linux-kernel - Re: [PATCH v6 1/3] phy: add driver for Qualcomm IPQ40xx USB PHY

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Date:   Mon, 27 Apr 2020 22:15:14 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, John Crispin <john@...ozen.org>,
        Luka Perkov <luka.perkov@...tura.hr>
Subject: Re: [PATCH v6 1/3] phy: add driver for Qualcomm IPQ40xx USB PHY

Hello Robert,

On 01-04-20, 18:35, Robert Marko wrote:

> +static int ipq4019_ss_phy_power_on(struct phy *_phy)
> +{
> +	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
> +
> +	ipq4019_ss_phy_power_off(_phy);
> +
> +	reset_control_deassert(phy->por_rst);
> +
> +	return 0;
> +}
> +
> +static struct phy_ops ipq4019_usb_ss_phy_ops = {
> +	.power_on	= ipq4019_ss_phy_power_on,
> +	.power_off	= ipq4019_ss_phy_power_off,
> +};
> +
> +static int ipq4019_hs_phy_power_off(struct phy *_phy)
> +{
> +	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
> +
> +	reset_control_assert(phy->por_rst);
> +	msleep(10);

why not call ipq4019_ss_phy_power_off() here as well?

> +
> +	reset_control_assert(phy->srif_rst);
> +	msleep(10);
> +
> +	return 0;
> +}
> +
> +static int ipq4019_hs_phy_power_on(struct phy *_phy)
> +{
> +	struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
> +
> +	ipq4019_hs_phy_power_off(_phy);
> +
> +	reset_control_deassert(phy->srif_rst);
> +	msleep(10);
> +
> +	reset_control_deassert(phy->por_rst);
> +
> +	return 0;
> +}
> +
> +static struct phy_ops ipq4019_usb_hs_phy_ops = {
> +	.power_on	= ipq4019_hs_phy_power_on,
> +	.power_off	= ipq4019_hs_phy_power_off,
> +};

So this is fiddling with resets, what about phy configuration and
calibration, who take care of that?

> +static int ipq4019_usb_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct phy_provider *phy_provider;
> +	struct ipq4019_usb_phy *phy;
> +	const struct of_device_id *match;
> +
> +	match = of_match_device(ipq4019_usb_phy_of_match, &pdev->dev);
> +	if (!match)
> +		return -ENODEV;

you are using this to get match-data few lines below, why not use
of_device_get_match_data() and get the match->data which you are
interested in?

-- 
~Vinod