1 files changed, 894 insertions, 0 deletions

diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
new file mode 100644
index 000000000..db307890e
--- /dev/null
+++ b/drivers/clk/imx/clk-scu.c
@@ -0,0 +1,894 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2021 NXP
+ *   Dong Aisheng <aisheng.dong@nxp.com>
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/arm-smccc.h>
+#include <linux/bsearch.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "clk-scu.h"
+
+#define IMX_SIP_CPUFREQ			0xC2000001
+#define IMX_SIP_SET_CPUFREQ		0x00
+
+static struct imx_sc_ipc *ccm_ipc_handle;
+static struct device_node *pd_np;
+static struct platform_driver imx_clk_scu_driver;
+static const struct imx_clk_scu_rsrc_table *rsrc_table;
+
+struct imx_scu_clk_node {
+	const char *name;
+	u32 rsrc;
+	u8 clk_type;
+	const char * const *parents;
+	int num_parents;
+
+	struct clk_hw *hw;
+	struct list_head node;
+};
+
+struct list_head imx_scu_clks[IMX_SC_R_LAST];
+
+/*
+ * struct clk_scu - Description of one SCU clock
+ * @hw: the common clk_hw
+ * @rsrc_id: resource ID of this SCU clock
+ * @clk_type: type of this clock resource
+ */
+struct clk_scu {
+	struct clk_hw hw;
+	u16 rsrc_id;
+	u8 clk_type;
+
+	/* for state save&restore */
+	struct clk_hw *parent;
+	u8 parent_index;
+	bool is_enabled;
+	u32 rate;
+};
+
+/*
+ * struct clk_gpr_scu - Description of one SCU GPR clock
+ * @hw: the common clk_hw
+ * @rsrc_id: resource ID of this SCU clock
+ * @gpr_id: GPR ID index to control the divider
+ */
+struct clk_gpr_scu {
+	struct clk_hw hw;
+	u16 rsrc_id;
+	u8 gpr_id;
+	u8 flags;
+	bool gate_invert;
+};
+
+#define to_clk_gpr_scu(_hw) container_of(_hw, struct clk_gpr_scu, hw)
+
+/*
+ * struct imx_sc_msg_req_set_clock_rate - clock set rate protocol
+ * @hdr: SCU protocol header
+ * @rate: rate to set
+ * @resource: clock resource to set rate
+ * @clk: clk type of this resource
+ *
+ * This structure describes the SCU protocol of clock rate set
+ */
+struct imx_sc_msg_req_set_clock_rate {
+	struct imx_sc_rpc_msg hdr;
+	__le32 rate;
+	__le16 resource;
+	u8 clk;
+} __packed __aligned(4);
+
+struct req_get_clock_rate {
+	__le16 resource;
+	u8 clk;
+} __packed __aligned(4);
+
+struct resp_get_clock_rate {
+	__le32 rate;
+};
+
+/*
+ * struct imx_sc_msg_get_clock_rate - clock get rate protocol
+ * @hdr: SCU protocol header
+ * @req: get rate request protocol
+ * @resp: get rate response protocol
+ *
+ * This structure describes the SCU protocol of clock rate get
+ */
+struct imx_sc_msg_get_clock_rate {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_get_clock_rate req;
+		struct resp_get_clock_rate resp;
+	} data;
+};
+
+/*
+ * struct imx_sc_msg_get_clock_parent - clock get parent protocol
+ * @hdr: SCU protocol header
+ * @req: get parent request protocol
+ * @resp: get parent response protocol
+ *
+ * This structure describes the SCU protocol of clock get parent
+ */
+struct imx_sc_msg_get_clock_parent {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_get_clock_parent {
+			__le16 resource;
+			u8 clk;
+		} __packed __aligned(4) req;
+		struct resp_get_clock_parent {
+			u8 parent;
+		} resp;
+	} data;
+};
+
+/*
+ * struct imx_sc_msg_set_clock_parent - clock set parent protocol
+ * @hdr: SCU protocol header
+ * @req: set parent request protocol
+ *
+ * This structure describes the SCU protocol of clock set parent
+ */
+struct imx_sc_msg_set_clock_parent {
+	struct imx_sc_rpc_msg hdr;
+	__le16 resource;
+	u8 clk;
+	u8 parent;
+} __packed;
+
+/*
+ * struct imx_sc_msg_req_clock_enable - clock gate protocol
+ * @hdr: SCU protocol header
+ * @resource: clock resource to gate
+ * @clk: clk type of this resource
+ * @enable: whether gate off the clock
+ * @autog: HW auto gate enable
+ *
+ * This structure describes the SCU protocol of clock gate
+ */
+struct imx_sc_msg_req_clock_enable {
+	struct imx_sc_rpc_msg hdr;
+	__le16 resource;
+	u8 clk;
+	u8 enable;
+	u8 autog;
+} __packed __aligned(4);
+
+static inline struct clk_scu *to_clk_scu(struct clk_hw *hw)
+{
+	return container_of(hw, struct clk_scu, hw);
+}
+
+static inline int imx_scu_clk_search_cmp(const void *rsrc, const void *rsrc_p)
+{
+	return *(u32 *)rsrc - *(u32 *)rsrc_p;
+}
+
+static bool imx_scu_clk_is_valid(u32 rsrc_id)
+{
+	void *p;
+
+	if (!rsrc_table)
+		return true;
+
+	p = bsearch(&rsrc_id, rsrc_table->rsrc, rsrc_table->num,
+		    sizeof(rsrc_table->rsrc[0]), imx_scu_clk_search_cmp);
+
+	return p != NULL;
+}
+
+int imx_clk_scu_init(struct device_node *np,
+		     const struct imx_clk_scu_rsrc_table *data)
+{
+	u32 clk_cells;
+	int ret, i;
+
+	ret = imx_scu_get_handle(&ccm_ipc_handle);
+	if (ret)
+		return ret;
+
+	of_property_read_u32(np, "#clock-cells", &clk_cells);
+
+	if (clk_cells == 2) {
+		for (i = 0; i < IMX_SC_R_LAST; i++)
+			INIT_LIST_HEAD(&imx_scu_clks[i]);
+
+		/* pd_np will be used to attach power domains later */
+		pd_np = of_find_compatible_node(NULL, NULL, "fsl,scu-pd");
+		if (!pd_np)
+			return -EINVAL;
+
+		rsrc_table = data;
+	}
+
+	return platform_driver_register(&imx_clk_scu_driver);
+}
+
+/*
+ * clk_scu_recalc_rate - Get clock rate for a SCU clock
+ * @hw: clock to get rate for
+ * @parent_rate: parent rate provided by common clock framework, not used
+ *
+ * Gets the current clock rate of a SCU clock. Returns the current
+ * clock rate, or zero in failure.
+ */
+static unsigned long clk_scu_recalc_rate(struct clk_hw *hw,
+					 unsigned long parent_rate)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	struct imx_sc_msg_get_clock_rate msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_GET_CLOCK_RATE;
+	hdr->size = 2;
+
+	msg.data.req.resource = cpu_to_le16(clk->rsrc_id);
+	msg.data.req.clk = clk->clk_type;
+
+	ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+	if (ret) {
+		pr_err("%s: failed to get clock rate %d\n",
+		       clk_hw_get_name(hw), ret);
+		return 0;
+	}
+
+	return le32_to_cpu(msg.data.resp.rate);
+}
+
+/*
+ * clk_scu_round_rate - Round clock rate for a SCU clock
+ * @hw: clock to round rate for
+ * @rate: rate to round
+ * @parent_rate: parent rate provided by common clock framework, not used
+ *
+ * Returns the current clock rate, or zero in failure.
+ */
+static long clk_scu_round_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long *parent_rate)
+{
+	/*
+	 * Assume we support all the requested rate and let the SCU firmware
+	 * to handle the left work
+	 */
+	return rate;
+}
+
+static int clk_scu_atf_set_cpu_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	struct arm_smccc_res res;
+	unsigned long cluster_id;
+
+	if (clk->rsrc_id == IMX_SC_R_A35 || clk->rsrc_id == IMX_SC_R_A53)
+		cluster_id = 0;
+	else if (clk->rsrc_id == IMX_SC_R_A72)
+		cluster_id = 1;
+	else
+		return -EINVAL;
+
+	/* CPU frequency scaling can ONLY be done by ARM-Trusted-Firmware */
+	arm_smccc_smc(IMX_SIP_CPUFREQ, IMX_SIP_SET_CPUFREQ,
+		      cluster_id, rate, 0, 0, 0, 0, &res);
+
+	return 0;
+}
+
+/*
+ * clk_scu_set_rate - Set rate for a SCU clock
+ * @hw: clock to change rate for
+ * @rate: target rate for the clock
+ * @parent_rate: rate of the clock parent, not used for SCU clocks
+ *
+ * Sets a clock frequency for a SCU clock. Returns the SCU
+ * protocol status.
+ */
+static int clk_scu_set_rate(struct clk_hw *hw, unsigned long rate,
+			    unsigned long parent_rate)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	struct imx_sc_msg_req_set_clock_rate msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_SET_CLOCK_RATE;
+	hdr->size = 3;
+
+	msg.rate = cpu_to_le32(rate);
+	msg.resource = cpu_to_le16(clk->rsrc_id);
+	msg.clk = clk->clk_type;
+
+	return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+}
+
+static u8 clk_scu_get_parent(struct clk_hw *hw)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	struct imx_sc_msg_get_clock_parent msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_GET_CLOCK_PARENT;
+	hdr->size = 2;
+
+	msg.data.req.resource = cpu_to_le16(clk->rsrc_id);
+	msg.data.req.clk = clk->clk_type;
+
+	ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+	if (ret) {
+		pr_err("%s: failed to get clock parent %d\n",
+		       clk_hw_get_name(hw), ret);
+		return 0;
+	}
+
+	clk->parent_index = msg.data.resp.parent;
+
+	return msg.data.resp.parent;
+}
+
+static int clk_scu_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	struct imx_sc_msg_set_clock_parent msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_SET_CLOCK_PARENT;
+	hdr->size = 2;
+
+	msg.resource = cpu_to_le16(clk->rsrc_id);
+	msg.clk = clk->clk_type;
+	msg.parent = index;
+
+	ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+	if (ret) {
+		pr_err("%s: failed to set clock parent %d\n",
+		       clk_hw_get_name(hw), ret);
+		return ret;
+	}
+
+	clk->parent_index = index;
+
+	return 0;
+}
+
+static int sc_pm_clock_enable(struct imx_sc_ipc *ipc, u16 resource,
+			      u8 clk, bool enable, bool autog)
+{
+	struct imx_sc_msg_req_clock_enable msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_CLOCK_ENABLE;
+	hdr->size = 3;
+
+	msg.resource = cpu_to_le16(resource);
+	msg.clk = clk;
+	msg.enable = enable;
+	msg.autog = autog;
+
+	return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+}
+
+/*
+ * clk_scu_prepare - Enable a SCU clock
+ * @hw: clock to enable
+ *
+ * Enable the clock at the DSC slice level
+ */
+static int clk_scu_prepare(struct clk_hw *hw)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+
+	return sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,
+				  clk->clk_type, true, false);
+}
+
+/*
+ * clk_scu_unprepare - Disable a SCU clock
+ * @hw: clock to enable
+ *
+ * Disable the clock at the DSC slice level
+ */
+static void clk_scu_unprepare(struct clk_hw *hw)
+{
+	struct clk_scu *clk = to_clk_scu(hw);
+	int ret;
+
+	ret = sc_pm_clock_enable(ccm_ipc_handle, clk->rsrc_id,
+				 clk->clk_type, false, false);
+	if (ret)
+		pr_warn("%s: clk unprepare failed %d\n", clk_hw_get_name(hw),
+			ret);
+}
+
+static const struct clk_ops clk_scu_ops = {
+	.recalc_rate = clk_scu_recalc_rate,
+	.round_rate = clk_scu_round_rate,
+	.set_rate = clk_scu_set_rate,
+	.get_parent = clk_scu_get_parent,
+	.set_parent = clk_scu_set_parent,
+	.prepare = clk_scu_prepare,
+	.unprepare = clk_scu_unprepare,
+};
+
+static const struct clk_ops clk_scu_cpu_ops = {
+	.recalc_rate = clk_scu_recalc_rate,
+	.round_rate = clk_scu_round_rate,
+	.set_rate = clk_scu_atf_set_cpu_rate,
+	.prepare = clk_scu_prepare,
+	.unprepare = clk_scu_unprepare,
+};
+
+static const struct clk_ops clk_scu_pi_ops = {
+	.recalc_rate = clk_scu_recalc_rate,
+	.round_rate  = clk_scu_round_rate,
+	.set_rate    = clk_scu_set_rate,
+};
+
+struct clk_hw *__imx_clk_scu(struct device *dev, const char *name,
+			     const char * const *parents, int num_parents,
+			     u32 rsrc_id, u8 clk_type)
+{
+	struct clk_init_data init;
+	struct clk_scu *clk;
+	struct clk_hw *hw;
+	int ret;
+
+	clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+	if (!clk)
+		return ERR_PTR(-ENOMEM);
+
+	clk->rsrc_id = rsrc_id;
+	clk->clk_type = clk_type;
+
+	init.name = name;
+	init.ops = &clk_scu_ops;
+	if (rsrc_id == IMX_SC_R_A35 || rsrc_id == IMX_SC_R_A53 || rsrc_id == IMX_SC_R_A72)
+		init.ops = &clk_scu_cpu_ops;
+	else if (rsrc_id == IMX_SC_R_PI_0_PLL)
+		init.ops = &clk_scu_pi_ops;
+	else
+		init.ops = &clk_scu_ops;
+	init.parent_names = parents;
+	init.num_parents = num_parents;
+
+	/*
+	 * Note on MX8, the clocks are tightly coupled with power domain
+	 * that once the power domain is off, the clock status may be
+	 * lost. So we make it NOCACHE to let user to retrieve the real
+	 * clock status from HW instead of using the possible invalid
+	 * cached rate.
+	 */
+	init.flags = CLK_GET_RATE_NOCACHE;
+	clk->hw.init = &init;
+
+	hw = &clk->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
+		kfree(clk);
+		hw = ERR_PTR(ret);
+		return hw;
+	}
+
+	if (dev)
+		dev_set_drvdata(dev, clk);
+
+	return hw;
+}
+
+struct clk_hw *imx_scu_of_clk_src_get(struct of_phandle_args *clkspec,
+				      void *data)
+{
+	unsigned int rsrc = clkspec->args[0];
+	unsigned int idx = clkspec->args[1];
+	struct list_head *scu_clks = data;
+	struct imx_scu_clk_node *clk;
+
+	list_for_each_entry(clk, &scu_clks[rsrc], node) {
+		if (clk->clk_type == idx)
+			return clk->hw;
+	}
+
+	return ERR_PTR(-ENODEV);
+}
+
+static int imx_clk_scu_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct imx_scu_clk_node *clk = dev_get_platdata(dev);
+	struct clk_hw *hw;
+	int ret;
+
+	if (!((clk->rsrc == IMX_SC_R_A35) || (clk->rsrc == IMX_SC_R_A53) ||
+	    (clk->rsrc == IMX_SC_R_A72))) {
+		pm_runtime_set_suspended(dev);
+		pm_runtime_set_autosuspend_delay(dev, 50);
+		pm_runtime_use_autosuspend(&pdev->dev);
+		pm_runtime_enable(dev);
+
+		ret = pm_runtime_resume_and_get(dev);
+		if (ret) {
+			pm_genpd_remove_device(dev);
+			pm_runtime_disable(dev);
+			return ret;
+		}
+	}
+
+	hw = __imx_clk_scu(dev, clk->name, clk->parents, clk->num_parents,
+			   clk->rsrc, clk->clk_type);
+	if (IS_ERR(hw)) {
+		pm_runtime_disable(dev);
+		return PTR_ERR(hw);
+	}
+
+	clk->hw = hw;
+	list_add_tail(&clk->node, &imx_scu_clks[clk->rsrc]);
+
+	if (!((clk->rsrc == IMX_SC_R_A35) || (clk->rsrc == IMX_SC_R_A53) ||
+	    (clk->rsrc == IMX_SC_R_A72))) {
+		pm_runtime_mark_last_busy(&pdev->dev);
+		pm_runtime_put_autosuspend(&pdev->dev);
+	}
+
+	dev_dbg(dev, "register SCU clock rsrc:%d type:%d\n", clk->rsrc,
+		clk->clk_type);
+
+	return 0;
+}
+
+static int __maybe_unused imx_clk_scu_suspend(struct device *dev)
+{
+	struct clk_scu *clk = dev_get_drvdata(dev);
+	u32 rsrc_id = clk->rsrc_id;
+
+	if ((rsrc_id == IMX_SC_R_A35) || (rsrc_id == IMX_SC_R_A53) ||
+	    (rsrc_id == IMX_SC_R_A72))
+		return 0;
+
+	clk->parent = clk_hw_get_parent(&clk->hw);
+
+	/* DC SS needs to handle bypass clock using non-cached clock rate */
+	if (clk->rsrc_id == IMX_SC_R_DC_0_VIDEO0 ||
+		clk->rsrc_id == IMX_SC_R_DC_0_VIDEO1 ||
+		clk->rsrc_id == IMX_SC_R_DC_1_VIDEO0 ||
+		clk->rsrc_id == IMX_SC_R_DC_1_VIDEO1)
+		clk->rate = clk_scu_recalc_rate(&clk->hw, 0);
+	else
+		clk->rate = clk_hw_get_rate(&clk->hw);
+	clk->is_enabled = clk_hw_is_enabled(&clk->hw);
+
+	if (clk->parent)
+		dev_dbg(dev, "save parent %s idx %u\n", clk_hw_get_name(clk->parent),
+			clk->parent_index);
+
+	if (clk->rate)
+		dev_dbg(dev, "save rate %d\n", clk->rate);
+
+	if (clk->is_enabled)
+		dev_dbg(dev, "save enabled state\n");
+
+	return 0;
+}
+
+static int __maybe_unused imx_clk_scu_resume(struct device *dev)
+{
+	struct clk_scu *clk = dev_get_drvdata(dev);
+	u32 rsrc_id = clk->rsrc_id;
+	int ret = 0;
+
+	if ((rsrc_id == IMX_SC_R_A35) || (rsrc_id == IMX_SC_R_A53) ||
+	    (rsrc_id == IMX_SC_R_A72))
+		return 0;
+
+	if (clk->parent) {
+		ret = clk_scu_set_parent(&clk->hw, clk->parent_index);
+		dev_dbg(dev, "restore parent %s idx %u %s\n",
+			clk_hw_get_name(clk->parent),
+			clk->parent_index, !ret ? "success" : "failed");
+	}
+
+	if (clk->rate) {
+		ret = clk_scu_set_rate(&clk->hw, clk->rate, 0);
+		dev_dbg(dev, "restore rate %d %s\n", clk->rate,
+			!ret ? "success" : "failed");
+	}
+
+	if (clk->is_enabled && rsrc_id != IMX_SC_R_PI_0_PLL) {
+		ret = clk_scu_prepare(&clk->hw);
+		dev_dbg(dev, "restore enabled state %s\n",
+			!ret ? "success" : "failed");
+	}
+
+	return ret;
+}
+
+static const struct dev_pm_ops imx_clk_scu_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_scu_suspend,
+				      imx_clk_scu_resume)
+};
+
+static struct platform_driver imx_clk_scu_driver = {
+	.driver = {
+		.name = "imx-scu-clk",
+		.suppress_bind_attrs = true,
+		.pm = &imx_clk_scu_pm_ops,
+	},
+	.probe = imx_clk_scu_probe,
+};
+
+static int imx_clk_scu_attach_pd(struct device *dev, u32 rsrc_id)
+{
+	struct of_phandle_args genpdspec = {
+		.np = pd_np,
+		.args_count = 1,
+		.args[0] = rsrc_id,
+	};
+
+	if (rsrc_id == IMX_SC_R_A35 || rsrc_id == IMX_SC_R_A53 ||
+	    rsrc_id == IMX_SC_R_A72)
+		return 0;
+
+	return of_genpd_add_device(&genpdspec, dev);
+}
+
+struct clk_hw *imx_clk_scu_alloc_dev(const char *name,
+				     const char * const *parents,
+				     int num_parents, u32 rsrc_id, u8 clk_type)
+{
+	struct imx_scu_clk_node clk = {
+		.name = name,
+		.rsrc = rsrc_id,
+		.clk_type = clk_type,
+		.parents = parents,
+		.num_parents = num_parents,
+	};
+	struct platform_device *pdev;
+	int ret;
+
+	if (!imx_scu_clk_is_valid(rsrc_id))
+		return ERR_PTR(-EINVAL);
+
+	pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE);
+	if (!pdev) {
+		pr_err("%s: failed to allocate scu clk dev rsrc %d type %d\n",
+		       name, rsrc_id, clk_type);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	ret = platform_device_add_data(pdev, &clk, sizeof(clk));
+	if (ret) {
+		platform_device_put(pdev);
+		return ERR_PTR(ret);
+	}
+
+	ret = driver_set_override(&pdev->dev, &pdev->driver_override,
+				  "imx-scu-clk", strlen("imx-scu-clk"));
+	if (ret) {
+		platform_device_put(pdev);
+		return ERR_PTR(ret);
+	}
+
+	ret = imx_clk_scu_attach_pd(&pdev->dev, rsrc_id);
+	if (ret)
+		pr_warn("%s: failed to attached the power domain %d\n",
+			name, ret);
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		platform_device_put(pdev);
+		return ERR_PTR(ret);
+	}
+
+	/* For API backwards compatiblilty, simply return NULL for success */
+	return NULL;
+}
+
+void imx_clk_scu_unregister(void)
+{
+	struct imx_scu_clk_node *clk, *n;
+	int i;
+
+	for (i = 0; i < IMX_SC_R_LAST; i++) {
+		list_for_each_entry_safe(clk, n, &imx_scu_clks[i], node) {
+			clk_hw_unregister(clk->hw);
+			kfree(clk);
+		}
+	}
+}
+
+static unsigned long clk_gpr_div_scu_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+	unsigned long rate = 0;
+	u32 val;
+	int err;
+
+	err = imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+				      clk->gpr_id, &val);
+
+	rate  = val ? parent_rate / 2 : parent_rate;
+
+	return err ? 0 : rate;
+}
+
+static long clk_gpr_div_scu_round_rate(struct clk_hw *hw, unsigned long rate,
+				   unsigned long *prate)
+{
+	if (rate < *prate)
+		rate = *prate / 2;
+	else
+		rate = *prate;
+
+	return rate;
+}
+
+static int clk_gpr_div_scu_set_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+	uint32_t val;
+	int err;
+
+	val = (rate < parent_rate) ? 1 : 0;
+	err = imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+				      clk->gpr_id, val);
+
+	return err ? -EINVAL : 0;
+}
+
+static const struct clk_ops clk_gpr_div_scu_ops = {
+	.recalc_rate = clk_gpr_div_scu_recalc_rate,
+	.round_rate = clk_gpr_div_scu_round_rate,
+	.set_rate = clk_gpr_div_scu_set_rate,
+};
+
+static u8 clk_gpr_mux_scu_get_parent(struct clk_hw *hw)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+	u32 val = 0;
+
+	imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+				clk->gpr_id, &val);
+
+	return (u8)val;
+}
+
+static int clk_gpr_mux_scu_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+
+	return imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+				       clk->gpr_id, index);
+}
+
+static const struct clk_ops clk_gpr_mux_scu_ops = {
+	.get_parent = clk_gpr_mux_scu_get_parent,
+	.set_parent = clk_gpr_mux_scu_set_parent,
+};
+
+static int clk_gpr_gate_scu_prepare(struct clk_hw *hw)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+
+	return imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+				       clk->gpr_id, !clk->gate_invert);
+}
+
+static void clk_gpr_gate_scu_unprepare(struct clk_hw *hw)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+	int ret;
+
+	ret = imx_sc_misc_set_control(ccm_ipc_handle, clk->rsrc_id,
+				      clk->gpr_id, clk->gate_invert);
+	if (ret)
+		pr_err("%s: clk unprepare failed %d\n", clk_hw_get_name(hw),
+		       ret);
+}
+
+static int clk_gpr_gate_scu_is_prepared(struct clk_hw *hw)
+{
+	struct clk_gpr_scu *clk = to_clk_gpr_scu(hw);
+	int ret;
+	u32 val;
+
+	ret = imx_sc_misc_get_control(ccm_ipc_handle, clk->rsrc_id,
+				      clk->gpr_id, &val);
+	if (ret)
+		return ret;
+
+	return clk->gate_invert ? !val : val;
+}
+
+static const struct clk_ops clk_gpr_gate_scu_ops = {
+	.prepare = clk_gpr_gate_scu_prepare,
+	.unprepare = clk_gpr_gate_scu_unprepare,
+	.is_prepared = clk_gpr_gate_scu_is_prepared,
+};
+
+struct clk_hw *__imx_clk_gpr_scu(const char *name, const char * const *parent_name,
+				 int num_parents, u32 rsrc_id, u8 gpr_id, u8 flags,
+				 bool invert)
+{
+	struct imx_scu_clk_node *clk_node;
+	struct clk_gpr_scu *clk;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (rsrc_id >= IMX_SC_R_LAST || gpr_id >= IMX_SC_C_LAST)
+		return ERR_PTR(-EINVAL);
+
+	clk_node = kzalloc(sizeof(*clk_node), GFP_KERNEL);
+	if (!clk_node)
+		return ERR_PTR(-ENOMEM);
+
+	if (!imx_scu_clk_is_valid(rsrc_id)) {
+		kfree(clk_node);
+		return ERR_PTR(-EINVAL);
+	}
+
+	clk = kzalloc(sizeof(*clk), GFP_KERNEL);
+	if (!clk) {
+		kfree(clk_node);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	clk->rsrc_id = rsrc_id;
+	clk->gpr_id = gpr_id;
+	clk->flags = flags;
+	clk->gate_invert = invert;
+
+	if (flags & IMX_SCU_GPR_CLK_GATE)
+		init.ops = &clk_gpr_gate_scu_ops;
+
+	if (flags & IMX_SCU_GPR_CLK_DIV)
+		init.ops = &clk_gpr_div_scu_ops;
+
+	if (flags & IMX_SCU_GPR_CLK_MUX)
+		init.ops = &clk_gpr_mux_scu_ops;
+
+	init.flags = 0;
+	init.name = name;
+	init.parent_names = parent_name;
+	init.num_parents = num_parents;
+
+	clk->hw.init = &init;
+
+	hw = &clk->hw;
+	ret = clk_hw_register(NULL, hw);
+	if (ret) {
+		kfree(clk);
+		kfree(clk_node);
+		hw = ERR_PTR(ret);
+	} else {
+		clk_node->hw = hw;
+		clk_node->clk_type = gpr_id;
+		list_add_tail(&clk_node->node, &imx_scu_clks[rsrc_id]);
+	}
+
+	return hw;
+}