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Date: Tue, 30 Aug 2022 20:42:36 +0300
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Oleksij Rempel <o.rempel@...gutronix.de>,
Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Russell King <linux@...linux.org.uk>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Jonathan Corbet <corbet@....net>
Cc: kernel@...gutronix.de, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-doc@...r.kernel.org, David Jander <david@...tonic.nl>,
Luka Perkov <luka.perkov@...tura.hr>,
Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v4 7/7] net: pse-pd: add regulator based PSE
driver
On 28/08/2022 09:30, Oleksij Rempel wrote:
> Add generic, regulator based PSE driver to support simple Power Sourcing
> Equipment without automatic classification support.
>
> This driver was tested on 10Bast-T1L switch with regulator based PoDL PSE.
>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
> changes v4:
> - rename to pse_regulator
> changes v2:
> - add regulator_enable test to the probe
> - migrate to the new PSE ethtool API
> ---
> drivers/net/pse-pd/Kconfig | 11 +++
> drivers/net/pse-pd/Makefile | 2 +
> drivers/net/pse-pd/pse_regulator.c | 148 +++++++++++++++++++++++++++++
> 3 files changed, 161 insertions(+)
> create mode 100644 drivers/net/pse-pd/pse_regulator.c
>
> diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig
> index 49c7f0bcff526..73d163704068a 100644
> --- a/drivers/net/pse-pd/Kconfig
> +++ b/drivers/net/pse-pd/Kconfig
> @@ -9,3 +9,14 @@ menuconfig PSE_CONTROLLER
> Generic Power Sourcing Equipment Controller support.
>
> If unsure, say no.
> +
> +if PSE_CONTROLLER
> +
> +config PSE_REGULATOR
> + tristate "Regulator based PSE controller"
> + help
> + This module provides support for simple regulator based Ethernet Power
> + Sourcing Equipment without automatic classification support. For
> + example for basic implementation of PoDL (802.3bu) specification.
> +
> +endif
> diff --git a/drivers/net/pse-pd/Makefile b/drivers/net/pse-pd/Makefile
> index cfa780c7801dd..1b8aa4c70f0b9 100644
> --- a/drivers/net/pse-pd/Makefile
> +++ b/drivers/net/pse-pd/Makefile
> @@ -2,3 +2,5 @@
> # Makefile for Linux PSE drivers
>
> obj-$(CONFIG_PSE_CONTROLLER) += pse_core.o
> +
> +obj-$(CONFIG_PSE_REGULATOR) += pse_regulator.o
> diff --git a/drivers/net/pse-pd/pse_regulator.c b/drivers/net/pse-pd/pse_regulator.c
> new file mode 100644
> index 0000000000000..46ea5b8215dcd
> --- /dev/null
> +++ b/drivers/net/pse-pd/pse_regulator.c
> @@ -0,0 +1,148 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Driver for the regulator based Ethernet Power Sourcing Equipment, without
> +// auto classification support.
> +//
> +// Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@...gutronix.de>
> +//
> +
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pse-pd/pse.h>
> +#include <linux/regulator/consumer.h>
> +
> +struct pse_reg_priv {
> + struct pse_controller_dev pcdev;
> + struct regulator *ps; /*power source */
> + enum ethtool_podl_pse_admin_state admin_state;
> +};
> +
> +static struct pse_reg_priv *to_pse_reg(struct pse_controller_dev *pcdev)
> +{
> + return container_of(pcdev, struct pse_reg_priv, pcdev);
> +}
> +
> +static int
> +pse_reg_ethtool_set_config(struct pse_controller_dev *pcdev, unsigned long id,
> + struct netlink_ext_ack *extack,
> + const struct pse_control_config *config)
> +{
> + struct pse_reg_priv *priv = to_pse_reg(pcdev);
> + int ret;
> +
> + if (priv->admin_state == config->admin_cotrol)
> + return 0;
> +
> + switch (config->admin_cotrol) {
> + case ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED:
> + ret = regulator_enable(priv->ps);
> + break;
> + case ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED:
> + ret = regulator_disable(priv->ps);
> + break;
> + default:
> + dev_err(pcdev->dev, "Unknown admin state %i\n",
> + config->admin_cotrol);
> + ret = -ENOTSUPP;
> + }
> +
> + if (ret)
> + return ret;
> +
> + priv->admin_state = config->admin_cotrol;
> +
> + return 0;
> +}
> +
> +static int
> +pse_reg_ethtool_get_status(struct pse_controller_dev *pcdev, unsigned long id,
> + struct netlink_ext_ack *extack,
> + struct pse_control_status *status)
> +{
> + struct pse_reg_priv *priv = to_pse_reg(pcdev);
> + int ret;
> +
> + ret = regulator_is_enabled(priv->ps);
> + if (ret < 0)
> + return ret;
> +
> + if (!ret)
> + status->podl_pw_status = ETHTOOL_PODL_PSE_PW_D_STATUS_DISABLED;
> + else
> + status->podl_pw_status =
> + ETHTOOL_PODL_PSE_PW_D_STATUS_DELIVERING;
> +
> + status->podl_admin_state = priv->admin_state;
> +
> + return 0;
> +}
> +
> +static const struct pse_controller_ops pse_reg_ops = {
> + .ethtool_get_status = pse_reg_ethtool_get_status,
> + .ethtool_set_config = pse_reg_ethtool_set_config,
> +};
> +
> +static int
> +pse_reg_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct pse_reg_priv *priv;
> + int ret;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + if (!pdev->dev.of_node)
> + return -ENOENT;
> +
> + priv->ps = devm_regulator_get_exclusive(dev, "pse");
> + if (IS_ERR(priv->ps)) {
> + dev_err(dev, "failed to get PSE regulator (%pe)\n", priv->ps);
return dev_err_probe().
> + return PTR_ERR(priv->ps);
> + }
> +
> + platform_set_drvdata(pdev, priv);
> +
> + ret = regulator_is_enabled(priv->ps);
> + if (ret < 0)
> + return ret;
> +
> + if (ret)
> + priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_ENABLED;
> + else
> + priv->admin_state = ETHTOOL_PODL_PSE_ADMIN_STATE_DISABLED;
> +
> + priv->pcdev.owner = THIS_MODULE;
> + priv->pcdev.ops = &pse_reg_ops;
> + priv->pcdev.dev = dev;
> + ret = devm_pse_controller_register(dev, &priv->pcdev);
> + if (ret) {
> + dev_err(dev, "failed to register PSE controller (%pe)\n",
> + ERR_PTR(ret));
return dev_err_probe()
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id pse_reg_of_match[] = {
> + { .compatible = "podl-pse-regulator", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, pse_reg_of_match);
> +
> +static struct platform_driver pse_reg_driver = {
> + .probe = pse_reg_probe,
> + .driver = {
> + .name = "PSE regulator",
> + .of_match_table = of_match_ptr(pse_reg_of_match),
You need to compile test it... No of_match_ptr() or add maybe_unused to
the table.
Best regards,
Krzysztof
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