linux-kernel - Re: [PATCH] pinctrl: meson: meson8b: add the GPIOH pinmux settings for ETH

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Date:   Mon, 6 Jan 2020 14:16:51 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
        linux-amlogic@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pinctrl: meson: meson8b: add the GPIOH pinmux settings
 for ETH_RXD{2, 3}

On 26/12/2019 20:14, Martin Blumenstingl wrote:
> GPIOH_5 and GPIOH_6 can have two Ethernet related functions:
> - GPIOH_5 can be ETH_TXD1 or ETH_RXD3
> - GPIOH_6 can be ETH_TXD0 or ETH_RXD2
> 
> Add the bits for eth_rxd3_h and eth_rxd2_h so the ETH_RXD function can
> be disabled when using the ETH_TXD function of GPIOH_{5,6}. No problem
> was observed so far, but in theory this could lead to two different
> signals being routed to the same pad (which could break Ethernet).
> 
> These settings were found in the public "Amlogic Ethernet controller
> user guide":
> http://openlinux.amlogic.com/@api/deki/files/75/=Amlogic_Ethenet_controller_user_Guide.pdf
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>  drivers/pinctrl/meson/pinctrl-meson8b.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/meson/pinctrl-meson8b.c b/drivers/pinctrl/meson/pinctrl-meson8b.c
> index 2d5339edd0b7..6cd4b3ec1b40 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson8b.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson8b.c
> @@ -233,6 +233,8 @@ static const unsigned int hdmi_scl_pins[]	= { GPIOH_2 };
>  static const unsigned int hdmi_cec_0_pins[]	= { GPIOH_3 };
>  static const unsigned int eth_txd1_0_pins[]	= { GPIOH_5 };
>  static const unsigned int eth_txd0_0_pins[]	= { GPIOH_6 };
> +static const unsigned int eth_rxd3_h_pins[]	= { GPIOH_5 };
> +static const unsigned int eth_rxd2_h_pins[]	= { GPIOH_6 };
>  static const unsigned int clk_24m_out_pins[]	= { GPIOH_9 };
>  
>  static const unsigned int spi_ss1_pins[]	= { GPIOH_0 };
> @@ -535,6 +537,8 @@ static struct meson_pmx_group meson8b_cbus_groups[] = {
>  	GROUP(spi_miso_1,	9,	12),
>  	GROUP(spi_mosi_1,	9,	11),
>  	GROUP(spi_sclk_1,	9,	10),
> +	GROUP(eth_rxd3_h,	6,	15),
> +	GROUP(eth_rxd2_h,	6,	14),
>  	GROUP(eth_txd3,		6,	13),
>  	GROUP(eth_txd2,		6,	12),
>  	GROUP(eth_tx_clk,	6,	11),
> @@ -746,7 +750,8 @@ static const char * const ethernet_groups[] = {
>  	"eth_tx_clk", "eth_tx_en", "eth_txd1_0", "eth_txd1_1",
>  	"eth_txd0_0", "eth_txd0_1", "eth_rx_clk", "eth_rx_dv",
>  	"eth_rxd1", "eth_rxd0", "eth_mdio_en", "eth_mdc", "eth_ref_clk",
> -	"eth_txd2", "eth_txd3", "eth_rxd3", "eth_rxd2"
> +	"eth_txd2", "eth_txd3", "eth_rxd3", "eth_rxd2",
> +	"eth_rxd3_h", "eth_rxd2_h"
>  };
>  
>  static const char * const i2c_a_groups[] = {
> 

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>