tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'clk-bcm2835' into clk-next
+134
+31
Documentation/devicetree/bindings/clock/brcm,bcm2835-aux-clock.txt
+31
Documentation/devicetree/bindings/clock/brcm,bcm2835-aux-clock.txt
···
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Broadcom BCM2835 auxiliary peripheral support
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This binding uses the common clock binding:
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Documentation/devicetree/bindings/clock/clock-bindings.txt
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The auxiliary peripherals (UART, SPI1, and SPI2) have a small register
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area controlling clock gating to the peripherals, and providing an IRQ
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status register.
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Required properties:
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- compatible: Should be "brcm,bcm2835-aux"
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- #clock-cells: Should be <1>. The permitted clock-specifier values can be
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found in include/dt-bindings/clock/bcm2835-aux.h
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- reg: Specifies base physical address and size of the registers
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- clocks: The parent clock phandle
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Example:
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clocks: cprman@7e101000 {
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compatible = "brcm,bcm2835-cprman";
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#clock-cells = <1>;
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reg = <0x7e101000 0x2000>;
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clocks = <&clk_osc>;
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};
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aux: aux@0x7e215004 {
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compatible = "brcm,bcm2835-aux";
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#clock-cells = <1>;
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reg = <0x7e215000 0x8>;
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clocks = <&clocks BCM2835_CLOCK_VPU>;
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};
+1
drivers/clk/bcm/Makefile
+1
drivers/clk/bcm/Makefile
···
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obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm21664.o
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obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o
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obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o
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obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835-aux.o
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obj-$(CONFIG_COMMON_CLK_IPROC) += clk-ns2.o
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obj-$(CONFIG_ARCH_BCM_CYGNUS) += clk-cygnus.o
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obj-$(CONFIG_ARCH_BCM_NSP) += clk-nsp.o
+85
drivers/clk/bcm/clk-bcm2835-aux.c
+85
drivers/clk/bcm/clk-bcm2835-aux.c
···
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/*
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* Copyright (C) 2015 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clk/bcm2835.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <dt-bindings/clock/bcm2835-aux.h>
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#define BCM2835_AUXIRQ 0x00
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#define BCM2835_AUXENB 0x04
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static int bcm2835_aux_clk_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct clk_onecell_data *onecell;
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const char *parent;
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struct clk *parent_clk;
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struct resource *res;
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void __iomem *reg, *gate;
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parent_clk = devm_clk_get(dev, NULL);
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if (IS_ERR(parent_clk))
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return PTR_ERR(parent_clk);
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parent = __clk_get_name(parent_clk);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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reg = devm_ioremap_resource(dev, res);
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if (!reg)
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return -ENODEV;
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onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL);
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if (!onecell)
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return -ENOMEM;
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onecell->clk_num = BCM2835_AUX_CLOCK_COUNT;
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onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT,
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sizeof(*onecell->clks), GFP_KERNEL);
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if (!onecell->clks)
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return -ENOMEM;
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gate = reg + BCM2835_AUXENB;
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onecell->clks[BCM2835_AUX_CLOCK_UART] =
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clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
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onecell->clks[BCM2835_AUX_CLOCK_SPI1] =
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clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
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onecell->clks[BCM2835_AUX_CLOCK_SPI2] =
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clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
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of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell);
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return 0;
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}
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static const struct of_device_id bcm2835_aux_clk_of_match[] = {
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{ .compatible = "brcm,bcm2835-aux", },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
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static struct platform_driver bcm2835_aux_clk_driver = {
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.driver = {
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.name = "bcm2835-aux-clk",
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.of_match_table = bcm2835_aux_clk_of_match,
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},
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.probe = bcm2835_aux_clk_probe,
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};
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builtin_platform_driver(bcm2835_aux_clk_driver);
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
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MODULE_LICENSE("GPL v2");
+17
include/dt-bindings/clock/bcm2835-aux.h
+17
include/dt-bindings/clock/bcm2835-aux.h
···
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/*
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* Copyright (C) 2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define BCM2835_AUX_CLOCK_UART 0
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#define BCM2835_AUX_CLOCK_SPI1 1
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#define BCM2835_AUX_CLOCK_SPI2 2
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#define BCM2835_AUX_CLOCK_COUNT 3