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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>
This commit is contained in:
Aisheng Dong 2019-01-30 13:39:15 +00:00 committed by Stephen Boyd
parent cd67d32727
commit 666aed2d13
2 changed files with 100 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
drivers/clk/imx/clk-scu.c
View File

@ -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

16
drivers/clk/imx/clk-scu.h
View File

@ -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,