netdev - [RFC v8 net-next 03/16] net: ocelot: add interface to get regmaps when exernally controlled

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Date:   Sun,  8 May 2022 11:53:00 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     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,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [RFC v8 net-next 03/16] net: ocelot: add interface to get regmaps when exernally controlled

Ocelot chips have several peripherals: pinctrl, sgpio, miim... If the chip
is in a configuration where it is being externally controlled via SPI, the
child device will need to request a resource from the parent.

Add the function call that will be used in those scenarios so that drivers
can be updated before the full functionality is added.

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 include/soc/mscc/ocelot.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 8d8d46778f7e..1897119ebb9a 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -1039,4 +1039,11 @@ ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
 }
 #endif
 
+static inline struct regmap *
+ocelot_init_regmap_from_resource(struct device *child,
+				 const struct resource *res)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 #endif
-- 
2.25.1