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@walle.cc>
Tested-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Link: https://lore.kernel.org/r/20220420191926.3411830-3-michael@walle.cc
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index 1bdced6..843704f 100644 (file)
--- 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))