tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'reset/arc' into reset/next
Merge the AXS10x driver, which is also merged into
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git for-next
+129
+33
Documentation/devicetree/bindings/reset/snps,axs10x-reset.txt
+33
Documentation/devicetree/bindings/reset/snps,axs10x-reset.txt
···
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Binding for the AXS10x reset controller
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This binding describes the ARC AXS10x boards custom IP-block which allows
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to control reset signals of selected peripherals. For example DW GMAC, etc...
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This block is controlled via memory-mapped register (AKA CREG) which
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represents up-to 32 reset lines.
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As of today only the following lines are used:
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- DW GMAC - line 5
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This binding uses the common reset binding[1].
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[1] Documentation/devicetree/bindings/reset/reset.txt
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Required properties:
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- compatible: should be "snps,axs10x-reset".
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- reg: should always contain pair address - length: for creg reset
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bits register.
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- #reset-cells: from common reset binding; Should always be set to 1.
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Example:
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reset: reset-controller@11220 {
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compatible = "snps,axs10x-reset";
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#reset-cells = <1>;
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reg = <0x11220 0x4>;
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};
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Specifying reset lines connected to IP modules:
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ethernet@.... {
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....
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resets = <&reset 5>;
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....
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};
+6
MAINTAINERS
+6
MAINTAINERS
···
12882
12882
F: arch/arc/boot/dts/ax*
12883
12883
F: Documentation/devicetree/bindings/arc/axs10*
12884
12884
12885
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SYNOPSYS AXS10x RESET CONTROLLER DRIVER
12886
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M: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
12887
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S: Supported
12888
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F: drivers/reset/reset-axs10x.c
12889
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F: Documentation/devicetree/bindings/reset/snps,axs10x-reset.txt
12890
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12885
12891
SYNOPSYS DESIGNWARE DMAC DRIVER
12886
12892
M: Viresh Kumar <vireshk@kernel.org>
12887
12893
M: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+6
drivers/reset/Kconfig
+6
drivers/reset/Kconfig
···
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28
This enables the ATH79 reset controller driver that supports the
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AR71xx SoC reset controller.
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config RESET_AXS10X
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bool "AXS10x Reset Driver" if COMPILE_TEST
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default ARC_PLAT_AXS10X
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help
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This enables the reset controller driver for AXS10x.
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31
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config RESET_BERLIN
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bool "Berlin Reset Driver" if COMPILE_TEST
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default ARCH_BERLIN
+1
drivers/reset/Makefile
+1
drivers/reset/Makefile
···
4
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obj-$(CONFIG_ARCH_TEGRA) += tegra/
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5
obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o
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obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
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obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
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obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
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obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
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obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
+83
drivers/reset/reset-axs10x.c
+83
drivers/reset/reset-axs10x.c
···
1
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/*
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* Copyright (C) 2017 Synopsys.
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*
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* Synopsys AXS10x reset driver.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev)
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#define AXS10X_MAX_RESETS 32
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struct axs10x_rst {
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void __iomem *regs_rst;
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spinlock_t lock;
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struct reset_controller_dev rcdev;
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};
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static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
28
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{
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struct axs10x_rst *rst = to_axs10x_rst(rcdev);
30
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unsigned long flags;
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32
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spin_lock_irqsave(&rst->lock, flags);
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writel(BIT(id), rst->regs_rst);
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spin_unlock_irqrestore(&rst->lock, flags);
35
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return 0;
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}
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static const struct reset_control_ops axs10x_reset_ops = {
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.reset = axs10x_reset_reset,
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};
42
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static int axs10x_reset_probe(struct platform_device *pdev)
44
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{
45
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struct axs10x_rst *rst;
46
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struct resource *mem;
47
+
48
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rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
49
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if (!rst)
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return -ENOMEM;
51
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
54
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if (IS_ERR(rst->regs_rst))
55
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return PTR_ERR(rst->regs_rst);
56
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57
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spin_lock_init(&rst->lock);
58
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rst->rcdev.owner = THIS_MODULE;
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rst->rcdev.ops = &axs10x_reset_ops;
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rst->rcdev.of_node = pdev->dev.of_node;
62
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rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
63
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64
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return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
65
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}
66
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static const struct of_device_id axs10x_reset_dt_match[] = {
68
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{ .compatible = "snps,axs10x-reset" },
69
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{ },
70
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};
71
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72
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static struct platform_driver axs10x_reset_driver = {
73
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.probe = axs10x_reset_probe,
74
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.driver = {
75
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.name = "axs10x-reset",
76
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.of_match_table = axs10x_reset_dt_match,
77
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},
78
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};
79
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builtin_platform_driver(axs10x_reset_driver);
80
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81
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MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
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MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
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MODULE_LICENSE("GPL v2");