linux-kernel - Re: [PATCH v2 3/4] usb: musb: da8xx: Add DT support for the DA8xx driver

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Message-ID: <6bb1ca27-3aa4-c22b-c09a-9163f9aabeef@lechnology.com>
Date:   Wed, 26 Oct 2016 22:26:55 -0500
From:   David Lechner <david@...hnology.com>
To:     Alexandre Bailon <abailon@...libre.com>, khilman@...libre.com,
        robh+dt@...nel.org, b-liu@...com
Cc:     devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Petr Kulhavy <petr@...ix.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/4] usb: musb: da8xx: Add DT support for the DA8xx
 driver

On 10/26/2016 10:03 AM, Alexandre Bailon wrote:
> From: Petr Kulhavy <petr@...ix.com>
>
> This adds DT support for TI DA8xx/OMAP-L1x/AM17xx/AM18xx MUSB driver
>
> Signed-off-by: Petr Kulhavy <petr@...ix.com>
> Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> ---
>  drivers/usb/musb/da8xx.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>
> diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
> index 210b7e4..bfa571d 100644
> --- a/drivers/usb/musb/da8xx.c
> +++ b/drivers/usb/musb/da8xx.c
> @@ -6,6 +6,9 @@
>   * Based on the DaVinci "glue layer" code.
>   * Copyright (C) 2005-2006 by Texas Instruments
>   *
> + * DT support
> + * Copyright (c) 2016 Petr Kulhavy <petr@...ix.com>
> + *
>   * This file is part of the Inventra Controller Driver for Linux.
>   *
>   * The Inventra Controller Driver for Linux is free software; you
> @@ -433,6 +436,21 @@ static int da8xx_musb_exit(struct musb *musb)
>  	return 0;
>  }
>
> +static inline u8 get_vbus_power(struct device *dev)
> +{
> +	struct regulator *vbus_supply;
> +	int current_uA;
> +
> +	vbus_supply = regulator_get_optional(dev, "vbus");
> +	if (IS_ERR(vbus_supply))
> +		return 255;
> +	current_uA = regulator_get_current_limit(vbus_supply);
> +	regulator_put(vbus_supply);
> +	if (current_uA <= 0 || current_uA > 510000)
> +		return 255;
> +	return current_uA / 1000 / 2;
> +}
> +
>  static const struct musb_platform_ops da8xx_ops = {
>  	.quirks		= MUSB_DMA_CPPI | MUSB_INDEXED_EP,
>  	.init		= da8xx_musb_init,
> @@ -458,6 +476,12 @@ static const struct platform_device_info da8xx_dev_info = {
>  	.dma_mask	= DMA_BIT_MASK(32),
>  };
>
> +static const struct musb_hdrc_config da8xx_config = {
> +	.ram_bits = 10,
> +	.num_eps = 5,
> +	.multipoint = 1,
> +};
> +
>  static int da8xx_probe(struct platform_device *pdev)
>  {
>  	struct resource musb_resources[2];
> @@ -465,7 +489,9 @@ static int da8xx_probe(struct platform_device *pdev)
>  	struct da8xx_glue		*glue;
>  	struct platform_device_info	pinfo;
>  	struct clk			*clk;
> +	struct device_node		*np = pdev->dev.of_node;
>  	int				ret;
> +	struct resource *res;

res is not used anywhere

>
>  	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
>  	if (!glue)
> @@ -486,6 +512,18 @@ static int da8xx_probe(struct platform_device *pdev)
>  	glue->dev			= &pdev->dev;
>  	glue->clk			= clk;
>
> +	if (IS_ENABLED(CONFIG_OF) && np) {
> +		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> +		if (!pdata) {
> +			/* FIXME */

Why FIXME? I don't see anything that needs to be fixed here.

> +			return -ENOMEM;
> +		}
> +
> +		pdata->config	= &da8xx_config;
> +		pdata->mode	= musb_get_mode(&pdev->dev);
> +		pdata->power	= get_vbus_power(&pdev->dev);
> +	}
> +
>  	pdata->platform_ops		= &da8xx_ops;
>
>  	glue->usb_phy = usb_phy_generic_register();
> @@ -536,11 +574,20 @@ static int da8xx_remove(struct platform_device *pdev)
>  	return 0;
>  }
>

Shouldn't you have #ifdef CONFIG_OF here since you are using 
of_match_ptr() below?

> +static const struct of_device_id da8xx_id_table[] = {
> +	{
> +		.compatible = "ti,da830-musb",
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, da8xx_id_table);

#endif

> +
>  static struct platform_driver da8xx_driver = {
>  	.probe		= da8xx_probe,
>  	.remove		= da8xx_remove,
>  	.driver		= {
>  		.name	= "musb-da8xx",
> +		.of_match_table = of_match_ptr(da8xx_id_table),
>  	},
>  };
>
>

Tested working on LEGO MINDSTORMS EV3 using dr_mode = "peripheral" and 
no vbus-supply.

Tested-By: David Lechner <david@...hnology.com>