linux-kernel - Re: [v3 PATCH 3/5] phy: Add USB Type-C PHY driver for rk3399

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Date:	Thu, 23 Jun 2016 14:47:18 -0700
From:	Guenter Roeck <groeck@...gle.com>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	Douglas Anderson <dianders@...omium.org>,
	Tomasz Figa <tfiga@...omium.org>,
	Heiko Stübner <heiko@...ech.de>,
	姚智情 <yzq@...k-chips.com>,
	Guenter Roeck <groeck@...omium.org>, myungjoo.ham@...sung.com,
	cw00.choi@...sung.com,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Kever Yang <kever.yang@...k-chips.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [v3 PATCH 3/5] phy: Add USB Type-C PHY driver for rk3399

Hi Chris,

On Thu, Jun 23, 2016 at 5:51 AM, Chris Zhong <zyw@...k-chips.com> wrote:
> Add a PHY provider driver for the rk3399 SoC Type-c PHY. The USB
> Type-C PHY is designed to support the USB3 and DP applications. The
> PHY basically has two main components: USB3 and DisplyPort. USB3
> operates in SuperSpeed mode and the DP can operate at RBR, HBR and
> HBR2 data rates.
>
> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
> Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
>
[ ... ]

> +
> +static void tcphy_get_state(struct rockchip_typec_phy *tcphy,
> +                           struct extcon_dev *edev)
> +{
> +       int mode;
> +       bool plugged, flip, pin_assign, dfp, ufp, dp;
> +
> +       ufp = extcon_get_cable_state_(edev, EXTCON_USB);
> +       dfp = extcon_get_cable_state_(edev, EXTCON_USB_HOST);
> +       dp = extcon_get_cable_state_(edev, EXTCON_DISP_DP);
> +       flip = extcon_get_cable_state_(edev, EXTCON_TYPEC_POLARITY);
> +       pin_assign = extcon_get_cable_state_(edev, EXTCON_TYPEC_PIN_ASSIGN);
> +
> +       plugged = ufp | dfp | dp;
> +       tcphy->flip = flip;
> +
> +       if (plugged) {
> +               if (ufp) {
> +                       mode = MODE_UFP_USB;
> +               } else if (dfp && !dp) {
> +                       mode = MODE_DFP_USB;
> +               } else if (dfp && dp) {
> +                       mode = MODE_DFP_USB | MODE_DFP_DP;
> +                       tcphy->pin_assign = pin_assign ? PIN_MAP_D : PIN_MAP_B;
> +               } else {
> +                       mode = MODE_DFP_DP;
> +                       tcphy->pin_assign = pin_assign ? PIN_MAP_C : PIN_MAP_A;

I am having trouble extracting pin_assign from our code. What
determines if map A or C should be selected ?

Thanks,
Guenter