netdev - Re: [RFC v8 net-next 11/16] net: mscc: ocelot: expose regfield definition to be used by other drivers

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Date:   Mon, 9 May 2022 10:56:39 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Colin Foster <colin.foster@...advantage.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Terry Bowman <terry.bowman@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [RFC v8 net-next 11/16] net: mscc: ocelot: expose regfield
 definition to be used by other drivers

On Sun, May 08, 2022 at 11:53:08AM -0700, Colin Foster wrote:
> The ocelot_regfields struct is common between several different chips, some
> of which can only be controlled externally. Export this structure so it
> doesn't have to be duplicated in these other drivers.
> 
> Rename the structure as well, to follow the conventions of other shared
> resources.
> 
> Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> ---

Doesn't the symbol need to be actually _exported_ (EXPORT_SYMBOL) to
work when CONFIG_MSCC_OCELOT_SWITCH_LIB is a module?

>  drivers/net/ethernet/mscc/ocelot_vsc7514.c | 60 +---------------------
>  drivers/net/ethernet/mscc/vsc7514_regs.c   | 59 +++++++++++++++++++++
>  include/soc/mscc/vsc7514_regs.h            |  2 +
>  3 files changed, 62 insertions(+), 59 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> index 68d205088665..a13fec7247d6 100644
> --- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> +++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> @@ -38,64 +38,6 @@ static const u32 *ocelot_regmap[TARGET_MAX] = {
>  	[DEV_GMII] = vsc7514_dev_gmii_regmap,
>  };
>  
> -static const struct reg_field ocelot_regfields[REGFIELD_MAX] = {
> -};
> -
>  static const struct ocelot_stat_layout ocelot_stats_layout[] = {
>  	{ .name = "rx_octets", .offset = 0x00, },
>  	{ .name = "rx_unicast", .offset = 0x01, },
> @@ -231,7 +173,7 @@ static int ocelot_chip_init(struct ocelot *ocelot, const struct ocelot_ops *ops)
>  	ocelot->num_mact_rows = 1024;
>  	ocelot->ops = ops;
>  
> -	ret = ocelot_regfields_init(ocelot, ocelot_regfields);
> +	ret = ocelot_regfields_init(ocelot, vsc7514_regfields);
>  	if (ret)
>  		return ret;
>  
> diff --git a/drivers/net/ethernet/mscc/vsc7514_regs.c b/drivers/net/ethernet/mscc/vsc7514_regs.c
> index c2af4eb8ca5d..847e64d11075 100644
> --- a/drivers/net/ethernet/mscc/vsc7514_regs.c
> +++ b/drivers/net/ethernet/mscc/vsc7514_regs.c
> @@ -9,6 +9,65 @@
>  #include <soc/mscc/vsc7514_regs.h>
>  #include "ocelot.h"
>  
> +const struct reg_field vsc7514_regfields[REGFIELD_MAX] = {
> +};
> +
>  const u32 vsc7514_ana_regmap[] = {
>  	REG(ANA_ADVLEARN,				0x009000),
>  	REG(ANA_VLANMASK,				0x009004),
> diff --git a/include/soc/mscc/vsc7514_regs.h b/include/soc/mscc/vsc7514_regs.h
> index ceee26c96959..9b40e7d00ec5 100644
> --- a/include/soc/mscc/vsc7514_regs.h
> +++ b/include/soc/mscc/vsc7514_regs.h
> @@ -10,6 +10,8 @@
>  
>  #include <soc/mscc/ocelot_vcap.h>
>  
> +extern const struct reg_field vsc7514_regfields[REGFIELD_MAX];
> +
>  extern const u32 vsc7514_ana_regmap[];
>  extern const u32 vsc7514_qs_regmap[];
>  extern const u32 vsc7514_qsys_regmap[];
> -- 
> 2.25.1
>