netdev - Re: [PATCH net-next v3 2/2] net:dsa:microchip: add property to select internal RMII reference clock

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Date: Wed, 18 Oct 2023 15:52:27 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Ante Knezic <ante.knezic@...mholz.de>
Cc: netdev@...r.kernel.org, woojung.huh@...rochip.com, f.fainelli@...il.com,
	olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	marex@...x.de, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v3 2/2] net:dsa:microchip: add property to
 select internal RMII reference clock

On Wed, Oct 18, 2023 at 11:24:14AM +0200, Ante Knezic wrote:
> Microchip KSZ8863/KSZ8873 have the ability to select between internal
> and external RMII reference clock. By default, reference clock
> needs to be provided via REFCLKI_3 pin. If required, device can be
> setup to provide RMII clock internally so that REFCLKI_3 pin can be
> left unconnected.
> Add a new "microchip,rmii-clk-internal" property which will set
> RMII clock reference to internal. If property is not set, reference
> clock needs to be provided externally.
> 
> Signed-off-by: Ante Knezic <ante.knezic@...mholz.de>
> ---
>  drivers/net/dsa/microchip/ksz8795.c     | 10 +++++++++-
>  drivers/net/dsa/microchip/ksz8795_reg.h |  3 +++
>  drivers/net/dsa/microchip/ksz_common.h  |  1 +
>  3 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
> index 91aba470fb2f..b50ad9552c65 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -1312,8 +1312,16 @@ void ksz8_port_setup(struct ksz_device *dev, int port, bool cpu_port)
>  	ksz_port_cfg(dev, port, P_PRIO_CTRL, PORT_802_1P_ENABLE, true);
>  
>  	if (cpu_port) {
> -		if (!ksz_is_ksz88x3(dev))
> +		if (!ksz_is_ksz88x3(dev)) {
>  			ksz8795_cpu_interface_select(dev, port);
> +		} else {
> +			dev->rmii_clk_internal = of_property_read_bool(dev->dev->of_node,
> +								       "microchip,rmii-clk-internal");
> +
> +			ksz_cfg(dev, KSZ88X3_REG_FVID_AND_HOST_MODE,
> +				KSZ88X3_PORT3_RMII_CLK_INTERNAL,
> +				dev->rmii_clk_internal);
> +		}

It looks like this is the only use of dev->rmii_clk_internal? So does
it actually need to be a member of ksz_device? 

   Andrew