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3ddc3564d3
The ACC and GCC regions present in KPSSv1 contain registers to control clocks and power to each Krait CPU and L2. For CPUfreq purposes probe these devices and expose a mux clock that chooses between PXO and PLL8. Cc: <devicetree@vger.kernel.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Sricharan R <sricharan@codeaurora.org> Tested-by: Craig Tatlor <ctatlor97@gmail.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018, The Linux Foundation. All rights reserved.
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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static const char *aux_parents[] = {
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"pll8_vote",
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"pxo",
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};
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static unsigned int aux_parent_map[] = {
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3,
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0,
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};
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static const struct of_device_id kpss_xcc_match_table[] = {
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{ .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
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{ .compatible = "qcom,kpss-gcc" },
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{}
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};
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MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
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static int kpss_xcc_driver_probe(struct platform_device *pdev)
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{
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const struct of_device_id *id;
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struct clk *clk;
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struct resource *res;
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void __iomem *base;
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const char *name;
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id = of_match_device(kpss_xcc_match_table, &pdev->dev);
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if (!id)
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return -ENODEV;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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if (id->data) {
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if (of_property_read_string_index(pdev->dev.of_node,
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"clock-output-names",
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0, &name))
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return -ENODEV;
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base += 0x14;
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} else {
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name = "acpu_l2_aux";
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base += 0x28;
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}
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clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
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ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
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0, aux_parent_map, NULL);
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platform_set_drvdata(pdev, clk);
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return PTR_ERR_OR_ZERO(clk);
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}
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static int kpss_xcc_driver_remove(struct platform_device *pdev)
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{
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clk_unregister_mux(platform_get_drvdata(pdev));
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return 0;
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}
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static struct platform_driver kpss_xcc_driver = {
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.probe = kpss_xcc_driver_probe,
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.remove = kpss_xcc_driver_remove,
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.driver = {
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.name = "kpss-xcc",
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.of_match_table = kpss_xcc_match_table,
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},
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};
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module_platform_driver(kpss_xcc_driver);
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MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:kpss-xcc");
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