linux-kernel - [PATCH v2 8/9] gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet

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Message-Id: <20221011-gpiolib-quirks-v2-8-73cb7176fd94@gmail.com>
Date:   Fri, 14 Oct 2022 10:54:32 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Alexander Stein <alexander.stein@...tq-group.com>,
        linux-kernel@...r.kernel.org,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org
Subject: [PATCH v2 8/9] gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet

Bindings for Freescale Fast Ethernet Controller use a separate
property "phy-reset-active-high" to specify polarity of its phy
gpio line. To allow converting the driver to gpiod API we need
to add this quirk to gpiolib.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/gpio/gpiolib-of.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index da274d9adcdf..805222a2e6bc 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -231,6 +231,33 @@ static void of_gpio_flags_quirks(const struct device_node *np,
 	    !strcmp(propname, "snps,reset-gpio") &&
 	    of_property_read_bool(np, "snps,reset-active-low"))
 		*flags |= OF_GPIO_ACTIVE_LOW;
+
+	/*
+	 * Freescale Fast Ethernet Controller uses a separate property to
+	 * describe polarity of the phy reset line.
+	 */
+	if (IS_ENABLED(CONFIG_FEC)) {
+		static const char * const fec_devices[] = {
+			"fsl,imx25-fec",
+			"fsl,imx27-fec",
+			"fsl,imx28-fec",
+			"fsl,imx6q-fec",
+			"fsl,mvf600-fec",
+			"fsl,imx6sx-fec",
+			"fsl,imx6ul-fec",
+			"fsl,imx8mq-fec",
+			"fsl,imx8qm-fec",
+			"fsl,s32v234-fec",
+			NULL
+		};
+
+		if (!strcmp(propname, "phy-reset-gpios") &&
+		    of_device_compatible_match(np, fec_devices)) {
+			bool active_high = of_property_read_bool(np,
+						"phy-reset-active-high");
+			of_gpio_quirk_polarity(np, active_high, flags);
+		}
+	}
 }
 
 /**

-- 
b4 0.11.0-dev-5166b