[RFC PATCH 14/15] WIP: PCI: qcom: use pwrseq to power up bus devices

[Dmitry Baryshkov]

Use bus-pwrseq device tree node to power up the devices on the bus. This
is to be rewritten with the proper code parsing the device tree and
powering up individual devices.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++
 drivers/power/pwrseq/pwrseq_qca.c      |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8a7a300163e5..a60d41fbcd6f 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -23,6 +23,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
+#include <linux/pwrseq/consumer.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
@@ -1467,6 +1468,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	struct pcie_port *pp;
 	struct dw_pcie *pci;
 	struct qcom_pcie *pcie;
+	struct pwrseq *pwrseq;
 	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
@@ -1520,6 +1522,17 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	pp->ops = &qcom_pcie_dw_ops;
 
+	pwrseq = devm_pwrseq_get_optional(dev, "bus");
+	if (IS_ERR(pwrseq)) {
+		ret = PTR_ERR(pwrseq);
+		goto err_pm_runtime_put;
+	}
+	if (pwrseq) {
+		ret = pwrseq_full_power_on(pwrseq);
+		if (ret)
+			goto err_pm_runtime_put;
+	}
+
 	ret = phy_init(pcie->phy);
 	if (ret) {
 		pm_runtime_disable(&pdev->dev);
diff --git a/drivers/power/pwrseq/pwrseq_qca.c b/drivers/power/pwrseq/pwrseq_qca.c
index 3421a4821126..4107f0a9c05d 100644
--- a/drivers/power/pwrseq/pwrseq_qca.c
+++ b/drivers/power/pwrseq/pwrseq_qca.c
@@ -1,3 +1,4 @@
+#define DEBUG
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2021, Linaro Ltd.
-- 
2.30.2