linux-kernel - [PATCH v3 2/2] pinctrl: ocelot: add optional shared reset

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Message-Id: <20220420191926.3411830-3-michael@walle.cc>
Date:   Wed, 20 Apr 2022 21:19:26 +0200
From:   Michael Walle <michael@...le.cc>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH v3 2/2] pinctrl: ocelot: add optional shared reset

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@...le.cc>
Tested-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/pinctrl/pinctrl-ocelot.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index 1bdced67464b..843704fa8625 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"
@@ -1912,6 +1913,7 @@ 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;
@@ -1927,6 +1929,12 @@ 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))
+		return dev_err_probe(dev, PTR_ERR(reset),
+				     "Failed to get reset\n");
+	reset_control_reset(reset);
+
 	base = devm_ioremap_resource(dev,
 			platform_get_resource(pdev, IORESOURCE_MEM, 0));
 	if (IS_ERR(base))
-- 
2.30.2