linux-kernel - Re: [PATCH] phy: mvebu-cp110-utmi: support swapping d+/d- lanes by dts property

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Message-ID: <Zq--_WIgaPXPiYRQ@matsya>
Date: Sun, 4 Aug 2024 23:18:45 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Josua Mayer <josua@...id-run.com>
Cc: Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: mvebu-cp110-utmi: support swapping d+/d- lanes by
 dts property

On 04-07-24, 16:57, Josua Mayer wrote:
> CP11x UTMI PHY supports swapping D+/D- signals via digital control
> register 1.
> 
> Add support for the "swap-dx-lanes" device-tree property, which lists
> the port-ids that should swap D+ and D-.
> The property is evaluated in probe and applied before power-on
> during mvebu_cp110_utmi_port_setup.

It fails my build tests

drivers/phy/marvell/phy-mvebu-cp110-utmi.c:
In function ‘mvebu_cp110_utmi_phy_probe’:
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:89:
error: macro "of_property_for_each_u32" passed 5 arguments, but takes
just 3
  361 |                 of_property_for_each_u32(dev->of_node,
"swap-dx-lanes", prop, p, swap_dx)
      |
^
In file included from
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:15:
include/linux/of.h:1432: note:
macro "of_property_for_each_u32" defined here
 1432 | #define of_property_for_each_u32(np, propname, u)
\
      | 
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:17:
error: ‘of_property_for_each_u32’ undeclared (first use in this
function); did you mean ‘of_property_read_u32’?
  361 |                 of_property_for_each_u32(dev->of_node,
"swap-dx-lanes", prop, p, swap_dx)
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~
      |                 of_property_read_u32
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:17:
note: each undeclared identifier is reported only once for each function
it appears in
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:41:
error: expected ‘;’ before ‘if’
  361 |                 of_property_for_each_u32(dev->of_node,
"swap-dx-lanes", prop, p, swap_dx)
      |                                         ^
      |                                         ;
  362 |                         if (swap_dx == port_id)
      |                         ~~               
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:301:13:
error: unused variable ‘swap_dx’ [-Werror=unused-variable]
  301 |         u32 swap_dx = 0;
      |             ^~~~~~~
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:299:23:
error: unused variable ‘p’ [-Werror=unused-variable]
  299 |         const __be32 *p;
      |                       ^
drivers/phy/marvell/phy-mvebu-cp110-utmi.c:298:26:
error: unused variable ‘prop’ [-Werror=unused-variable]
  298 |         struct property *prop;
      |                          ^~~~
cc1: all warnings being treated as errors


> 
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
>  drivers/phy/marvell/phy-mvebu-cp110-utmi.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
> index 4922a5f3327d..5e403f842e9a 100644
> --- a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
> +++ b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
> @@ -62,6 +62,8 @@
>  #define   SQ_AMP_CAL_MASK			GENMASK(2, 0)
>  #define   SQ_AMP_CAL_VAL			1
>  #define   SQ_AMP_CAL_EN				BIT(3)
> +#define UTMI_DIG_CTRL1_REG			0x20
> +#define   SWAP_DPDM				BIT(15)
>  #define UTMI_CTRL_STATUS0_REG			0x24
>  #define   SUSPENDM				BIT(22)
>  #define   TEST_SEL				BIT(25)
> @@ -104,6 +106,7 @@ struct mvebu_cp110_utmi_port {
>  	struct mvebu_cp110_utmi *priv;
>  	u32 id;
>  	enum usb_dr_mode dr_mode;
> +	bool swap_dx;
>  };
>  
>  static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port)
> @@ -159,6 +162,13 @@ static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port)
>  	reg &= ~(VDAT_MASK | VSRC_MASK);
>  	reg |= (VDAT_VAL << VDAT_OFFSET) | (VSRC_VAL << VSRC_OFFSET);
>  	writel(reg, PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG);
> +
> +	/* Swap D+/D- */
> +	reg = readl(PORT_REGS(port) + UTMI_DIG_CTRL1_REG);
> +	reg &= ~(SWAP_DPDM);
> +	if (port->swap_dx)
> +		reg |= SWAP_DPDM;
> +	writel(reg, PORT_REGS(port) + UTMI_DIG_CTRL1_REG);
>  }
>  
>  static int mvebu_cp110_utmi_phy_power_off(struct phy *phy)
> @@ -285,7 +295,10 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>  	struct mvebu_cp110_utmi *utmi;
>  	struct phy_provider *provider;
>  	struct device_node *child;
> +	struct property *prop;
> +	const __be32 *p;
>  	u32 usb_devices = 0;
> +	u32 swap_dx = 0;
>  
>  	utmi = devm_kzalloc(dev, sizeof(*utmi), GFP_KERNEL);
>  	if (!utmi)
> @@ -345,6 +358,10 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>  			}
>  		}
>  
> +		of_property_for_each_u32(dev->of_node, "swap-dx-lanes", prop, p, swap_dx)
> +			if (swap_dx == port_id)
> +				port->swap_dx = 1;
> +
>  		/* Retrieve PHY capabilities */
>  		utmi->ops = &mvebu_cp110_utmi_phy_ops;
>  
> 
> ---
> base-commit: 4de480264948cbf2b08a72c39ee122a9f9761e03
> change-id: 20240704-mvebu-utmi-phy-84aa3bf3957d
> 
> Sincerely,
> -- 
> Josua Mayer <josua@...id-run.com>

-- 
~Vinod