[PATCH V2 08/11] clk: imx: scu: add scu clock gpr mux
From: aisheng.dong@nxp.com (Dong Aisheng)
Date: 2018-09-25 16:43:54
Also in:
linux-clk
Subsystem:
common clk framework, nxp i.mx clock drivers, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Abel Vesa, Linus Torvalds
Add scu based clock gpr mux. Unlike the normal scu mux, such muxes are controlled by GPR bits through SCU sc_misc_set_control API. Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Fabio Estevam <redacted> Cc: Stephen Boyd <sboyd@kernel.org> Cc: Michael Turquette <mturquette@baylibre.com> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> --- ChangeLog: v1->v2: * no changes except headfile name updated --- drivers/clk/imx/scu/Makefile | 3 +- drivers/clk/imx/scu/clk-mux-gpr-scu.c | 90 +++++++++++++++++++++++++++++++++++ drivers/clk/imx/scu/clk-scu.h | 11 +++++ 3 files changed, 103 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/imx/scu/clk-mux-gpr-scu.c
diff --git a/drivers/clk/imx/scu/Makefile b/drivers/clk/imx/scu/Makefile
index aee56bf..a76ed78 100644
--- a/drivers/clk/imx/scu/Makefile
+++ b/drivers/clk/imx/scu/Makefile@@ -6,4 +6,5 @@ obj-$(CONFIG_MXC_CLK_SCU) += \ clk-divider-gpr-scu.o \ clk-gate-scu.o \ clk-gate-gpr-scu.o \ - clk-mux-scu.o + clk-mux-scu.o \ + clk-mux-gpr-scu.o
diff --git a/drivers/clk/imx/scu/clk-mux-gpr-scu.c b/drivers/clk/imx/scu/clk-mux-gpr-scu.c
new file mode 100644
index 0000000..c4b5687
--- /dev/null
+++ b/drivers/clk/imx/scu/clk-mux-gpr-scu.c@@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2016 Freescale Semiconductor, Inc. + * Copyright 2017~2018 NXP + * Dong Aisheng <aisheng.dong@nxp.com> + */ + +#include <linux/clk-provider.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <soc/imx/scu/sci.h> + +#include "clk-scu.h" + +struct clk_mux_gpr_scu { + struct clk_hw hw; + sc_rsrc_t rsrc_id; + sc_ctrl_t gpr_id; +}; + +#define to_clk_mux_gpr_scu(_hw) container_of(_hw, struct clk_mux_gpr_scu, hw) + +static u8 clk_mux_gpr_scu_get_parent(struct clk_hw *hw) +{ + struct clk_mux_gpr_scu *gpr_mux = to_clk_mux_gpr_scu(hw); + sc_err_t ret; + u32 val = 0; + + ret = sc_misc_get_control(ccm_ipc_handle, gpr_mux->rsrc_id, + gpr_mux->gpr_id, &val); + if (ret != SC_ERR_NONE) { + pr_warn("%s: failed to get clock parent %d\n", + clk_hw_get_name(hw), ret); + return 0; + } + + return (u8)val; +} + +static int clk_mux_gpr_scu_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_mux_gpr_scu *gpr_mux = to_clk_mux_gpr_scu(hw); + sc_err_t ret; + + ret = sc_misc_set_control(ccm_ipc_handle, gpr_mux->rsrc_id, + gpr_mux->gpr_id, index); + if (ret != SC_ERR_NONE) + return -EINVAL; + + return 0; +} + +static const struct clk_ops clk_mux_gpr_scu_ops = { + .get_parent = clk_mux_gpr_scu_get_parent, + .set_parent = clk_mux_gpr_scu_set_parent, +}; + +struct clk_hw *clk_register_mux_gpr_scu(const char *name, const char * const *parents, + int num_parents, unsigned long flags, + sc_rsrc_t rsrc_id, sc_ctrl_t gpr_id) +{ + struct clk_mux_gpr_scu *mux; + struct clk_init_data init; + struct clk_hw *hw; + int ret; + + mux = kzalloc(sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &clk_mux_gpr_scu_ops; + init.parent_names = parents; + init.num_parents = num_parents; + init.flags = flags; + + mux->hw.init = &init; + mux->rsrc_id = rsrc_id; + mux->gpr_id = gpr_id; + + hw = &mux->hw; + ret = clk_hw_register(NULL, hw); + if (ret) { + kfree(mux); + hw = ERR_PTR(ret); + } + + return hw; +}
diff --git a/drivers/clk/imx/scu/clk-scu.h b/drivers/clk/imx/scu/clk-scu.h
index 43009c4..828700d 100644
--- a/drivers/clk/imx/scu/clk-scu.h
+++ b/drivers/clk/imx/scu/clk-scu.h@@ -81,4 +81,15 @@ static inline struct clk_hw *imx_clk_mux_scu(const char *name, clk_type); } +struct clk_hw *clk_register_mux_gpr_scu(const char *name, const char * const *parents, + int num_parents, unsigned long flags, + sc_rsrc_t rsrc_id, sc_ctrl_t gpr_id); + +static inline struct clk_hw *imx_clk_mux_gpr_scu(const char *name, const char * const *parents, + int num_parents, sc_rsrc_t rsrc_id, sc_ctrl_t gpr_id) +{ + return clk_register_mux_gpr_scu(name, parents, num_parents, + CLK_SET_RATE_NO_REPARENT, rsrc_id, gpr_id); +} + #endif
--
2.7.4