[PATCH v8 5/9] mfd: Add driver for NVIDIA Tegra XUSB
From: Lee Jones <hidden>
Date: 2015-05-13 14:37:25
Also in:
linux-devicetree, linux-tegra, lkml
On Mon, 04 May 2015, Andrew Bresticker wrote:
Add an MFD driver for the XUSB host complex found on NVIDIA Tegra124 and later SoCs.
What else does it do besides USB?
quoted hunk ↗ jump to hunk
Signed-off-by: Andrew Bresticker <redacted> Cc: Samuel Ortiz <redacted> Cc: Lee Jones <redacted> --- Changes from v7: - Have child nodes get non-shared memory and interrupts from DT. - Use of_platform_populate rather than mfd_add_devices. - Get rid of struct tegra_xusb. New for v7. --- drivers/mfd/Kconfig | 7 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/tegra-xusb.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 83 insertions(+) create mode 100644 drivers/mfd/tegra-xusb.cdiff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index d5ad04d..61872b4 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig@@ -1430,6 +1430,13 @@ config MFD_STW481X in various ST Microelectronics and ST-Ericsson embedded Nomadik series. +config MFD_TEGRA_XUSB + tristate "NVIDIA Tegra XUSB" + depends on ARCH_TEGRA + select MFD_CORE + help + Support for the XUSB complex found on NVIDIA Tegra124 and later SoCs. + menu "Multimedia Capabilities Port drivers" depends on ARCH_SA1100diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 0e5cfeb..7588caf 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile@@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o obj-$(CONFIG_MFD_DLN2) += dln2.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o +obj-$(CONFIG_MFD_TEGRA_XUSB) += tegra-xusb.o intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.odiff --git a/drivers/mfd/tegra-xusb.c b/drivers/mfd/tegra-xusb.c new file mode 100644 index 0000000..e11fa23 --- /dev/null +++ b/drivers/mfd/tegra-xusb.c@@ -0,0 +1,75 @@ +/* + * NVIDIA Tegra XUSB MFD driver + * + * Copyright (C) 2015 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +static const struct of_device_id tegra_xusb_of_match[] = { + { .compatible = "nvidia,tegra124-xusb", }, + {}, +}; +MODULE_DEVICE_TABLE(of, tegra_xusb_of_match);
If you're not using this to patch on, I'd prefer you place it next to where it's first used i.e. down at the bottom of the file.
+static struct regmap_config tegra_fpci_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
+static int tegra_xusb_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct regmap *fpci_regs;
+ void __iomem *fpci_base;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ fpci_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(fpci_base))
+ return PTR_ERR(fpci_base);
+
+ tegra_fpci_regmap_config.max_register = res->end - res->start - 3;
+ fpci_regs = devm_regmap_init_mmio(&pdev->dev, fpci_base,
+ &tegra_fpci_regmap_config);
+ if (IS_ERR(fpci_regs)) {
+ ret = PTR_ERR(fpci_regs);
+ dev_err(&pdev->dev, "Failed to init regmap: %d\n", ret);
+ return ret;
+ }
+ platform_set_drvdata(pdev, fpci_regs);
+
+ ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add sub-devices: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct platform_driver tegra_xusb_driver = {
+ .probe = tegra_xusb_probe,No .remove()?
+ .driver = {
+ .name = "tegra-xusb",
+ .of_match_table = tegra_xusb_of_match,
+ },
+};
+module_platform_driver(tegra_xusb_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra XUSB MFD");
+MODULE_AUTHOR("Andrew Bresticker [off-list ref]");
+MODULE_LICENSE("GPL v2");-- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog