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From:   Horatiu Vultur <horatiu.vultur@microchip.com>
To:     <linus.walleij@linaro.org>, <robh+dt@kernel.org>,
        <lars.povlsen@microchip.com>, <Steen.Hegelund@microchip.com>,
        <UNGLinuxDriver@microchip.com>, <p.zabel@pengutronix.de>,
        <linux-gpio@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
CC:     Horatiu Vultur <horatiu.vultur@microchip.com>
Subject: [PATCH v6 2/2] pinctrl: microchip sgpio: use reset driver
Date:   Mon, 18 Oct 2021 10:57:54 +0200
Message-ID: <20211018085754.1066056-3-horatiu.vultur@microchip.com>
In-Reply-To: <20211018085754.1066056-1-horatiu.vultur@microchip.com>
References: <20211018085754.1066056-1-horatiu.vultur@microchip.com>
MIME-Version: 1.0
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Precedence: bulk

On lan966x platform when the switch gets reseted then also the sgpio
gets reseted. The fix for this is to extend also the sgpio driver to
call the reset driver which will be reseted only once by the first
driver that is probed.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 drivers/pinctrl/pinctrl-microchip-sgpio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
index 072bccdea2a5..78765faa245a 100644
--- a/drivers/pinctrl/pinctrl-microchip-sgpio.c
+++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
@@ -17,6 +17,7 @@
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/reset.h>
 
 #include "core.h"
 #include "pinconf.h"
@@ -803,6 +804,7 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
 	int div_clock = 0, ret, port, i, nbanks;
 	struct device *dev = &pdev->dev;
 	struct fwnode_handle *fwnode;
+	struct reset_control *reset;
 	struct sgpio_priv *priv;
 	struct clk *clk;
 	u32 val;
@@ -813,6 +815,11 @@ static int microchip_sgpio_probe(struct platform_device *pdev)
 
 	priv->dev = dev;
 
+	reset = devm_reset_control_get_optional_shared(&pdev->dev, "switch");
+	if (IS_ERR(reset))
+		return dev_err_probe(dev, PTR_ERR(reset), "Failed to get reset\n");
+	reset_control_reset(reset);
+
 	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk))
 		return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
-- 
2.33.0