Re: [PATCH v3 2/4] crypto: mxs-dcp - Add support for dcp clk

[Fabio Estevam]

Hi Leonard,

On Tue, Oct 16, 2018 at 12:58 PM Leonard Crestez
<leonard.crestez@xxxxxxx> wrote:

> +       /* DCP clock is optional, only used on some SOCs */
> +       sdcp->dcp_clk = devm_clk_get(dev, "dcp");
> +       if (IS_ERR(sdcp->dcp_clk)) {
> +               if (sdcp->dcp_clk != ERR_PTR(-ENOENT))
> +                       return PTR_ERR(sdcp->dcp_clk);
> +               sdcp->dcp_clk = NULL;

This dcp_clk assignment to NULL does not seem to be necessary.

> +
> +       ret = clk_prepare_enable(sdcp->dcp_clk);
> +       if (ret)
> +               return ret;
>
>         ret = devm_request_irq(dev, dcp_vmi_irq, mxs_dcp_irq, 0,
>                                "dcp-vmi-irq", sdcp);
>         if (ret) {
>                 dev_err(dev, "Failed to claim DCP VMI IRQ!\n");

In case of subsequent errors you should call
clk_disable_unprepare(sdcp->dcp_clk).