netdev - Re: [PATCH v2 net-next 7/7] net: dsa: Add Lantiq / Intel DSA driver for vrx200

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Date:   Sat, 1 Sep 2018 23:44:40 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        john@...ozen.org, linux-mips@...ux-mips.org, dev@...sin.me,
        hauke.mehrtens@...el.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 net-next 7/7] net: dsa: Add Lantiq / Intel DSA driver
 for vrx200

On 09/01/2018 02:05 PM, Hauke Mehrtens wrote:
> This adds the DSA driver for the GSWIP Switch found in the VRX200 SoC.
> This switch is integrated in the DSL SoC, this SoC uses a GSWIP version
> 2.1, there are other SoCs using different versions of this IP block, but
> this driver was only tested with the version found in the VRX200.
> Currently only the basic features are implemented which will forward all
> packages to the CPU and let the CPU do the forwarding. The hardware also
> support Layer 2 offloading which is not yet implemented in this driver.
> 
> The GPHY FW loaded is now done by this driver and not any more by the
> separate driver in drivers/soc/lantiq/gphy.c, I will remove this driver
> is a separate patch. to make use of the GPHY this switch driver is
> needed anyway. Other SoCs have more embedded GPHYs so this driver should
> support a variable number of GPHYs. After the firmware was loaded the
> GPHY can be probed on the MDIO bus and it behaves like an external GPHY,
> without the firmware it can not be probed on the MDIO bus.
> 
> Currently this depends on SOC_TYPE_XWAY because the SoC revision
> detection function ltq_soc_type() is used to load the correct GPHY
> firmware on the VRX200 SoCs.
> 
> The clock names in the sysctrl.c file have to be changed because the
> clocks are now used by a different driver. This should be cleaned up and
> a real common clock driver should provide the clocks instead.
> 
> Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
> ---
>  MAINTAINERS                     |    2 +
>  arch/mips/lantiq/xway/sysctrl.c |    8 +-
>  drivers/net/dsa/Kconfig         |    8 +
>  drivers/net/dsa/Makefile        |    1 +
>  drivers/net/dsa/lantiq_gswip.c  | 1018 +++++++++++++++++++++++++++++++++++++++
>  drivers/net/dsa/lantiq_pce.h    |  153 ++++++
>  6 files changed, 1186 insertions(+), 4 deletions(-)
>  create mode 100644 drivers/net/dsa/lantiq_gswip.c
>  create mode 100644 drivers/net/dsa/lantiq_pce.h
> 

.....

> +
> +static int gswip_gphy_fw_list(struct gswip_priv *priv,
> +			      struct device_node *gphy_fw_list_np)
> +{
> +	struct device *dev = priv->dev;
> +	struct device_node *gphy_fw_np;
> +	const struct of_device_id *match;
> +	int err;
> +	int i = 0;
> +
> +	if (of_device_is_compatible(dev->of_node, "lantiq,xrx200-gphy-fw")) {
> +		switch (ltq_soc_type()) {

I just found out that the older revision of the xrx200 SoC uses also an
older GSWIP version, so we do not have to call ltq_soc_type() here, but
can use the GSWIP version register.
xRX200 rev 1.1 uses GSWIP 2.0, xrx200 rev 1.2 uses GSWIP 2.1.
1e10804c: 00000100 on xRX200 rev 1.1
1e10804c: 00000021 on xRX200 rev 1.2

Then I can also remove the compile dependency on the Lantiq arch code.

> +		case SOC_TYPE_VR9:
> +			priv->gphy_fw_name_cfg = &xrx200a1x_gphy_data;
> +			break;
> +		case SOC_TYPE_VR9_2:
> +			priv->gphy_fw_name_cfg = &xrx200a2x_gphy_data;
> +			break;
> +		}
> +	}
> +

.....

> +
> +	platform_set_drvdata(pdev, priv);
> +
> +	version = gswip_switch_r(priv, GSWIP_VERSION);
> +	dev_info(dev, "probed GSWIP version %lx mod %lx\n",
> +		 (version & GSWIP_VERSION_REV_MASK) >> GSWIP_VERSION_REV_SHIFT,
> +		 (version & GSWIP_VERSION_MOD_MASK) >> GSWIP_VERSION_MOD_SHIFT);
> +	return 0;
> +



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