clk: imx: scu: add set parent support

Add clk scu set parents support.

Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
[sboyd@kernel.org: Remove le32_to_cpu() on get_parent op]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/imx/clk-scu.c

@@ -65,6 +65,41 @@ struct imx_sc_msg_get_clock_rate {
 	} 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 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
@@ -173,6 +208,49 @@ static int clk_scu_set_rate(struct clk_hw *hw, unsigned long rate,
 	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;
+	}
+
+	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;
+
+	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;
+
+	return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);
+}
+
 static int sc_pm_clock_enable(struct imx_sc_ipc *ipc, u16 resource,
 			      u8 clk, bool enable, bool autog)
 {
@@ -228,11 +306,14 @@ 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,
 };
 
-struct clk_hw *imx_clk_scu(const char *name, u32 rsrc_id, u8 clk_type)
+struct clk_hw *__imx_clk_scu(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;
@@ -248,7 +329,9 @@ struct clk_hw *imx_clk_scu(const char *name, u32 rsrc_id, u8 clk_type)
 
 	init.name = name;
 	init.ops = &clk_scu_ops;
-	init.num_parents = 0;
+	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

drivers/clk/imx/clk-scu.h

@@ -10,7 +10,21 @@
 #include <linux/firmware/imx/sci.h>
 
 int imx_clk_scu_init(void);
-struct clk_hw *imx_clk_scu(const char *name, u32 rsrc_id, u8 clk_type);
+
+struct clk_hw *__imx_clk_scu(const char *name, const char * const *parents,
+			     int num_parents, u32 rsrc_id, u8 clk_type);
+
+static inline struct clk_hw *imx_clk_scu(const char *name, u32 rsrc_id,
+					 u8 clk_type)
+{
+	return __imx_clk_scu(name, NULL, 0, rsrc_id, clk_type);
+}
+
+static inline struct clk_hw *imx_clk_scu2(const char *name, const char * const *parents,
+					  int num_parents, u32 rsrc_id, u8 clk_type)
+{
+	return __imx_clk_scu(name, parents, num_parents, rsrc_id, clk_type);
+}
 
 struct clk_hw *imx_clk_lpcg_scu(const char *name, const char *parent_name,
 				unsigned long flags, void __iomem *reg,