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dmaengine: mv_xor_v2: Fix clock resource by adding a register clock 

On the CP110 components which are present on the Armada 7K/8K SoC we need
to explicitly enable the clock for the registers. However it is not
needed for the AP8xx component, that's why this clock is optional.

With this patch both clock have now a name, but in order to be backward
compatible, the name of the first clock is not used. It allows to still
use this clock with a device tree using the old binding.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Gregory CLEMENT 2018-03-07 16:40:10 +01:00 committed by Vinod Koul
parent d716d9b702
commit 3cd2c313f1
2 changed files with 25 additions and 6 deletions
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6
Documentation/devicetree/bindings/dma/mv-xor-v2.txt
View File

@ -11,7 +11,11 @@ Required properties:
interrupts.
Optional properties:
- clocks: Optional reference to the clock used by the XOR engine.
- clocks: Optional reference to the clocks used by the XOR engine.
- clock-names: mandatory if there is a second clock, in this case the
name must be "core" for the first clock and "reg" for the second
one
Example:

25
drivers/dma/mv_xor_v2.c
View File

@ -163,6 +163,7 @@ struct mv_xor_v2_device {
void __iomem *dma_base;
void __iomem *glob_base;
struct clk *clk;
struct clk *reg_clk;
struct tasklet_struct irq_tasklet;
struct list_head free_sw_desc;
struct dma_device dmadev;
@ -749,13 +750,26 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
if (ret)
return ret;
xor_dev->reg_clk = devm_clk_get(&pdev->dev, "reg");
if (PTR_ERR(xor_dev->reg_clk) != -ENOENT) {
if (!IS_ERR(xor_dev->reg_clk)) {
ret = clk_prepare_enable(xor_dev->reg_clk);
if (ret)
return ret;
} else {
return PTR_ERR(xor_dev->reg_clk);
}
}
xor_dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(xor_dev->clk) && PTR_ERR(xor_dev->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (IS_ERR(xor_dev->clk) && PTR_ERR(xor_dev->clk) == -EPROBE_DEFER) {
ret = EPROBE_DEFER;
goto disable_reg_clk;
}
if (!IS_ERR(xor_dev->clk)) {
ret = clk_prepare_enable(xor_dev->clk);
if (ret)
return ret;
goto disable_reg_clk;
}
ret = platform_msi_domain_alloc_irqs(&pdev->dev, 1,
@ -866,8 +880,9 @@ free_hw_desq:
free_msi_irqs:
platform_msi_domain_free_irqs(&pdev->dev);
disable_clk:
if (!IS_ERR(xor_dev->clk))
clk_disable_unprepare(xor_dev->clk);
clk_disable_unprepare(xor_dev->clk);
disable_reg_clk:
clk_disable_unprepare(xor_dev->reg_clk);
return ret;
}