netdev - [RFC v1 net-next 1/7] phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration

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Message-Id: <20230216075321.2898003-2-colin.foster@in-advantage.com>
Date:   Wed, 15 Feb 2023 23:53:15 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-phy@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee@...nel.org>
Subject: [RFC v1 net-next 1/7] phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration

The phy-ocelot-serdes module has exclusively been used in a syscon setup,
from an internal CPU. The addition of external control of ocelot switches
via an existing MFD implementation means that syscon is no longer the only
interface that phy-ocelot-serdes will see.

In the MFD configuration, an IORESOURCE_REG resource will exist for the
device. Utilize this resource to be able to function in both syscon and
non-syscon configurations.

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 drivers/phy/mscc/phy-ocelot-serdes.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/phy/mscc/phy-ocelot-serdes.c b/drivers/phy/mscc/phy-ocelot-serdes.c
index 76f596365176..d9443e865a78 100644
--- a/drivers/phy/mscc/phy-ocelot-serdes.c
+++ b/drivers/phy/mscc/phy-ocelot-serdes.c
@@ -494,6 +494,7 @@ static int serdes_probe(struct platform_device *pdev)
 {
 	struct phy_provider *provider;
 	struct serdes_ctrl *ctrl;
+	struct resource *res;
 	unsigned int i;
 	int ret;
 
@@ -503,6 +504,14 @@ static int serdes_probe(struct platform_device *pdev)
 
 	ctrl->dev = &pdev->dev;
 	ctrl->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
+	if (IS_ERR(ctrl->regs)) {
+		/* Fall back to using IORESOURCE_REG, if possible */
+		res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+		if (res)
+			ctrl->regs = dev_get_regmap(ctrl->dev->parent,
+						    res->name);
+	}
+
 	if (IS_ERR(ctrl->regs))
 		return PTR_ERR(ctrl->regs);
 
-- 
2.25.1