From: Dylan Hung <dylan_hung@aspeedtech.com>
To: <robh+dt@kernel.org>, <joel@jms.id.au>, <andrew@aj.id.au>,
<andrew@lunn.ch>, <hkallweit1@gmail.com>, <linux@armlinux.org.uk>,
<davem@davemloft.net>, <kuba@kernel.org>, <pabeni@redhat.com>,
<p.zabel@pengutronix.de>, <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
<netdev@vger.kernel.org>, <krzk+dt@kernel.org>
Cc: <BMC-SW@aspeedtech.com>
Subject: [PATCH v5 2/3] net: mdio: add reset control for Aspeed MDIO
Date: Wed, 13 Apr 2022 20:10:36 +0800 [thread overview]
Message-ID: <20220413121037.23748-3-dylan_hung@aspeedtech.com> (raw)
In-Reply-To: <20220413121037.23748-1-dylan_hung@aspeedtech.com>
Add reset assertion/deassertion for Aspeed MDIO. There are 4 MDIO
controllers embedded in Aspeed AST2600 SOC and share one reset control
register SCU50[3]. To work with old DT blobs which don't have the reset
property, devm_reset_control_get_optional_shared is used in this change.
Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
drivers/net/mdio/mdio-aspeed.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c
index e2273588c75b..1afb58ccc524 100644
--- a/drivers/net/mdio/mdio-aspeed.c
+++ b/drivers/net/mdio/mdio-aspeed.c
@@ -3,6 +3,7 @@
#include <linux/bitfield.h>
#include <linux/delay.h>
+#include <linux/reset.h>
#include <linux/iopoll.h>
#include <linux/mdio.h>
#include <linux/module.h>
@@ -37,6 +38,7 @@
struct aspeed_mdio {
void __iomem *base;
+ struct reset_control *reset;
};
static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum)
@@ -120,6 +122,12 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
if (IS_ERR(ctx->base))
return PTR_ERR(ctx->base);
+ ctx->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
+ if (IS_ERR(ctx->reset))
+ return PTR_ERR(ctx->reset);
+
+ reset_control_deassert(ctx->reset);
+
bus->name = DRV_NAME;
snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);
bus->parent = &pdev->dev;
@@ -129,6 +137,7 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
rc = of_mdiobus_register(bus, pdev->dev.of_node);
if (rc) {
dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
+ reset_control_assert(ctx->reset);
return rc;
}
@@ -139,7 +148,11 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
static int aspeed_mdio_remove(struct platform_device *pdev)
{
- mdiobus_unregister(platform_get_drvdata(pdev));
+ struct mii_bus *bus = (struct mii_bus *)platform_get_drvdata(pdev);
+ struct aspeed_mdio *ctx = bus->priv;
+
+ reset_control_assert(ctx->reset);
+ mdiobus_unregister(bus);
return 0;
}
--
2.25.1
next prev parent reply other threads:[~2022-04-13 12:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-13 12:10 [PATCH v5 0/3] Add reset deassertion for Aspeed MDIO Dylan Hung
2022-04-13 12:10 ` [PATCH v5 1/3] dt-bindings: net: add reset property for aspeed, ast2600-mdio binding Dylan Hung
2022-04-13 12:10 ` Dylan Hung [this message]
2022-04-13 12:10 ` [PATCH v5 3/3] ARM: dts: aspeed: add reset properties into MDIO nodes Dylan Hung
2022-04-14 12:22 ` [PATCH v5 0/3] Add reset deassertion for Aspeed MDIO Jakub Kicinski
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