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Date: Fri, 10 Apr 2020 19:18:11 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Wesley Cheng <wcheng@...eaurora.org>, agross@...nel.org,
bjorn.andersson@...aro.org, mark.rutland@....com,
mturquette@...libre.com, robh+dt@...nel.org
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
vinod.koul@...aro.org, Wesley Cheng <wcheng@...eaurora.org>
Subject: Re: [PATCH v3 2/4] phy: qcom-snps: Add SNPS USB PHY driver for QCOM based SOCs
Quoting Wesley Cheng (2020-04-07 15:23:27)
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index e46824d..3158c14 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -85,6 +85,16 @@ config PHY_QCOM_USB_HS
> Support for the USB high-speed ULPI compliant phy on Qualcomm
> chipsets.
>
> +config PHY_QCOM_USB_SNPS_HS_7NM
> + tristate "Qualcomm 7nm USB HS PHY module"
> + depends on OF && (ARCH_QCOM || COMPILE_TEST)
> + select GENERIC_PHY
> + help
> + Enable support for the USB high-speed SNPS phy on Qualcomm 7nm
> + chipsets. This PHY has differences in the register map compared
> + to the 28nm variant. The PHY is paired with a Synopsys DWC3 USB
> + controller on MSM SOCs.
s/MSM/Qualcomm/?
> +
> config PHY_QCOM_USB_HSIC
> tristate "Qualcomm USB HSIC ULPI PHY module"
> depends on USB_ULPI_BUS
> diff --git a/drivers/phy/qualcomm/phy-qcom-snps-7nm.c b/drivers/phy/qualcomm/phy-qcom-snps-7nm.c
> new file mode 100644
> index 0000000..00a46cd
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-snps-7nm.c
> @@ -0,0 +1,294 @@
[...]
> +
> +/**
> + * struct qcom_snps_hsphy - structure holding snps hs phy attributes
snps hs phy attributes
structure and holding are redundant.
> + *
> + * @phy: generic phy
> + * @base: iomapped memory space for qubs2 phy
> + *
> + * @cfg_ahb_clk: AHB2PHY interface clock
> + * @ref_clk: phy reference clock
> + * @iface_clk: phy interface clock
> + * @phy_reset: phy reset control
> + * @vregs: regulator supplies bulk data
> +
> + * @phy_initialized: if PHY has been initialized correctly
Please drop space between members in the kernel-doc.
> + *
> + */
> +struct qcom_snps_hsphy {
> + struct phy *phy;
> + void __iomem *base;
> +
> + struct clk *cfg_ahb_clk;
> + struct clk *ref_clk;
> + struct reset_control *phy_reset;
> + struct regulator_bulk_data vregs[SNPS_HS_NUM_VREGS];
> +
> + bool phy_initialized;
> +};
> +
> +static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset,
> + u32 mask, u32 val)
> +{
> + u32 reg;
> +
> + reg = readl(base + offset);
> + reg &= ~mask;
> + reg |= val & mask;
> + writel(reg, base + offset);
Make these relaxed?
> +
> + /* Ensure above write is completed */
> + readl(base + offset);
And this one too?
> +}
> +
> +static int qcom_snps_hsphy_init(struct phy *phy)
> +{
> + struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy);
> + int ret;
> +
> + dev_vdbg(&phy->dev, "%s(): Initializing SNPS HS phy\n", __func__);
> +
> + /* turn on regulator supplies */
These comments don't tell us anything besides what the code is doing so
they don't seem useful.
> + ret = regulator_bulk_enable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + if (ret)
> + return ret;
> +
> + /* enable ahb interface clock to program phy */
> + ret = clk_prepare_enable(hsphy->cfg_ahb_clk);
> + if (ret) {
> + dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
> + goto poweroff_phy;
> + }
> +
> + /* Perform phy reset */
> + ret = reset_control_assert(hsphy->phy_reset);
> + if (ret) {
> + dev_err(&phy->dev, "failed to assert phy_reset, %d\n", ret);
> + goto disable_ahb_clk;
> + }
> +
> + /* 100 us delay to keep PHY in reset mode */
> + usleep_range(100, 150);
> +
> + ret = reset_control_deassert(hsphy->phy_reset);
> + if (ret) {
> + dev_err(&phy->dev, "failed to de-assert phy_reset, %d\n", ret);
> + goto disable_ahb_clk;
> + }
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_CFG0,
> + UTMI_PHY_CMN_CTRL_OVERRIDE_EN,
> + UTMI_PHY_CMN_CTRL_OVERRIDE_EN);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_UTMI_CTRL5,
> + POR, POR);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON0,
> + FSEL_MASK, 0);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON1,
> + PLLBTUNE, PLLBTUNE);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_REFCLK_CTRL,
> + REFCLK_SEL_DEFAULT, REFCLK_SEL_MASK);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON1,
> + VBUSVLDEXTSEL0, VBUSVLDEXTSEL0);
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL1,
> + VBUSVLDEXT0, VBUSVLDEXT0);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON2,
> + VREGBYPASS, VREGBYPASS);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL2,
> + USB2_SUSPEND_N_SEL | USB2_SUSPEND_N,
> + USB2_SUSPEND_N_SEL | USB2_SUSPEND_N);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_UTMI_CTRL0,
> + SLEEPM, SLEEPM);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_UTMI_CTRL5,
> + POR, 0);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL2,
> + USB2_SUSPEND_N_SEL, 0);
> +
> + qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_CFG0,
> + UTMI_PHY_CMN_CTRL_OVERRIDE_EN, 0);
> +
> + hsphy->phy_initialized = true;
> +
> + return 0;
> +
> +disable_ahb_clk:
> + clk_disable_unprepare(hsphy->cfg_ahb_clk);
> +poweroff_phy:
> + regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> +
> + return ret;
> +}
> +
> +static int qcom_snps_hsphy_exit(struct phy *phy)
> +{
> + struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy);
> +
> + reset_control_assert(hsphy->phy_reset);
> + clk_disable_unprepare(hsphy->cfg_ahb_clk);
> + regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + hsphy->phy_initialized = false;
> +
> + return 0;
> +}
> +
> +static const struct phy_ops qcom_snps_hsphy_gen_ops = {
> + .init = qcom_snps_hsphy_init,
> + .exit = qcom_snps_hsphy_exit,
> + .owner = THIS_MODULE,
> +};
> +
> +static const struct of_device_id qcom_snps_hsphy_of_match_table[] = {
> + {
> + .compatible = "qcom,sm8150-usb-hs-phy",
> + },
> + {
> + .compatible = "qcom,usb-snps-hs-7nm-phy",
> + },
> + { },
Can this be on one line?
{ .compatible = "qcom,sm8150-usb-hs-phy", },
{ .compatible = "qcom,usb-snps-hs-7nm-phy", },
{ }
Also drop comma on the last element so nothing can follow without
causing compile error.
> +};
> +MODULE_DEVICE_TABLE(of, qcom_snps_hsphy_of_match_table);
> +
> +static int qcom_snps_hsphy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct qcom_snps_hsphy *hsphy;
> + struct phy_provider *phy_provider;
> + struct phy *generic_phy;
> + struct resource *res;
> + int ret, i;
> + int num;
> +
> + hsphy = devm_kzalloc(dev, sizeof(*hsphy), GFP_KERNEL);
> + if (!hsphy)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + hsphy->base = devm_ioremap_resource(dev, res);
devm_platform_ioremap_resource()?
> + if (IS_ERR(hsphy->base))
> + return PTR_ERR(hsphy->base);
> +
> + hsphy->ref_clk = devm_clk_get(dev, "ref");
> + if (IS_ERR(hsphy->ref_clk)) {
> + ret = PTR_ERR(hsphy->ref_clk);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to get ref clk, %d\n", ret);
> + return ret;
> + }
> +
> + hsphy->phy_reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> + if (IS_ERR(hsphy->phy_reset)) {
> + dev_err(dev, "failed to get phy core reset\n");
> + return PTR_ERR(hsphy->phy_reset);
> + }
> +
> + num = ARRAY_SIZE(hsphy->vregs);
> + for (i = 0; i < num; i++)
> + hsphy->vregs[i].supply = qcom_snps_hsphy_vreg_names[i];
> +
> + ret = devm_regulator_bulk_get(dev, num, hsphy->vregs);
> + if (ret) {
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to get regulator supplies: %d\n",
> + ret);
> + return ret;
> + }
> +
> + generic_phy = devm_phy_create(dev, NULL, &qcom_snps_hsphy_gen_ops);
> + if (IS_ERR(generic_phy)) {
> + ret = PTR_ERR(generic_phy);
> + dev_err(dev, "failed to create phy, %d\n", ret);
> + return ret;
> + }
> + hsphy->phy = generic_phy;
> +
> + dev_set_drvdata(dev, hsphy);
> + phy_set_drvdata(generic_phy, hsphy);
> +
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> + if (!IS_ERR(phy_provider))
> + dev_info(dev, "Registered Qcom-SNPS HS phy\n");
dev_dbg()? Or just remove it?
> +
> + return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static struct platform_driver qcom_snps_hsphy_driver = {
> + .probe = qcom_snps_hsphy_probe,
> + .driver = {
> + .name = "qcom-snps-hs-7nm-phy",
> + .of_match_table = qcom_snps_hsphy_of_match_table,
> + },
> +};
> +
> +module_platform_driver(qcom_snps_hsphy_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm 7nm USB HS PHY driver");
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