pinctrl: microchip sgpio: use reset driver

BugLink: https://bugs.launchpad.net/bugs/1969110
[ Upstream commit 0b90315af7602aeb40fe7b6255ab212a19dbd78e ]

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>
Reviewed-by: Steen Hegelund <steen.hegelund@microchip.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20211018085754.1066056-3-horatiu.vultur@microchip.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit c6f009fe90f1648cd67c636bb495e80af915c115)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
index 072bccdea2a5db1a62ff73987da35441b8985d44..78765faa245aea1fc1d47bd030465f7d5a180e89 100644 (file)
--- 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");