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Date: Fri, 16 Feb 2024 21:32:15 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Marcel Holtmann <marcel@...tmann.org>,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Kalle Valo <kvalo@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Bartosz Golaszewski <brgl@...ev.pl>,
Saravana Kannan <saravanak@...gle.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Arnd Bergmann <arnd@...db.de>,
Neil Armstrong <neil.armstrong@...aro.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Alex Elder <elder@...aro.org>,
Srini Kandagatla <srinivas.kandagatla@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Abel Vesa <abel.vesa@...aro.org>,
Manivannan Sadhasivam <mani@...nel.org>,
Lukas Wunner <lukas@...ner.de>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: linux-bluetooth@...r.kernel.org,
netdev@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-wireless@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-pci@...r.kernel.org,
linux-pm@...r.kernel.org,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v5 18/18] PCI/pwrctl: add a PCI power control driver for power sequenced devices
From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Add a PCI power control driver that's capable of correctly powering up
devices using the power sequencing subsystem. The first user of this
driver is the ath11k module on QCA6390.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
drivers/pci/pwrctl/Kconfig | 9 +++
drivers/pci/pwrctl/Makefile | 1 +
drivers/pci/pwrctl/pci-pwrctl-pwrseq.c | 84 ++++++++++++++++++++++++++
3 files changed, 94 insertions(+)
create mode 100644 drivers/pci/pwrctl/pci-pwrctl-pwrseq.c
diff --git a/drivers/pci/pwrctl/Kconfig b/drivers/pci/pwrctl/Kconfig
index b91170ebfb49..3880a88aa73b 100644
--- a/drivers/pci/pwrctl/Kconfig
+++ b/drivers/pci/pwrctl/Kconfig
@@ -5,6 +5,15 @@ menu "PCI Power control drivers"
config PCI_PWRCTL
tristate
+config PCI_PWRCTL_PWRSEQ
+ tristate "PCI Power Control driver using the Power Sequencing subsystem"
+ select POWER_SEQUENCING
+ select PCI_PWRCTL
+ default m if (ATH11K_PCI && ARCH_QCOM)
+ help
+ Enable support for the PCI power control driver for device
+ drivers using the Power Sequencing subsystem.
+
config PCI_PWRCTL_WCN7850
tristate "PCI Power Control driver for WCN7850"
select PCI_PWRCTL
diff --git a/drivers/pci/pwrctl/Makefile b/drivers/pci/pwrctl/Makefile
index de20c3af1b78..47ab9db1fb42 100644
--- a/drivers/pci/pwrctl/Makefile
+++ b/drivers/pci/pwrctl/Makefile
@@ -3,4 +3,5 @@
obj-$(CONFIG_PCI_PWRCTL) += pci-pwrctl-core.o
pci-pwrctl-core-y := core.o
+obj-$(CONFIG_PCI_PWRCTL_PWRSEQ) += pci-pwrctl-pwrseq.o
obj-$(CONFIG_PCI_PWRCTL_WCN7850) += pci-pwrctl-wcn7850.o
diff --git a/drivers/pci/pwrctl/pci-pwrctl-pwrseq.c b/drivers/pci/pwrctl/pci-pwrctl-pwrseq.c
new file mode 100644
index 000000000000..43820a727b3f
--- /dev/null
+++ b/drivers/pci/pwrctl/pci-pwrctl-pwrseq.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024 Linaro Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci-pwrctl.h>
+#include <linux/platform_device.h>
+#include <linux/pwrseq/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+struct pci_pwrctl_pwrseq_data {
+ struct pci_pwrctl ctx;
+ struct pwrseq_desc *pwrseq;
+};
+
+static void devm_pci_pwrctl_pwrseq_power_off(void *data)
+{
+ struct pwrseq_desc *pwrseq = data;
+
+ pwrseq_power_off(pwrseq);
+}
+
+static int pci_pwrctl_pwrseq_probe(struct platform_device *pdev)
+{
+ struct pci_pwrctl_pwrseq_data *data;
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->pwrseq = devm_pwrseq_get(dev, of_device_get_match_data(dev));
+ if (IS_ERR(data->pwrseq))
+ return dev_err_probe(dev, PTR_ERR(data->pwrseq),
+ "Failed to get the power sequencer\n");
+
+ ret = pwrseq_power_on(data->pwrseq);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to power-on the device\n");
+
+ ret = devm_add_action_or_reset(dev, devm_pci_pwrctl_pwrseq_power_off,
+ data->pwrseq);
+ if (ret)
+ return ret;
+
+ data->ctx.dev = dev;
+
+ ret = devm_pci_pwrctl_device_set_ready(dev, &data->ctx);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to register the pwrctl wrapper\n");
+
+ return 0;
+}
+
+static const struct of_device_id pci_pwrctl_pwrseq_of_match[] = {
+ {
+ /* ATH11K in QCA6390 package. */
+ .compatible = "pci17cb,1101",
+ .data = "wlan",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pci_pwrctl_pwrseq_of_match);
+
+static struct platform_driver pci_pwrctl_pwrseq_driver = {
+ .driver = {
+ .name = "pci-pwrctl-pwrseq",
+ .of_match_table = pci_pwrctl_pwrseq_of_match,
+ },
+ .probe = pci_pwrctl_pwrseq_probe,
+};
+module_platform_driver(pci_pwrctl_pwrseq_driver);
+
+MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@...aro.org>");
+MODULE_DESCRIPTION("Generic PCI Power Control module for power sequenced devices");
+MODULE_LICENSE("GPL");
--
2.40.1
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