, "phy");
> > +     if (ret < 0 && ret != -ENODEV)
> > +             goto out_config_dt;
> > +
> >       ethqos->serdes_phy = devm_phy_optional_get(dev, "serdes");
> >       if (IS_ERR(ethqos->serdes_phy)) {
> >               ret = PTR_ERR(ethqos->serdes_phy);
> > --
> > 2.39.2
> >
>