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Date: Thu, 22 Mar 2018 19:21:37 +0530
From: <harinikatakamlinux@...il.com>
To: <nicolas.ferre@...el.com>, <davem@...emloft.net>,
<harinikatakamlinux@...il.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<harinik@...inx.com>, <michals@...inx.com>, <appanad@...inx.com>
Subject: [RFC PATCH 2/5] net: macb: Support clock management for tsu_clk
From: Harini Katakam <harinik@...inx.com>
TSU clock needs to be enabled/disabled as per support in devicetree
and it should also be controlled during suspend/resume (WOL has no
dependency on this clock).
Signed-off-by: Harini Katakam <harinik@...inx.com>
---
drivers/net/ethernet/cadence/macb.h | 3 ++-
drivers/net/ethernet/cadence/macb_main.c | 30 +++++++++++++++++++++++++-----
2 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 8665982..9e7fb14 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -1074,7 +1074,7 @@ struct macb_config {
unsigned int dma_burst_length;
int (*clk_init)(struct platform_device *pdev, struct clk **pclk,
struct clk **hclk, struct clk **tx_clk,
- struct clk **rx_clk);
+ struct clk **rx_clk, struct clk **tsu_clk);
int (*init)(struct platform_device *pdev);
int jumbo_max_len;
};
@@ -1154,6 +1154,7 @@ struct macb {
struct clk *hclk;
struct clk *tx_clk;
struct clk *rx_clk;
+ struct clk *tsu_clk;
struct net_device *dev;
union {
struct macb_stats macb;
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index f4030c1..ae61927 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3245,7 +3245,7 @@ static void macb_probe_queues(void __iomem *mem,
static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
struct clk **hclk, struct clk **tx_clk,
- struct clk **rx_clk)
+ struct clk **rx_clk, struct clk **tsu_clk)
{
struct macb_platform_data *pdata;
int err;
@@ -3279,6 +3279,10 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
if (IS_ERR(*rx_clk))
*rx_clk = NULL;
+ *tsu_clk = devm_clk_get(&pdev->dev, "tsu_clk");
+ if (IS_ERR(*tsu_clk))
+ *tsu_clk = NULL;
+
err = clk_prepare_enable(*pclk);
if (err) {
dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
@@ -3303,8 +3307,17 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
goto err_disable_txclk;
}
+ err = clk_prepare_enable(*tsu_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable tsu_clk (%u)\n", err);
+ goto err_disable_rxclk;
+ }
+
return 0;
+err_disable_rxclk:
+ clk_disable_unprepare(*rx_clk);
+
err_disable_txclk:
clk_disable_unprepare(*tx_clk);
@@ -3754,13 +3767,14 @@ static const struct net_device_ops at91ether_netdev_ops = {
static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
struct clk **hclk, struct clk **tx_clk,
- struct clk **rx_clk)
+ struct clk **rx_clk, struct clk **tsu_clk)
{
int err;
*hclk = NULL;
*tx_clk = NULL;
*rx_clk = NULL;
+ *tsu_clk = NULL;
*pclk = devm_clk_get(&pdev->dev, "ether_clk");
if (IS_ERR(*pclk))
@@ -3898,11 +3912,12 @@ static int macb_probe(struct platform_device *pdev)
{
const struct macb_config *macb_config = &default_gem_config;
int (*clk_init)(struct platform_device *, struct clk **,
- struct clk **, struct clk **, struct clk **)
- = macb_config->clk_init;
+ struct clk **, struct clk **, struct clk **,
+ struct clk **) = macb_config->clk_init;
int (*init)(struct platform_device *) = macb_config->init;
struct device_node *np = pdev->dev.of_node;
struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
+ struct clk *tsu_clk = NULL;
unsigned int queue_mask, num_queues;
struct macb_platform_data *pdata;
bool native_io;
@@ -3930,7 +3945,7 @@ static int macb_probe(struct platform_device *pdev)
}
}
- err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk);
+ err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk, &tsu_clk);
if (err)
return err;
@@ -3967,6 +3982,7 @@ static int macb_probe(struct platform_device *pdev)
bp->hclk = hclk;
bp->tx_clk = tx_clk;
bp->rx_clk = rx_clk;
+ bp->tsu_clk = tsu_clk;
if (macb_config)
bp->jumbo_max_len = macb_config->jumbo_max_len;
@@ -4064,6 +4080,7 @@ static int macb_probe(struct platform_device *pdev)
clk_disable_unprepare(hclk);
clk_disable_unprepare(pclk);
clk_disable_unprepare(rx_clk);
+ clk_disable_unprepare(tsu_clk);
return err;
}
@@ -4091,6 +4108,7 @@ static int macb_remove(struct platform_device *pdev)
clk_disable_unprepare(bp->hclk);
clk_disable_unprepare(bp->pclk);
clk_disable_unprepare(bp->rx_clk);
+ clk_disable_unprepare(bp->tsu_clk);
of_node_put(bp->phy_node);
free_netdev(dev);
}
@@ -4117,6 +4135,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
clk_disable_unprepare(bp->pclk);
clk_disable_unprepare(bp->rx_clk);
}
+ clk_disable_unprepare(bp->tsu_clk);
return 0;
}
@@ -4137,6 +4156,7 @@ static int __maybe_unused macb_resume(struct device *dev)
clk_prepare_enable(bp->tx_clk);
clk_prepare_enable(bp->rx_clk);
}
+ clk_prepare_enable(bp->tsu_clk);
netif_device_attach(netdev);
--
2.7.4
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