linux-kernel - [PATCH] mfd: Add Simple PCI MFD driver

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Date:   Mon, 23 Jan 2023 15:32:31 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Lee Jones <lee@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <kernel@...s.com>
Subject: [PATCH] mfd: Add Simple PCI MFD driver

Add a PCI driver which registers all child nodes specified in the
devicetree.  It will allow platform devices to be used on virtual
systems which already support PCI and devicetree, such as UML with
virt-pci.

The driver has no id_table by default; user space needs to provide one
using the new_id mechanism in sysfs.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 drivers/mfd/Kconfig          | 11 +++++++++++
 drivers/mfd/Makefile         |  1 +
 drivers/mfd/simple-mfd-pci.c | 21 +++++++++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 30db49f31866..1e325334e9ae 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1277,6 +1277,17 @@ config MFD_SIMPLE_MFD_I2C
 	  sub-devices represented by child nodes in Device Tree will be
 	  subsequently registered.
 
+config MFD_SIMPLE_MFD_PCI
+	tristate "Simple Multi-Functional Device support (PCI)"
+	depends on PCI
+	depends on OF || COMPILE_TEST
+	help
+	  This enables support for a PCI driver for which any sub-devices
+	  represented by child nodes in the devicetree will be registered.
+
+	  The driver does not bind to any devices by default; that should
+	  be done via sysfs using new_id.
+
 config MFD_SL28CPLD
 	tristate "Kontron sl28cpld Board Management Controller"
 	depends on I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 457471478a93..7ae329039a13 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -268,6 +268,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008)	+= qcom-pm8008.o
 
 obj-$(CONFIG_SGI_MFD_IOC3)	+= ioc3.o
 obj-$(CONFIG_MFD_SIMPLE_MFD_I2C)	+= simple-mfd-i2c.o
+obj-$(CONFIG_MFD_SIMPLE_MFD_PCI)	+= simple-mfd-pci.o
 obj-$(CONFIG_MFD_SMPRO)		+= smpro-core.o
 obj-$(CONFIG_MFD_INTEL_M10_BMC)   += intel-m10-bmc.o
 
diff --git a/drivers/mfd/simple-mfd-pci.c b/drivers/mfd/simple-mfd-pci.c
new file mode 100644
index 000000000000..c5b2540e924a
--- /dev/null
+++ b/drivers/mfd/simple-mfd-pci.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+
+static int simple_mfd_pci_probe(struct pci_dev *pdev,
+				const struct pci_device_id *id)
+{
+	return devm_of_platform_populate(&pdev->dev);
+}
+
+static struct pci_driver simple_mfd_pci_driver = {
+	/* No id_table, use new_id in sysfs */
+	.name = "simple-mfd-pci",
+	.probe = simple_mfd_pci_probe,
+};
+
+module_pci_driver(simple_mfd_pci_driver);
+
+MODULE_LICENSE("GPL");

---
base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2
change-id: 20230120-simple-mfd-pci-54f0d9b90dfc

Best regards,
-- 
Vincent Whitchurch <vincent.whitchurch@...s.com>