* [PATCH v2 1/2] arc_emac: fix probe error path
@ 2014-04-25 8:03 Heiko Stübner
2014-04-25 8:06 ` [PATCH v2 2/2] arc_emac: add clock handling Heiko Stübner
2014-04-27 23:54 ` [PATCH v2 1/2] arc_emac: fix probe error path David Miller
0 siblings, 2 replies; 4+ messages in thread
From: Heiko Stübner @ 2014-04-25 8:03 UTC (permalink / raw
To: David S. Miller; +Cc: Alexey Brodkin, netdev, Max Schwarz, linux-kernel
The probe function at the moment only frees the netdev but does not disconnect
the phy or removes the mdio bus it registered.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---
changes since v1:
- fix duplicate netif_api_del found by Max Schwarz
drivers/net/ethernet/arc/emac_main.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 9f45782..9747dda 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -683,7 +683,7 @@ static int arc_emac_probe(struct platform_device *pdev)
priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs);
if (IS_ERR(priv->regs)) {
err = PTR_ERR(priv->regs);
- goto out;
+ goto out_netdev;
}
dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
@@ -693,7 +693,7 @@ static int arc_emac_probe(struct platform_device *pdev)
if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
err = -ENODEV;
- goto out;
+ goto out_netdev;
}
dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
@@ -708,7 +708,7 @@ static int arc_emac_probe(struct platform_device *pdev)
ndev->name, ndev);
if (err) {
dev_err(&pdev->dev, "could not allocate IRQ\n");
- goto out;
+ goto out_netdev;
}
/* Get MAC address from device tree */
@@ -729,7 +729,7 @@ static int arc_emac_probe(struct platform_device *pdev)
if (!priv->rxbd) {
dev_err(&pdev->dev, "failed to allocate data buffers\n");
err = -ENOMEM;
- goto out;
+ goto out_netdev;
}
priv->txbd = priv->rxbd + RX_BD_NUM;
@@ -741,7 +741,7 @@ static int arc_emac_probe(struct platform_device *pdev)
err = arc_mdio_probe(pdev, priv);
if (err) {
dev_err(&pdev->dev, "failed to probe MII bus\n");
- goto out;
+ goto out_netdev;
}
priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
@@ -749,7 +749,7 @@ static int arc_emac_probe(struct platform_device *pdev)
if (!priv->phy_dev) {
dev_err(&pdev->dev, "of_phy_connect() failed\n");
err = -ENODEV;
- goto out;
+ goto out_mdio;
}
dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n",
@@ -759,14 +759,19 @@ static int arc_emac_probe(struct platform_device *pdev)
err = register_netdev(ndev);
if (err) {
- netif_napi_del(&priv->napi);
dev_err(&pdev->dev, "failed to register network device\n");
- goto out;
+ goto out_netif_api;
}
return 0;
-out:
+out_netif_api:
+ netif_napi_del(&priv->napi);
+ phy_disconnect(priv->phy_dev);
+ priv->phy_dev = NULL;
+out_mdio:
+ arc_mdio_remove(priv);
+out_netdev:
free_netdev(ndev);
return err;
}
--
1.9.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2 2/2] arc_emac: add clock handling
2014-04-25 8:03 [PATCH v2 1/2] arc_emac: fix probe error path Heiko Stübner
@ 2014-04-25 8:06 ` Heiko Stübner
2014-04-27 23:54 ` David Miller
2014-04-27 23:54 ` [PATCH v2 1/2] arc_emac: fix probe error path David Miller
1 sibling, 1 reply; 4+ messages in thread
From: Heiko Stübner @ 2014-04-25 8:06 UTC (permalink / raw
To: David S. Miller
Cc: Alexey Brodkin, netdev-u79uwXL29TY76Z2rM5mHXA, Max Schwarz,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
devicetree-u79uwXL29TY76Z2rM5mHXA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Kumar Gala
This adds ability for the arc_emac to really handle its supplying clock.
To get the needed clock-frequency either a real clock or the previous
clock-frequency property must be provided.
Signed-off-by: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
Tested-by: Max Schwarz <max.schwarz-BGeptl67XyCzQB+pC5nmwQ@public.gmane.org>
---
changes since v1:
- fix wrong clk error check found by Max Schwarz
Documentation/devicetree/bindings/net/arc_emac.txt | 12 +++++-
drivers/net/ethernet/arc/emac.h | 2 +
drivers/net/ethernet/arc/emac_main.c | 46 ++++++++++++++++------
3 files changed, 47 insertions(+), 13 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/arc_emac.txt b/Documentation/devicetree/bindings/net/arc_emac.txt
index 7fbb027..a1d71eb 100644
--- a/Documentation/devicetree/bindings/net/arc_emac.txt
+++ b/Documentation/devicetree/bindings/net/arc_emac.txt
@@ -4,11 +4,15 @@ Required properties:
- compatible: Should be "snps,arc-emac"
- reg: Address and length of the register set for the device
- interrupts: Should contain the EMAC interrupts
-- clock-frequency: CPU frequency. It is needed to calculate and set polling
-period of EMAC.
- max-speed: see ethernet.txt file in the same directory.
- phy: see ethernet.txt file in the same directory.
+Clock handling:
+The clock frequency is needed to calculate and set polling period of EMAC.
+It must be provided by one of:
+- clock-frequency: CPU frequency.
+- clocks: reference to the clock supplying the EMAC.
+
Child nodes of the driver are the individual PHY devices connected to the
MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.
@@ -19,7 +23,11 @@ Examples:
reg = <0xc0fc2000 0x3c>;
interrupts = <6>;
mac-address = [ 00 11 22 33 44 55 ];
+
clock-frequency = <80000000>;
+ /* or */
+ clocks = <&emac_clock>;
+
max-speed = <100>;
phy = <&phy0>;
diff --git a/drivers/net/ethernet/arc/emac.h b/drivers/net/ethernet/arc/emac.h
index 928fac6..53f85bf 100644
--- a/drivers/net/ethernet/arc/emac.h
+++ b/drivers/net/ethernet/arc/emac.h
@@ -11,6 +11,7 @@
#include <linux/dma-mapping.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
+#include <linux/clk.h>
/* STATUS and ENABLE Register bit masks */
#define TXINT_MASK (1<<0) /* Transmit interrupt */
@@ -131,6 +132,7 @@ struct arc_emac_priv {
struct mii_bus *bus;
void __iomem *regs;
+ struct clk *clk;
struct napi_struct napi;
struct net_device_stats stats;
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 9747dda..d647a7d 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -649,13 +649,6 @@ static int arc_emac_probe(struct platform_device *pdev)
return -ENODEV;
}
- /* Get CPU clock frequency from device tree */
- if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
- &clock_frequency)) {
- dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
- return -EINVAL;
- }
-
/* Get IRQ from device tree */
irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (!irq) {
@@ -687,13 +680,32 @@ static int arc_emac_probe(struct platform_device *pdev)
}
dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
+ priv->clk = of_clk_get(pdev->dev.of_node, 0);
+ if (IS_ERR(priv->clk)) {
+ /* Get CPU clock frequency from device tree */
+ if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+ &clock_frequency)) {
+ dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
+ err = -EINVAL;
+ goto out_netdev;
+ }
+ } else {
+ err = clk_prepare_enable(priv->clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable clock\n");
+ goto out_clkget;
+ }
+
+ clock_frequency = clk_get_rate(priv->clk);
+ }
+
id = arc_reg_get(priv, R_ID);
/* Check for EMAC revision 5 or 7, magic number */
if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
err = -ENODEV;
- goto out_netdev;
+ goto out_clken;
}
dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
@@ -708,7 +720,7 @@ static int arc_emac_probe(struct platform_device *pdev)
ndev->name, ndev);
if (err) {
dev_err(&pdev->dev, "could not allocate IRQ\n");
- goto out_netdev;
+ goto out_clken;
}
/* Get MAC address from device tree */
@@ -729,7 +741,7 @@ static int arc_emac_probe(struct platform_device *pdev)
if (!priv->rxbd) {
dev_err(&pdev->dev, "failed to allocate data buffers\n");
err = -ENOMEM;
- goto out_netdev;
+ goto out_clken;
}
priv->txbd = priv->rxbd + RX_BD_NUM;
@@ -741,7 +753,7 @@ static int arc_emac_probe(struct platform_device *pdev)
err = arc_mdio_probe(pdev, priv);
if (err) {
dev_err(&pdev->dev, "failed to probe MII bus\n");
- goto out_netdev;
+ goto out_clken;
}
priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
@@ -771,6 +783,12 @@ out_netif_api:
priv->phy_dev = NULL;
out_mdio:
arc_mdio_remove(priv);
+out_clken:
+ if (!IS_ERR(priv->clk))
+ clk_disable_unprepare(priv->clk);
+out_clkget:
+ if (!IS_ERR(priv->clk))
+ clk_put(priv->clk);
out_netdev:
free_netdev(ndev);
return err;
@@ -786,6 +804,12 @@ static int arc_emac_remove(struct platform_device *pdev)
arc_mdio_remove(priv);
unregister_netdev(ndev);
netif_napi_del(&priv->napi);
+
+ if (!IS_ERR(priv->clk)) {
+ clk_disable_unprepare(priv->clk);
+ clk_put(priv->clk);
+ }
+
free_netdev(ndev);
return 0;
--
1.9.0
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2 1/2] arc_emac: fix probe error path
2014-04-25 8:03 [PATCH v2 1/2] arc_emac: fix probe error path Heiko Stübner
2014-04-25 8:06 ` [PATCH v2 2/2] arc_emac: add clock handling Heiko Stübner
@ 2014-04-27 23:54 ` David Miller
1 sibling, 0 replies; 4+ messages in thread
From: David Miller @ 2014-04-27 23:54 UTC (permalink / raw
To: heiko; +Cc: Alexey.Brodkin, netdev, max.schwarz, linux-kernel
From: Heiko Stübner <heiko@sntech.de>
Date: Fri, 25 Apr 2014 10:03:29 +0200
> The probe function at the moment only frees the netdev but does not disconnect
> the phy or removes the mdio bus it registered.
>
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Applied.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2 2/2] arc_emac: add clock handling
2014-04-25 8:06 ` [PATCH v2 2/2] arc_emac: add clock handling Heiko Stübner
@ 2014-04-27 23:54 ` David Miller
0 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2014-04-27 23:54 UTC (permalink / raw
To: heiko
Cc: Alexey.Brodkin, netdev, max.schwarz, linux-kernel, devicetree,
robh+dt, pawel.moll, mark.rutland, ijc+devicetree, galak
From: Heiko Stübner <heiko@sntech.de>
Date: Fri, 25 Apr 2014 10:06:13 +0200
> This adds ability for the arc_emac to really handle its supplying clock.
> To get the needed clock-frequency either a real clock or the previous
> clock-frequency property must be provided.
>
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> Tested-by: Max Schwarz <max.schwarz@online.de>
Applied.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-04-27 23:54 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-04-25 8:03 [PATCH v2 1/2] arc_emac: fix probe error path Heiko Stübner
2014-04-25 8:06 ` [PATCH v2 2/2] arc_emac: add clock handling Heiko Stübner
2014-04-27 23:54 ` David Miller
2014-04-27 23:54 ` [PATCH v2 1/2] arc_emac: fix probe error path David Miller
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).