linux-kernel - [PATCH 3/7] phy: exynos5-usbdrd: support isolating HS and SS ports independently

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Message-Id: <20240423-usb-phy-gs101-v1-3-ebdcb3ac174d@linaro.org>
Date: Tue, 23 Apr 2024 18:06:05 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Peter Griffin <peter.griffin@...aro.org>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Alim Akhtar <alim.akhtar@...sung.com>, 
 Sam Protsenko <semen.protsenko@...aro.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, Roy Luo <royluo@...gle.com>, 
 kernel-team@...roid.com, linux-phy@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH 3/7] phy: exynos5-usbdrd: support isolating HS and SS ports
 independently

Some versions of this IP have been integrated using separate PMU power
control registers for the HS and SS parts. One example is the Google
Tensor gs101 SoC.

Such SoCs can now set pmu_offset_usbdrd0_phy_ss in their
exynos5_usbdrd_phy_drvdata for the SS phy to the appropriate value.

The existing 'usbdrdphy' alias can not be used in this case because
that is meant for determining the correct PMU offset if multiple
distinct PHYs exist in the system (as opposed to one PHY with multiple
isolators).

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
 drivers/phy/samsung/phy-exynos5-usbdrd.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index ac208b89f5a6..d69187c22613 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -196,6 +196,7 @@ struct exynos5_usbdrd_phy_drvdata {
 	const struct exynos5_usbdrd_phy_config *phy_cfg;
 	const struct phy_ops *phy_ops;
 	u32 pmu_offset_usbdrd0_phy;
+	u32 pmu_offset_usbdrd0_phy_ss;
 	u32 pmu_offset_usbdrd1_phy;
 	bool has_common_clk_gate;
 };
@@ -1050,16 +1051,6 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
 	if (channel < 0)
 		dev_dbg(dev, "Not a multi-controller usbdrd phy\n");
 
-	switch (channel) {
-	case 1:
-		pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd1_phy;
-		break;
-	case 0:
-	default:
-		pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd0_phy;
-		break;
-	}
-
 	/* Get Vbus regulators */
 	phy_drd->vbus = devm_regulator_get(dev, "vbus");
 	if (IS_ERR(phy_drd->vbus)) {
@@ -1094,6 +1085,19 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
 		phy_drd->phys[i].phy = phy;
 		phy_drd->phys[i].index = i;
 		phy_drd->phys[i].reg_pmu = reg_pmu;
+		switch (channel) {
+		case 1:
+			pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd1_phy;
+			break;
+		case 0:
+		default:
+			pmu_offset = phy_drd->drv_data->pmu_offset_usbdrd0_phy;
+			if (i == EXYNOS5_DRDPHY_PIPE3
+			    && phy_drd->drv_data->pmu_offset_usbdrd0_phy_ss)
+				pmu_offset = phy_drd->drv_data
+						->pmu_offset_usbdrd0_phy_ss;
+			break;
+		}
 		phy_drd->phys[i].pmu_offset = pmu_offset;
 		phy_drd->phys[i].phy_cfg = &drv_data->phy_cfg[i];
 		phy_set_drvdata(phy, &phy_drd->phys[i]);

-- 
2.44.0.769.g3c40516874-goog