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From:   Michael Walle <michael@walle.cc>
To:     Linus Walleij <linus.walleij@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Lars Povlsen <lars.povlsen@microchip.com>
Cc:     linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Horatiu Vultur <horatiu.vultur@microchip.com>,
        Michael Walle <michael@walle.cc>
Subject: [PATCH RFC v1 2/2] pinctrl: ocelot: add optional shared reset
Date:   Sun, 13 Mar 2022 16:46:40 +0100
Message-Id: <20220313154640.63813-3-michael@walle.cc>
In-Reply-To: <20220313154640.63813-1-michael@walle.cc>
References: <20220313154640.63813-1-michael@walle.cc>
MIME-Version: 1.0
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Precedence: bulk

On the LAN9668 there is a shared reset line which affects GPIO, SGPIO
and the switch core. Add support for this shared reset line.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/pinctrl/pinctrl-ocelot.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index 35b213de1af8..d78716533393 100644
--- a/drivers/pinctrl/pinctrl-ocelot.c
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -19,6 +19,7 @@
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 
 #include "core.h"
@@ -1906,6 +1907,7 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct ocelot_pinctrl *info;
+	struct reset_control *reset;
 	struct regmap *pincfg;
 	void __iomem *base;
 	int ret;
@@ -1921,6 +1923,13 @@ static int ocelot_pinctrl_probe(struct platform_device *pdev)
 
 	info->desc = (struct pinctrl_desc *)device_get_match_data(dev);
 
+	reset = devm_reset_control_get_optional_shared(dev, "switch");
+	if (IS_ERR(reset)) {
+		dev_err(dev, "Failed to get reset\n");
+		return PTR_ERR(reset);
+	}
+	reset_control_reset(reset);
+
 	base = devm_ioremap_resource(dev,
 			platform_get_resource(pdev, IORESOURCE_MEM, 0));
 	if (IS_ERR(base))
-- 
2.30.2