[3/8] clk: rk3399: Enable PCIE_PHY clock

Add PCIE_PHY clock enablement support on rk3399
clock driver.

This clock is enabled by default, so do nothing
if it triggers during the PCIe PHY probe other
PHY users on this clock will simply fail.

Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
 drivers/clk/rockchip/clk_rk3399.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

> From: Jagan Teki <jagan at amarulasolutions.com>
> Date: Sat, 25 Apr 2020 16:33:49 +0530
> 
> Add PCIE_PHY clock enablement support on rk3399
> clock driver.
> 
> This clock is enabled by default, so do nothing
> if it triggers during the PCIe PHY probe other
> PHY users on this clock will simply fail.

This breaks Ethernet on my firefly-rk3399, and I suspect it does the
same on other boards:

  In:    serial at ff1a0000
  Out:   serial at ff1a0000
  Err:   serial at ff1a0000
  Model: Firefly-RK3399 Board
  Net:   failed to enable clock 0
  No ethernet found.

Looking at the px30 clock driver, I think you need to add a few more
clocks here:

  SCLK_MAC,
  SCLK_MAC_RX,
  SCLK_MAC_TX,
  SCLK_MACREF,
  SCLK_MACREF_OUT,
  ACLK_GMAC,
  PCLK_GMAC

That makes it work again for me.

Cheers,

Mark

> Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> ---
>  drivers/clk/rockchip/clk_rk3399.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c
> index d822acace1..8e069fbade 100644
> --- a/drivers/clk/rockchip/clk_rk3399.c
> +++ b/drivers/clk/rockchip/clk_rk3399.c
> @@ -1071,12 +1071,27 @@ static int __maybe_unused rk3399_clk_set_parent(struct clk *clk,
>  	return -ENOENT;
>  }
>  
> +static int rk3399_clk_enable(struct clk *clk)
> +{
> +	switch (clk->id) {
> +	case SCLK_PCIEPHY_REF:
> +		/* do nothing, clk is enabled by default */
> +		break;
> +	default:
> +		debug("%s: unsupported clk %ld\n", __func__, clk->id);
> +		return -ENOENT;
> +	}
> +
> +	return 0;
> +}
> +
>  static struct clk_ops rk3399_clk_ops = {
>  	.get_rate = rk3399_clk_get_rate,
>  	.set_rate = rk3399_clk_set_rate,
>  #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
>  	.set_parent = rk3399_clk_set_parent,
>  #endif
> +	.enable = rk3399_clk_enable,
>  };
>  
>  #ifdef CONFIG_SPL_BUILD
> -- 
> 2.17.1
> 
>

On Sun, Apr 26, 2020 at 1:54 AM Mark Kettenis <mark.kettenis at xs4all.nl> wrote:
>
> > From: Jagan Teki <jagan at amarulasolutions.com>
> > Date: Sat, 25 Apr 2020 16:33:49 +0530
> >
> > Add PCIE_PHY clock enablement support on rk3399
> > clock driver.
> >
> > This clock is enabled by default, so do nothing
> > if it triggers during the PCIe PHY probe other
> > PHY users on this clock will simply fail.
>
> This breaks Ethernet on my firefly-rk3399, and I suspect it does the
> same on other boards:

Yes it does. It's affected by the v5.7-rc1 sync series. Will update
the fixes on that series, thanks!