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9ec2749bde
Not all clocks are implemented but client drivers can still request them. Currently we will return a NULL pointer to them if the clock isn't implemented in software but NULL pointers are valid clock pointers. Return an error pointer so that driver's don't proceed without a clock they may actually need. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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/export.h>
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#include <linux/regmap.h>
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#include <linux/platform_device.h>
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#include <linux/clk-provider.h>
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#include <linux/reset-controller.h>
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#include "common.h"
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#include "clk-regmap.h"
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#include "reset.h"
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struct qcom_cc {
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struct qcom_reset_controller reset;
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struct clk_onecell_data data;
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struct clk *clks[];
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};
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int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
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{
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void __iomem *base;
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struct resource *res;
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int i, ret;
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struct device *dev = &pdev->dev;
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struct clk *clk;
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struct clk_onecell_data *data;
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struct clk **clks;
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struct regmap *regmap;
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struct qcom_reset_controller *reset;
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struct qcom_cc *cc;
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size_t num_clks = desc->num_clks;
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struct clk_regmap **rclks = desc->clks;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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regmap = devm_regmap_init_mmio(dev, base, desc->config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
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GFP_KERNEL);
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if (!cc)
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return -ENOMEM;
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clks = cc->clks;
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data = &cc->data;
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data->clks = clks;
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data->clk_num = num_clks;
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for (i = 0; i < num_clks; i++) {
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if (!rclks[i]) {
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clks[i] = ERR_PTR(-ENOENT);
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continue;
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}
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clk = devm_clk_register_regmap(dev, rclks[i]);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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clks[i] = clk;
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}
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ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
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if (ret)
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return ret;
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reset = &cc->reset;
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reset->rcdev.of_node = dev->of_node;
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reset->rcdev.ops = &qcom_reset_ops;
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reset->rcdev.owner = dev->driver->owner;
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reset->rcdev.nr_resets = desc->num_resets;
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reset->regmap = regmap;
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reset->reset_map = desc->resets;
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platform_set_drvdata(pdev, &reset->rcdev);
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ret = reset_controller_register(&reset->rcdev);
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if (ret)
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of_clk_del_provider(dev->of_node);
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return ret;
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}
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EXPORT_SYMBOL_GPL(qcom_cc_probe);
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void qcom_cc_remove(struct platform_device *pdev)
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{
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of_clk_del_provider(pdev->dev.of_node);
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reset_controller_unregister(platform_get_drvdata(pdev));
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}
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EXPORT_SYMBOL_GPL(qcom_cc_remove);
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