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Message-Id: <20250822135816.739582-4-marcos@orca.pet>
Date: Fri, 22 Aug 2025 15:58:13 +0200
From: Marcos Del Sol Vives <marcos@...a.pet>
To: linux-kernel@...r.kernel.org
Cc: Marcos Del Sol Vives <marcos@...a.pet>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Michael Walle <mwalle@...nel.org>,
Lee Jones <lee@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-gpio@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: [PATCH v4 3/3] mfd: vortex: implement new driver for Vortex southbridges
This new driver loads resources related to southbridges available in DM&P
Vortex devices, currently only the GPIO pins.
Signed-off-by: Marcos Del Sol Vives <marcos@...a.pet>
---
MAINTAINERS | 1 +
drivers/mfd/Kconfig | 9 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/vortex-sb.c | 135 ++++++++++++++++++++++++++++++++++++++++
include/linux/pci_ids.h | 3 +
5 files changed, 149 insertions(+)
create mode 100644 drivers/mfd/vortex-sb.c
diff --git a/MAINTAINERS b/MAINTAINERS
index afa88f446630..63e410e23e95 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26957,6 +26957,7 @@ VORTEX HARDWARE SUPPORT
R: Marcos Del Sol Vives <marcos@...a.pet>
S: Maintained
F: drivers/gpio/gpio-vortex.c
+F: drivers/mfd/vortex-sb.c
VRF
M: David Ahern <dsahern@...nel.org>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 425c5fba6cb1..fe54bb22687d 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2008,6 +2008,15 @@ config MFD_VX855
VIA VX855/VX875 south bridge. You will need to enable the vx855_spi
and/or vx855_gpio drivers for this to do anything useful.
+config MFD_VORTEX_SB
+ tristate "Vortex southbridge"
+ select MFD_CORE
+ depends on PCI
+ help
+ Say yes here if you want to have support for the southbridge
+ present on Vortex SoCs. You will need to enable the vortex-gpio
+ driver for this to do anything useful.
+
config MFD_ARIZONA
select REGMAP
select REGMAP_IRQ
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f7bdedd5a66d..2504ba311f1a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -202,6 +202,7 @@ obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
obj-$(CONFIG_MFD_VX855) += vx855.o
obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
+obj-$(CONFIG_MFD_VORTEX_SB) += vortex-sb.o
si476x-core-y := si476x-cmd.o si476x-prop.o si476x-i2c.o
obj-$(CONFIG_MFD_SI476X_CORE) += si476x-core.o
diff --git a/drivers/mfd/vortex-sb.c b/drivers/mfd/vortex-sb.c
new file mode 100644
index 000000000000..141fa19773e2
--- /dev/null
+++ b/drivers/mfd/vortex-sb.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MFD southbridge driver for Vortex SoCs
+ *
+ * Author: Marcos Del Sol Vives <marcos@...a.pet>
+ *
+ * Based on the RDC321x MFD driver by Florian Fainelli and Bernhard Loos
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/pci.h>
+#include <linux/mfd/core.h>
+
+struct vortex_southbridge {
+ const struct mfd_cell *cells;
+ int n_cells;
+};
+
+/* Layout for Vortex86DX/MX */
+static const struct resource vortex_dx_gpio_resources[] = {
+ {
+ .name = "dat1",
+ .start = 0x78,
+ .end = 0x7C,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "dir1",
+ .start = 0x98,
+ .end = 0x9C,
+ .flags = IORESOURCE_IO,
+ }
+};
+
+static const struct mfd_cell vortex_dx_sb_cells[] = {
+ {
+ .name = "vortex-gpio",
+ .resources = vortex_dx_gpio_resources,
+ .num_resources = ARRAY_SIZE(vortex_dx_gpio_resources),
+ },
+};
+
+static const struct vortex_southbridge vortex_dx_sb = {
+ .cells = vortex_dx_sb_cells,
+ .n_cells = ARRAY_SIZE(vortex_dx_sb_cells),
+};
+
+/* Layout for Vortex86DX2/DX3 */
+static const struct resource vortex_dx2_gpio_resources[] = {
+ {
+ .name = "dat1",
+ .start = 0x78,
+ .end = 0x7C,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "dat2",
+ .start = 0x100,
+ .end = 0x105,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "dir1",
+ .start = 0x98,
+ .end = 0x9D,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "dir2",
+ .start = 0x93,
+ .end = 0x97,
+ .flags = IORESOURCE_IO,
+ }
+};
+
+static const struct mfd_cell vortex_dx2_sb_cells[] = {
+ {
+ .name = "vortex-gpio",
+ .resources = vortex_dx2_gpio_resources,
+ .num_resources = ARRAY_SIZE(vortex_dx2_gpio_resources),
+ },
+};
+
+static const struct vortex_southbridge vortex_dx2_sb = {
+ .cells = vortex_dx2_sb_cells,
+ .n_cells = ARRAY_SIZE(vortex_dx2_sb_cells),
+};
+
+static int vortex_sb_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct vortex_southbridge *priv = (struct vortex_southbridge *) ent->driver_data;
+ int err;
+
+ /*
+ * In the Vortex86DX3, the southbridge appears twice (on both 00:07.0
+ * and 00:07.1). Register only once for .0.
+ *
+ * Other Vortex boards (eg Vortex86MX+) have the southbridge exposed
+ * only once, also at 00:07.0.
+ */
+ if (PCI_FUNC(pdev->devfn) != 0)
+ return -ENODEV;
+
+ err = pci_enable_device(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable device\n");
+ return err;
+ }
+
+ return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+ priv->cells, priv->n_cells,
+ NULL, 0, NULL);
+}
+
+static const struct pci_device_id vortex_sb_table[] = {
+ /* Vortex86DX */
+ { PCI_DEVICE_DATA(RDC, R6031, &vortex_dx_sb) },
+ /* Vortex86DX2/DX3 */
+ { PCI_DEVICE_DATA(RDC, R6035, &vortex_dx2_sb) },
+ /* Vortex86MX */
+ { PCI_DEVICE_DATA(RDC, R6036, &vortex_dx_sb) },
+ {}
+};
+MODULE_DEVICE_TABLE(pci, vortex_sb_table);
+
+static struct pci_driver vortex_sb_driver = {
+ .name = "vortex-sb",
+ .id_table = vortex_sb_table,
+ .probe = vortex_sb_probe,
+};
+
+module_pci_driver(vortex_sb_driver);
+
+MODULE_AUTHOR("Marcos Del Sol Vives <marcos@...a.pet>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Vortex MFD southbridge driver");
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 92ffc4373f6d..2c7afebd94ea 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2412,6 +2412,9 @@
#define PCI_VENDOR_ID_RDC 0x17f3
#define PCI_DEVICE_ID_RDC_R6020 0x6020
#define PCI_DEVICE_ID_RDC_R6030 0x6030
+#define PCI_DEVICE_ID_RDC_R6031 0x6031
+#define PCI_DEVICE_ID_RDC_R6035 0x6035
+#define PCI_DEVICE_ID_RDC_R6036 0x6036
#define PCI_DEVICE_ID_RDC_R6040 0x6040
#define PCI_DEVICE_ID_RDC_R6060 0x6060
#define PCI_DEVICE_ID_RDC_R6061 0x6061
--
2.34.1
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