linux-kernel - Re: [PATCH 7/7] gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet

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Message-ID: <12081856.O9o76ZdvQC@steina-w>
Date:   Wed, 12 Oct 2022 08:14:46 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-arm-kernel@...ts.infradead.org,
        Daniel Thompson <daniel.thompson@...aro.org>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 7/7] gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet

Am Mittwoch, 12. Oktober 2022, 00:19:35 CEST schrieb Dmitry Torokhov:
> 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 3200d705fbe3..c3d3fe4d927c 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,imx6mq-fec",
> +			"fsl,imx6qm-fec",

These two should be 'fsl,imx8mq-fec' & 'fsl,imx8qm-fec' (imx8 instead of 
imx6).

Best regards,
Alexander

> +			"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);
> +		}
> +	}
>  }
> 
>  /**