linux-kernel - Re: [PATCH 2/8] phy: rockchip-usb: introduce a common data-struct for the device

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Date:	Wed, 4 Nov 2015 15:46:04 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Romain Perier <romain.perier@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/8] phy: rockchip-usb: introduce a common data-struct for
 the device

Hi,

On Wed, Nov 4, 2015 at 1:44 PM, Heiko Stuebner <heiko@...ech.de> wrote:
> This introduces a common struct that holds data belonging to
> the umbrella device that contains all the phys and that we
> want to use later.
>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  drivers/phy/phy-rockchip-usb.c | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
> index dfc056b..dda1994 100644
> --- a/drivers/phy/phy-rockchip-usb.c
> +++ b/drivers/phy/phy-rockchip-usb.c
> @@ -36,9 +36,14 @@
>  #define SIDDQ_ON               BIT(13)
>  #define SIDDQ_OFF              (0 << 13)
>
> +struct rockchip_usb_phy_base {
> +       struct device *dev;
> +       struct regmap *reg_base;
> +};
> +
>  struct rockchip_usb_phy {
> +       struct rockchip_usb_phy_base *base;
>         unsigned int    reg_offset;
> -       struct regmap   *reg_base;
>         struct clk      *clk;
>         struct phy      *phy;
>  };
> @@ -46,7 +51,7 @@ struct rockchip_usb_phy {
>  static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
>                                            bool siddq)
>  {
> -       return regmap_write(phy->reg_base, phy->reg_offset,
> +       return regmap_write(phy->base->reg_base, phy->reg_offset,
>                             SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
>  }
>
> @@ -101,17 +106,23 @@ static void rockchip_usb_phy_action(void *data)
>  static int rockchip_usb_phy_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
> +       struct rockchip_usb_phy_base *phy_base;
>         struct rockchip_usb_phy *rk_phy;
>         struct phy_provider *phy_provider;
>         struct device_node *child;
> -       struct regmap *grf;
>         unsigned int reg_offset;
>         int err;
>
> -       grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
> -       if (IS_ERR(grf)) {
> +       phy_base = devm_kzalloc(dev, sizeof(*phy_base), GFP_KERNEL);
> +       if (!phy_base)
> +               return -ENOMEM;
> +
> +       phy_base->dev = dev;
> +       phy_base->reg_base = syscon_regmap_lookup_by_phandle(dev->of_node,
> +                                                            "rockchip,grf");
> +       if (IS_ERR(phy_base->reg_base)) {
>                 dev_err(&pdev->dev, "Missing rockchip,grf property\n");
> -               return PTR_ERR(grf);
> +               return PTR_ERR(phy_base->reg_base);
>         }
>
>         for_each_available_child_of_node(dev->of_node, child) {
> @@ -126,7 +137,6 @@ static int rockchip_usb_phy_probe(struct platform_device *pdev)
>                 }
>
>                 rk_phy->reg_offset = reg_offset;
> -               rk_phy->reg_base = grf;

I'm probably missing something, but I would have expected a line line:

  rk_phy->base = phy_base;

Otherwise how does "base" get assigned?  Ah, I see.  You forgot it in
this patch and then cheated and slipped it in in patch #3.  ;)  For
nice bisectability it probably belongs here, too...

-Doug
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