1 // SPDX-License-Identifier: GPL-2.0-only
6  * Clock driver for Exynos clock output
11 #include <linux/clk-provider.h>
20 #define DRV_NAME			"exynos-clkout"
55 		.compatible = "samsung,exynos3250-pmu",
58 		.compatible = "samsung,exynos4210-pmu",
61 		.compatible = "samsung,exynos4212-pmu",
64 		.compatible = "samsung,exynos4412-pmu",
67 		.compatible = "samsung,exynos5250-pmu",
70 		.compatible = "samsung,exynos5410-pmu",
73 		.compatible = "samsung,exynos5420-pmu",
76 		.compatible = "samsung,exynos5433-pmu",
90 	if (!dev->parent) {  in exynos_clkout_match_parent_dev()
92 		return -EINVAL;  in exynos_clkout_match_parent_dev()
97 	 * the dev->parent driver, so of_device_get_match_data() or  in exynos_clkout_match_parent_dev()
100 	match = of_match_device(exynos_clkout_ids, dev->parent);  in exynos_clkout_match_parent_dev()
103 		return -EINVAL;  in exynos_clkout_match_parent_dev()
105 	variant = match->data;  in exynos_clkout_match_parent_dev()
107 	*mux_mask = variant->mux_mask;  in exynos_clkout_match_parent_dev()
116 	struct exynos_clkout *clkout;  in exynos_clkout_probe()  local
120 	clkout = devm_kzalloc(&pdev->dev,  in exynos_clkout_probe()
121 			      struct_size(clkout, data.hws, EXYNOS_CLKOUT_NR_CLKS),  in exynos_clkout_probe()
123 	if (!clkout)  in exynos_clkout_probe()
124 		return -ENOMEM;  in exynos_clkout_probe()
126 	ret = exynos_clkout_match_parent_dev(&pdev->dev, &mux_mask);  in exynos_clkout_probe()
130 	clkout->np = pdev->dev.of_node;  in exynos_clkout_probe()
131 	if (!clkout->np) {  in exynos_clkout_probe()
133 		 * pdev->dev.parent was checked by exynos_clkout_match_parent_dev()  in exynos_clkout_probe()
136 		clkout->np = pdev->dev.parent->of_node;  in exynos_clkout_probe()
139 	platform_set_drvdata(pdev, clkout);  in exynos_clkout_probe()
141 	spin_lock_init(&clkout->slock);  in exynos_clkout_probe()
147 		snprintf(name, sizeof(name), "clkout%d", i);  in exynos_clkout_probe()
148 		parents[i] = of_clk_get_by_name(clkout->np, name);  in exynos_clkout_probe()
159 		return -EINVAL;  in exynos_clkout_probe()
161 	clkout->reg = of_iomap(clkout->np, 0);  in exynos_clkout_probe()
162 	if (!clkout->reg) {  in exynos_clkout_probe()
163 		ret = -ENODEV;  in exynos_clkout_probe()
167 	clkout->gate.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;  in exynos_clkout_probe()
168 	clkout->gate.bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT;  in exynos_clkout_probe()
169 	clkout->gate.flags = CLK_GATE_SET_TO_DISABLE;  in exynos_clkout_probe()
170 	clkout->gate.lock = &clkout->slock;  in exynos_clkout_probe()
172 	clkout->mux.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;  in exynos_clkout_probe()
173 	clkout->mux.mask = mux_mask;  in exynos_clkout_probe()
174 	clkout->mux.shift = EXYNOS_CLKOUT_MUX_SHIFT;  in exynos_clkout_probe()
175 	clkout->mux.lock = &clkout->slock;  in exynos_clkout_probe()
177 	clkout->data.hws[0] = clk_hw_register_composite(NULL, "clkout",  in exynos_clkout_probe()
178 				parent_names, parent_count, &clkout->mux.hw,  in exynos_clkout_probe()
179 				&clk_mux_ops, NULL, NULL, &clkout->gate.hw,  in exynos_clkout_probe()
182 	if (IS_ERR(clkout->data.hws[0])) {  in exynos_clkout_probe()
183 		ret = PTR_ERR(clkout->data.hws[0]);  in exynos_clkout_probe()
187 	clkout->data.num = EXYNOS_CLKOUT_NR_CLKS;  in exynos_clkout_probe()
188 	ret = of_clk_add_hw_provider(clkout->np, of_clk_hw_onecell_get, &clkout->data);  in exynos_clkout_probe()
195 	clk_hw_unregister(clkout->data.hws[0]);  in exynos_clkout_probe()
197 	iounmap(clkout->reg);  in exynos_clkout_probe()
203 	dev_err(&pdev->dev, "failed to register clkout clock\n");  in exynos_clkout_probe()
210 	struct exynos_clkout *clkout = platform_get_drvdata(pdev);  in exynos_clkout_remove()  local
212 	of_clk_del_provider(clkout->np);  in exynos_clkout_remove()
213 	clk_hw_unregister(clkout->data.hws[0]);  in exynos_clkout_remove()
214 	iounmap(clkout->reg);  in exynos_clkout_remove()
219 	struct exynos_clkout *clkout = dev_get_drvdata(dev);  in exynos_clkout_suspend()  local
221 	clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG);  in exynos_clkout_suspend()
228 	struct exynos_clkout *clkout = dev_get_drvdata(dev);  in exynos_clkout_resume()  local
230 	writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG);  in exynos_clkout_resume()
250 MODULE_DESCRIPTION("Samsung Exynos clock output driver");