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

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Date:   Mon, 12 Jun 2023 16:06:32 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
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 11:23:44AM +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.

> 
> 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
>