linux-kernel - Re: [PATCH v4 2/2] usb: phy: Add USB3 PHY support for Intel LGM SoC

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Date:   Wed, 17 Jun 2020 11:23:07 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>,
        linux-kernel@...r.kernel.org, balbi@...nel.org, robh@...nel.org
Cc:     gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com, yin1.li@...el.com,
        andriy.shevchenko@...el.com
Subject: Re: [PATCH v4 2/2] usb: phy: Add USB3 PHY support for Intel LGM SoC

Hi Vadivel,

On Wed, 2020-06-17 at 11:58 +0800, Ramuthevar,Vadivel MuruganX wrote:
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> 
> Add support for USB PHY on Intel LGM SoC.
> 
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> ---
>  drivers/usb/phy/Kconfig       |  11 ++
>  drivers/usb/phy/Makefile      |   1 +
>  drivers/usb/phy/phy-lgm-usb.c | 275 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 287 insertions(+)
>  create mode 100644 drivers/usb/phy/phy-lgm-usb.c
> 
[...]
> diff --git a/drivers/usb/phy/phy-lgm-usb.c b/drivers/usb/phy/phy-lgm-usb.c
> new file mode 100644
> index 000000000000..3da772dfd736
> --- /dev/null
> +++ b/drivers/usb/phy/phy-lgm-usb.c
> @@ -0,0 +1,275 @@
[...]
> +	for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++) {
> +		resets[i] = devm_reset_control_get_exclusive(dev, CTL_RESETS[i]);
> +		if (IS_ERR(resets[i])) {
> +			dev_err(dev, "%s reset not found\n", CTL_RESETS[i]);
> +			return PTR_ERR(resets[i]);
> +		}
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++) {
> +		ta->resets[i] = devm_reset_control_get_exclusive(dev, PHY_RESETS[i]);
> +		if (IS_ERR(ta->resets[i])) {
> +			dev_err(dev, "%s reset not found\n", PHY_RESETS[i]);
> +			return PTR_ERR(ta->resets[i]);
> +		}
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++)
> +		reset_control_assert(resets[i]);
> +
> +	for (i = 0; i < ARRAY_SIZE(PHY_RESETS); i++)
> +		reset_control_assert(ta->resets[i]);
> +	/*
> +	 * Out-of-band reset of the controller after PHY reset will cause
> +	 * controller malfunctioning, so we should use in-band controller
> +	 * reset only and leave the controller de-asserted here.
> +	 */
> +	for (i = 0; i < ARRAY_SIZE(CTL_RESETS); i++)
> +		reset_control_deassert(resets[i]);

This driver could probably benefit from a reset_bulk API similar to the
clk_bulk and regulator_bulk APIs, but that doesn't exist yet.

For the reset handling in this driver,

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp