Hi Gregory,
On mer., mars 07 2018, Gregory CLEMENT <gregory.clement@xxxxxxxxxxx> wrote:
> 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 clocks 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@xxxxxxxxxxx>
> ---
> Changelog:
>
> v1 -> v2
>
> - Fix typos in the commit log
> - Add more explanation in te commit log
> - Only skip the reg clock usage if the clock is not presetn in the
> device tree (-ENOENT)
> - Add dt list in CC
>
>
> .../devicetree/bindings/dma/mv-xor-v2.txt | 6 +++++-
> drivers/dma/mv_xor_v2.c | 25 +++++++++++++++++-----
> 2 files changed, 25 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/dma/mv-xor-v2.txt b/Documentation/devicetree/bindings/dma/mv-xor-v2.txt
> index 217a90eaabe7..9c38bbe7e6d7 100644
> --- a/Documentation/devicetree/bindings/dma/mv-xor-v2.txt
> +++ b/Documentation/devicetree/bindings/dma/mv-xor-v2.txt
> @@ -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:
>
> diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c
> index f652a0e0f5a2..e3e854161dd0 100644
> --- a/drivers/dma/mv_xor_v2.c
> +++ b/drivers/dma/mv_xor_v2.c
> @@ -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) {
It should be "!= " there, a v3 is coming
Sorry for the noise,
Gregory
> + 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 @@ static int mv_xor_v2_probe(struct platform_device *pdev)
> 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;
> }
>
> --
> 2.16.1
>
> --
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--
Gregory Clement, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com
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