linux-kernel - [RFC v7 net-next 04/13] net: ocelot: add interface to get regmaps when exernally controlled

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Message-Id: <20220307021208.2406741-5-colin.foster@in-advantage.com>
Date:   Sun,  6 Mar 2022 18:11:59 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-phy@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Marc Zyngier <maz@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Angela Czubak <acz@...ihalf.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "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>, katie.morris@...advantage.com
Subject: [RFC v7 net-next 04/13] 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 ee3c59639d70..998616511ffb 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -1018,4 +1018,11 @@ ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
 }
 #endif
 
+static inline struct regmap *
+ocelot_get_regmap_from_resource(struct device *child,
+				const struct resource *res)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 #endif
-- 
2.25.1