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Date:	Fri, 12 Dec 2014 16:19:49 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Yunzhi Li <lyz@...k-chips.com>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Heiko Stübner <heiko@...ech.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	jwerner@...omium.org, Olof Johansson <olof@...om.net>,
	Tao Huang <huangtao@...k-chips.com>,
	Chris <zyw@...k-chips.com>, Eddie Cai <cf@...k-chips.com>
Subject: Re: [PATCH v7 2/5] phy: add a driver for the Rockchip SoC internal
 USB2.0 PHY

Yunzhi,

On Fri, Dec 12, 2014 at 7:07 AM, Yunzhi Li <lyz@...k-chips.com> wrote:
> This patch to add a generic PHY driver for ROCKCHIP usb PHYs,
> currently this driver can support RK3288. The RK3288 SoC have
> three independent USB PHY IPs which are all configured through a
> set of registers located in the GRF (general register files)
> module.
>
> Signed-off-by: Yunzhi Li <lyz@...k-chips.com>
>
> ---
>
> Changes in v7:
> - Accept Kishon's comments to use phandle args to find a phy
>   struct directly and get rid of using a custom of_xlate
>   function.

I'm going to assume you didn't test this version, since it doesn't
work for me.  At suspend time power is high and my printouts in the
powerup/powerdown code aren't called...


> +       for_each_available_child_of_node(dev->of_node, child) {
> +               rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
> +               if (!rk_phy)
> +                       return -ENOMEM;
> +
> +               if (of_property_read_u32(child, "reg", &reg_offset)) {
> +                       dev_err(dev, "missing reg property in node %s\n",
> +                               child->name);
> +                       return -EINVAL;
> +               }
> +
> +               rk_phy->reg_offset = reg_offset;
> +               rk_phy->reg_base = grf;
> +
> +               rk_phy->clk = of_clk_get_by_name(child, "phyclk");
> +               if (IS_ERR(rk_phy->clk))
> +                       rk_phy->clk = NULL;
> +
> +               rk_phy->phy = devm_phy_create(dev, child, &ops);
> +               if (IS_ERR(rk_phy->phy)) {
> +                       dev_err(dev, "failed to create PHY\n");
> +                       return PTR_ERR(rk_phy->phy);
> +               }
> +               phy_set_drvdata(rk_phy->phy, rk_phy);
> +       }
> +
> +       phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

I think your bug is here.  I think you now need to register 3 phy
providers, not just one.

I'll continue to assert my utter noviceness with this code, but my
attempt at a solution (which works) can be found at:

https://chromium-review.googlesource.com/235456

-Doug
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