Re: [PATCH 3/4] net: mvneta: mmc: get optional axi clk

On Wed, 20 Jan 2016 10:31:18 +0100 Sebastian Hesselbarth  wrote:

On January 20, 2016 9:15:22 AM Jisheng Zhang wrote:

quoted

Some platforms may provide more than one clk for the mvneta IP, for
example Marvell BG4CT provides "core" clk for the mac core, and
"axi" clk for the AXI bus logic. Obviously this "axi" clk also need to
be enabled. This patch adds this optional "axi" clk support.  

Jisheng,

although I do not expect mvneta to appear on a non-AXI bus
anytime soon, how about naming the clock "bus" instead?

Good question. IIRC, this IP expects AXI bus, but I'll check with HW people.

Thanks a lot,
Jisheng

If you know the clock is only required for bus master DMA but
not for register access, "dma" would be an even better name.

Sebastian

quoted

Signed-off-by: Jisheng Zhang <redacted>
---
 drivers/net/ethernet/marvell/mvneta.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvneta.c 

b/drivers/net/ethernet/marvell/mvneta.c
index aca0a73..6bb709a 100644

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c

@@ -373,6 +373,8 @@ struct mvneta_port {

 	/* Core clock */
 	struct clk *clk;
+	/* AXI clock */
+	struct clk *clk_axi;
 	u8 mcast_count[256];
 	u16 tx_ring_size;
 	u16 rx_ring_size;

@@ -3615,6 +3617,10 @@ static int mvneta_probe(struct platform_device *pdev)

 	clk_prepare_enable(pp->clk);

+	pp->clk_axi = devm_clk_get(&pdev->dev, "axi");
+	if (!IS_ERR(pp->clk_axi))
+		clk_prepare_enable(pp->clk_axi);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pp->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(pp->base)) {

@@ -3727,6 +3733,7 @@ err_free_ports:
 	free_percpu(pp->ports);
 err_clk:
 	clk_disable_unprepare(pp->clk);
+	clk_disable_unprepare(pp->clk_axi);
 err_put_phy_node:
 	of_node_put(phy_node);
 err_free_irq:

@@ -3744,6 +3751,7 @@ static int mvneta_remove(struct platform_device *pdev)

 	unregister_netdev(dev);
 	clk_disable_unprepare(pp->clk);
+	clk_disable_unprepare(pp->clk_axi);
 	free_percpu(pp->ports);
 	free_percpu(pp->stats);
 	irq_dispose_mapping(dev->irq);
--

2.7.0.rc3
 

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