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Message-ID: <1470993105-17051-1-git-send-email-shubhrajyoti.datta@xilinx.com>
Date: Fri, 12 Aug 2016 14:41:45 +0530
From: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
To: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <soren.brinkmann@...inx.com>, <shubhrajyoti.datta@...il.com>,
<michal.simek@...inx.com>,
Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: [PATCH RFC] net: ethernet: macb: Add support for rx_clk
Some of the platforms like zynqmp ultrascale+ has a
separate clock gate for the rx clock. Add an optional
rx_clk so that the clock can be enabled.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
---
Documentation/devicetree/bindings/net/macb.txt | 2 +-
drivers/net/ethernet/cadence/macb.c | 27 ++++++++++++++++++++++----
drivers/net/ethernet/cadence/macb.h | 4 +++-
3 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/macb.txt b/Documentation/devicetree/bindings/net/macb.txt
index b5a42df..315beda 100644
--- a/Documentation/devicetree/bindings/net/macb.txt
+++ b/Documentation/devicetree/bindings/net/macb.txt
@@ -20,7 +20,7 @@ Required properties:
- phy-mode: See ethernet.txt file in the same directory.
- clock-names: Tuple listing input clock names.
Required elements: 'pclk', 'hclk'
- Optional elements: 'tx_clk'
+ Optional elements: 'tx_clk', 'rx_clk'
- clocks: Phandles to input clocks.
Optional properties for PHY child node:
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 89c0cfa..1e9fd5c 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -2303,7 +2303,8 @@ 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 **hclk, struct clk **tx_clk,
+ struct clk **rx_clk)
{
int err;
@@ -2325,6 +2326,10 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
if (IS_ERR(*tx_clk))
*tx_clk = NULL;
+ *rx_clk = devm_clk_get(&pdev->dev, "rx_clk");
+ if (IS_ERR(*rx_clk))
+ *rx_clk = NULL;
+
err = clk_prepare_enable(*pclk);
if (err) {
dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
@@ -2343,8 +2348,17 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
goto err_disable_hclk;
}
+ err = clk_prepare_enable(*rx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err);
+ goto err_disable_txclk;
+ }
+
return 0;
+err_disable_txclk:
+ clk_disable_unprepare(*tx_clk);
+
err_disable_hclk:
clk_disable_unprepare(*hclk);
@@ -2857,13 +2871,13 @@ MODULE_DEVICE_TABLE(of, macb_dt_ids);
static int macb_probe(struct platform_device *pdev)
{
int (*clk_init)(struct platform_device *, struct clk **,
- struct clk **, struct clk **)
+ struct clk **, struct clk **, struct clk **)
= macb_clk_init;
int (*init)(struct platform_device *) = macb_init;
struct device_node *np = pdev->dev.of_node;
struct device_node *phy_node;
const struct macb_config *macb_config = NULL;
- struct clk *pclk, *hclk = NULL, *tx_clk = NULL;
+ struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
unsigned int queue_mask, num_queues;
struct macb_platform_data *pdata;
bool native_io;
@@ -2891,7 +2905,7 @@ static int macb_probe(struct platform_device *pdev)
}
}
- err = clk_init(pdev, &pclk, &hclk, &tx_clk);
+ err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk);
if (err)
return err;
@@ -2927,6 +2941,7 @@ static int macb_probe(struct platform_device *pdev)
bp->pclk = pclk;
bp->hclk = hclk;
bp->tx_clk = tx_clk;
+ bp->rx_clk = rx_clk;
if (macb_config)
bp->jumbo_max_len = macb_config->jumbo_max_len;
@@ -3020,6 +3035,7 @@ err_disable_clocks:
clk_disable_unprepare(tx_clk);
clk_disable_unprepare(hclk);
clk_disable_unprepare(pclk);
+ clk_disable_unprepare(rx_clk);
return err;
}
@@ -3046,6 +3062,7 @@ static int macb_remove(struct platform_device *pdev)
clk_disable_unprepare(bp->tx_clk);
clk_disable_unprepare(bp->hclk);
clk_disable_unprepare(bp->pclk);
+ clk_disable_unprepare(bp->rx_clk);
free_netdev(dev);
}
@@ -3069,6 +3086,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
clk_disable_unprepare(bp->tx_clk);
clk_disable_unprepare(bp->hclk);
clk_disable_unprepare(bp->pclk);
+ clk_disable_unprepare(bp->rx_clk);
}
return 0;
@@ -3088,6 +3106,7 @@ static int __maybe_unused macb_resume(struct device *dev)
clk_prepare_enable(bp->pclk);
clk_prepare_enable(bp->hclk);
clk_prepare_enable(bp->tx_clk);
+ clk_prepare_enable(bp->rx_clk);
}
netif_device_attach(netdev);
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 36893d8..10485b6 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -763,7 +763,8 @@ struct macb_config {
u32 caps;
unsigned int dma_burst_length;
int (*clk_init)(struct platform_device *pdev, struct clk **pclk,
- struct clk **hclk, struct clk **tx_clk);
+ struct clk **hclk, struct clk **tx_clk,
+ struct clk **rx_clk);
int (*init)(struct platform_device *pdev);
int jumbo_max_len;
};
@@ -809,6 +810,7 @@ struct macb {
struct clk *pclk;
struct clk *hclk;
struct clk *tx_clk;
+ struct clk *rx_clk;
struct net_device *dev;
struct napi_struct napi;
struct net_device_stats stats;
--
2.1.1
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