linux-kernel - [RFC v7 net-next 07/13] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration

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Message-Id: <20220307021208.2406741-8-colin.foster@in-advantage.com>
Date:   Sun,  6 Mar 2022 18:12:02 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-phy@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Marc Zyngier <maz@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Angela Czubak <acz@...ihalf.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...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.jones@...aro.org>, katie.morris@...advantage.com
Subject: [RFC v7 net-next 07/13] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration

There are a few Ocelot chips that can contain SGPIO logic, but can be
controlled externally. Specifically the VSC7511, 7512, 7513, and 7514. In
the externally controlled configurations these registers are not
memory-mapped.

Add support for these non-memory-mapped configurations.

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 drivers/pinctrl/pinctrl-microchip-sgpio.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
index e8e47a6808e6..a91272936c8f 100644
--- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
+++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
@@ -19,6 +19,7 @@
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <soc/mscc/ocelot.h>
 
 #include "core.h"
 #include "pinconf.h"
@@ -819,6 +820,7 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
 	struct fwnode_handle *fwnode;
 	struct reset_control *reset;
 	struct sgpio_priv *priv;
+	struct resource *res;
 	struct clk *clk;
 	u32 __iomem *regs;
 	u32 val;
@@ -851,11 +853,23 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(regs))
-		return PTR_ERR(regs);
+	regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+	if (IS_ERR(regs)) {
+		/*
+		 * Fall back to using IORESOURCE_REG, which is possible in an
+		 * MFD configuration
+		 */
+		res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+		if (!res) {
+			dev_err(dev, "Failed to get resource\n");
+			return -ENODEV;
+		}
+
+		priv->regs = ocelot_get_regmap_from_resource(dev, res);
+	} else {
+		priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
+	}
 
-	priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
 	if (IS_ERR(priv->regs))
 		return PTR_ERR(priv->regs);
 
-- 
2.25.1