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authorJames Hogan <james.hogan@imgtec.com>2013-07-29 12:25:01 +0100
committerMike Turquette <mturquette@linaro.org>2013-08-19 12:27:17 -0700
commit819c1de344c5b8350bffd35be9a0fa74541292d3 (patch)
treea7829ac81de6d968cc24516f17c87da98c528d06 /drivers/clk/zynq
parent71472c0c06cf9a3d1540762ea205654c584e3bc4 (diff)
clk: add CLK_SET_RATE_NO_REPARENT flag
Add a CLK_SET_RATE_NO_REPARENT clock flag, which will prevent muxes being reparented during clk_set_rate. To avoid breaking existing platforms, all callers of clk_register_mux() are adjusted to pass the new flag. Platform maintainers are encouraged to remove the flag if they wish to allow mux reparenting on set_rate. Signed-off-by: James Hogan <james.hogan@imgtec.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Mike Turquette <mturquette@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Viresh Kumar <viresh.linux@gmail.com> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Haojian Zhuang <haojian.zhuang@linaro.org> Cc: Chao Xie <xiechao.mail@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Emilio López" <emilio@elopez.com.ar> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Prashant Gaikwad <pgaikwad@nvidia.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Peter De Schrijver <pdeschrijver@nvidia.com> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Andrew Chew <achew@nvidia.com> Cc: Doug Anderson <dianders@chromium.org> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Paul Walmsley <pwalmsley@nvidia.com> Cc: Sylwester Nawrocki <s.nawrocki@samsung.com> Cc: Thomas Abraham <thomas.abraham@linaro.org> Cc: Tomasz Figa <t.figa@samsung.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: spear-devel@list.st.com Cc: linux-tegra@vger.kernel.org Tested-by: Haojian Zhuang <haojian.zhuang@gmail.com> Acked-by: Stephen Warren <swarren@nvidia.com> [tegra] Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> [sunxi] Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com> [Zynq] Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/zynq')
-rw-r--r--drivers/clk/zynq/clkc.c86
1 files changed, 50 insertions, 36 deletions
diff --git a/drivers/clk/zynq/clkc.c b/drivers/clk/zynq/clkc.c
index 5c205b60a82..e05c9e3f138 100644
--- a/drivers/clk/zynq/clkc.c
+++ b/drivers/clk/zynq/clkc.c
@@ -124,8 +124,9 @@ static void __init zynq_clk_register_fclk(enum zynq_clk fclk,
div0_name = kasprintf(GFP_KERNEL, "%s_div0", clk_name);
div1_name = kasprintf(GFP_KERNEL, "%s_div1", clk_name);
- clk = clk_register_mux(NULL, mux_name, parents, 4, 0,
- fclk_ctrl_reg, 4, 2, 0, fclk_lock);
+ clk = clk_register_mux(NULL, mux_name, parents, 4,
+ CLK_SET_RATE_NO_REPARENT, fclk_ctrl_reg, 4, 2, 0,
+ fclk_lock);
clk = clk_register_divider(NULL, div0_name, mux_name,
0, fclk_ctrl_reg, 8, 6, CLK_DIVIDER_ONE_BASED |
@@ -167,8 +168,8 @@ static void __init zynq_clk_register_periph_clk(enum zynq_clk clk0,
mux_name = kasprintf(GFP_KERNEL, "%s_mux", clk_name0);
div_name = kasprintf(GFP_KERNEL, "%s_div", clk_name0);
- clk = clk_register_mux(NULL, mux_name, parents, 4, 0,
- clk_ctrl, 4, 2, 0, lock);
+ clk = clk_register_mux(NULL, mux_name, parents, 4,
+ CLK_SET_RATE_NO_REPARENT, clk_ctrl, 4, 2, 0, lock);
clk = clk_register_divider(NULL, div_name, mux_name, 0, clk_ctrl, 8, 6,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO, lock);
@@ -235,25 +236,26 @@ static void __init zynq_clk_setup(struct device_node *np)
clk = clk_register_zynq_pll("armpll_int", "ps_clk", SLCR_ARMPLL_CTRL,
SLCR_PLL_STATUS, 0, &armpll_lock);
clks[armpll] = clk_register_mux(NULL, clk_output_name[armpll],
- armpll_parents, 2, 0, SLCR_ARMPLL_CTRL, 4, 1, 0,
- &armpll_lock);
+ armpll_parents, 2, CLK_SET_RATE_NO_REPARENT,
+ SLCR_ARMPLL_CTRL, 4, 1, 0, &armpll_lock);
clk = clk_register_zynq_pll("ddrpll_int", "ps_clk", SLCR_DDRPLL_CTRL,
SLCR_PLL_STATUS, 1, &ddrpll_lock);
clks[ddrpll] = clk_register_mux(NULL, clk_output_name[ddrpll],
- ddrpll_parents, 2, 0, SLCR_DDRPLL_CTRL, 4, 1, 0,
- &ddrpll_lock);
+ ddrpll_parents, 2, CLK_SET_RATE_NO_REPARENT,
+ SLCR_DDRPLL_CTRL, 4, 1, 0, &ddrpll_lock);
clk = clk_register_zynq_pll("iopll_int", "ps_clk", SLCR_IOPLL_CTRL,
SLCR_PLL_STATUS, 2, &iopll_lock);
clks[iopll] = clk_register_mux(NULL, clk_output_name[iopll],
- iopll_parents, 2, 0, SLCR_IOPLL_CTRL, 4, 1, 0,
- &iopll_lock);
+ iopll_parents, 2, CLK_SET_RATE_NO_REPARENT,
+ SLCR_IOPLL_CTRL, 4, 1, 0, &iopll_lock);
/* CPU clocks */
tmp = readl(SLCR_621_TRUE) & 1;
- clk = clk_register_mux(NULL, "cpu_mux", cpu_parents, 4, 0,
- SLCR_ARM_CLK_CTRL, 4, 2, 0, &armclk_lock);
+ clk = clk_register_mux(NULL, "cpu_mux", cpu_parents, 4,
+ CLK_SET_RATE_NO_REPARENT, SLCR_ARM_CLK_CTRL, 4, 2, 0,
+ &armclk_lock);
clk = clk_register_divider(NULL, "cpu_div", "cpu_mux", 0,
SLCR_ARM_CLK_CTRL, 8, 6, CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO, &armclk_lock);
@@ -292,8 +294,9 @@ static void __init zynq_clk_setup(struct device_node *np)
swdt_ext_clk_mux_parents[i + 1] = dummy_nm;
}
clks[swdt] = clk_register_mux(NULL, clk_output_name[swdt],
- swdt_ext_clk_mux_parents, 2, CLK_SET_RATE_PARENT,
- SLCR_SWDT_CLK_SEL, 0, 1, 0, &gem0clk_lock);
+ swdt_ext_clk_mux_parents, 2, CLK_SET_RATE_PARENT |
+ CLK_SET_RATE_NO_REPARENT, SLCR_SWDT_CLK_SEL, 0, 1, 0,
+ &gem0clk_lock);
/* DDR clocks */
clk = clk_register_divider(NULL, "ddr2x_div", "ddrpll", 0,
@@ -355,8 +358,9 @@ static void __init zynq_clk_setup(struct device_node *np)
gem0_mux_parents[i + 1] = of_clk_get_parent_name(np,
idx);
}
- clk = clk_register_mux(NULL, "gem0_mux", periph_parents, 4, 0,
- SLCR_GEM0_CLK_CTRL, 4, 2, 0, &gem0clk_lock);
+ clk = clk_register_mux(NULL, "gem0_mux", periph_parents, 4,
+ CLK_SET_RATE_NO_REPARENT, SLCR_GEM0_CLK_CTRL, 4, 2, 0,
+ &gem0clk_lock);
clk = clk_register_divider(NULL, "gem0_div0", "gem0_mux", 0,
SLCR_GEM0_CLK_CTRL, 8, 6, CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO, &gem0clk_lock);
@@ -364,8 +368,9 @@ static void __init zynq_clk_setup(struct device_node *np)
CLK_SET_RATE_PARENT, SLCR_GEM0_CLK_CTRL, 20, 6,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
&gem0clk_lock);
- clk = clk_register_mux(NULL, "gem0_emio_mux", gem0_mux_parents, 2, 0,
- SLCR_GEM0_CLK_CTRL, 6, 1, 0, &gem0clk_lock);
+ clk = clk_register_mux(NULL, "gem0_emio_mux", gem0_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT, SLCR_GEM0_CLK_CTRL, 6, 1, 0,
+ &gem0clk_lock);
clks[gem0] = clk_register_gate(NULL, clk_output_name[gem0],
"gem0_emio_mux", CLK_SET_RATE_PARENT,
SLCR_GEM0_CLK_CTRL, 0, 0, &gem0clk_lock);
@@ -377,8 +382,9 @@ static void __init zynq_clk_setup(struct device_node *np)
gem1_mux_parents[i + 1] = of_clk_get_parent_name(np,
idx);
}
- clk = clk_register_mux(NULL, "gem1_mux", periph_parents, 4, 0,
- SLCR_GEM1_CLK_CTRL, 4, 2, 0, &gem1clk_lock);
+ clk = clk_register_mux(NULL, "gem1_mux", periph_parents, 4,
+ CLK_SET_RATE_NO_REPARENT, SLCR_GEM1_CLK_CTRL, 4, 2, 0,
+ &gem1clk_lock);
clk = clk_register_divider(NULL, "gem1_div0", "gem1_mux", 0,
SLCR_GEM1_CLK_CTRL, 8, 6, CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO, &gem1clk_lock);
@@ -386,8 +392,9 @@ static void __init zynq_clk_setup(struct device_node *np)
CLK_SET_RATE_PARENT, SLCR_GEM1_CLK_CTRL, 20, 6,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO,
&gem1clk_lock);
- clk = clk_register_mux(NULL, "gem1_emio_mux", gem1_mux_parents, 2, 0,
- SLCR_GEM1_CLK_CTRL, 6, 1, 0, &gem1clk_lock);
+ clk = clk_register_mux(NULL, "gem1_emio_mux", gem1_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT, SLCR_GEM1_CLK_CTRL, 6, 1, 0,
+ &gem1clk_lock);
clks[gem1] = clk_register_gate(NULL, clk_output_name[gem1],
"gem1_emio_mux", CLK_SET_RATE_PARENT,
SLCR_GEM1_CLK_CTRL, 0, 0, &gem1clk_lock);
@@ -406,8 +413,9 @@ static void __init zynq_clk_setup(struct device_node *np)
can_mio_mux_parents[i] = dummy_nm;
}
kfree(clk_name);
- clk = clk_register_mux(NULL, "can_mux", periph_parents, 4, 0,
- SLCR_CAN_CLK_CTRL, 4, 2, 0, &canclk_lock);
+ clk = clk_register_mux(NULL, "can_mux", periph_parents, 4,
+ CLK_SET_RATE_NO_REPARENT, SLCR_CAN_CLK_CTRL, 4, 2, 0,
+ &canclk_lock);
clk = clk_register_divider(NULL, "can_div0", "can_mux", 0,
SLCR_CAN_CLK_CTRL, 8, 6, CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO, &canclk_lock);
@@ -422,17 +430,21 @@ static void __init zynq_clk_setup(struct device_node *np)
CLK_SET_RATE_PARENT, SLCR_CAN_CLK_CTRL, 1, 0,
&canclk_lock);
clk = clk_register_mux(NULL, "can0_mio_mux",
- can_mio_mux_parents, 54, CLK_SET_RATE_PARENT,
- SLCR_CAN_MIOCLK_CTRL, 0, 6, 0, &canmioclk_lock);
+ can_mio_mux_parents, 54, CLK_SET_RATE_PARENT |
+ CLK_SET_RATE_NO_REPARENT, SLCR_CAN_MIOCLK_CTRL, 0, 6, 0,
+ &canmioclk_lock);
clk = clk_register_mux(NULL, "can1_mio_mux",
- can_mio_mux_parents, 54, CLK_SET_RATE_PARENT,
- SLCR_CAN_MIOCLK_CTRL, 16, 6, 0, &canmioclk_lock);
+ can_mio_mux_parents, 54, CLK_SET_RATE_PARENT |
+ CLK_SET_RATE_NO_REPARENT, SLCR_CAN_MIOCLK_CTRL, 16, 6,
+ 0, &canmioclk_lock);
clks[can0] = clk_register_mux(NULL, clk_output_name[can0],
- can0_mio_mux2_parents, 2, CLK_SET_RATE_PARENT,
- SLCR_CAN_MIOCLK_CTRL, 6, 1, 0, &canmioclk_lock);
+ can0_mio_mux2_parents, 2, CLK_SET_RATE_PARENT |
+ CLK_SET_RATE_NO_REPARENT, SLCR_CAN_MIOCLK_CTRL, 6, 1, 0,
+ &canmioclk_lock);
clks[can1] = clk_register_mux(NULL, clk_output_name[can1],
- can1_mio_mux2_parents, 2, CLK_SET_RATE_PARENT,
- SLCR_CAN_MIOCLK_CTRL, 22, 1, 0, &canmioclk_lock);
+ can1_mio_mux2_parents, 2, CLK_SET_RATE_PARENT |
+ CLK_SET_RATE_NO_REPARENT, SLCR_CAN_MIOCLK_CTRL, 22, 1,
+ 0, &canmioclk_lock);
for (i = 0; i < ARRAY_SIZE(dbgtrc_emio_input_names); i++) {
int idx = of_property_match_string(np, "clock-names",
@@ -441,13 +453,15 @@ static void __init zynq_clk_setup(struct device_node *np)
dbg_emio_mux_parents[i + 1] = of_clk_get_parent_name(np,
idx);
}
- clk = clk_register_mux(NULL, "dbg_mux", periph_parents, 4, 0,
- SLCR_DBG_CLK_CTRL, 4, 2, 0, &dbgclk_lock);
+ clk = clk_register_mux(NULL, "dbg_mux", periph_parents, 4,
+ CLK_SET_RATE_NO_REPARENT, SLCR_DBG_CLK_CTRL, 4, 2, 0,
+ &dbgclk_lock);
clk = clk_register_divider(NULL, "dbg_div", "dbg_mux", 0,
SLCR_DBG_CLK_CTRL, 8, 6, CLK_DIVIDER_ONE_BASED |
CLK_DIVIDER_ALLOW_ZERO, &dbgclk_lock);
- clk = clk_register_mux(NULL, "dbg_emio_mux", dbg_emio_mux_parents, 2, 0,
- SLCR_DBG_CLK_CTRL, 6, 1, 0, &dbgclk_lock);
+ clk = clk_register_mux(NULL, "dbg_emio_mux", dbg_emio_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT, SLCR_DBG_CLK_CTRL, 6, 1, 0,
+ &dbgclk_lock);
clks[dbg_trc] = clk_register_gate(NULL, clk_output_name[dbg_trc],
"dbg_emio_mux", CLK_SET_RATE_PARENT, SLCR_DBG_CLK_CTRL,
0, 0, &dbgclk_lock);