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clk: mvebu: extend common code to allow an optional refclk 

The Armada 39x, contrary to its predecessor, has a configurable
reference clock frequency, of either 25 Mhz, or 40 Mhz. For the
previous SoCs, it was fixed to 25 Mhz and described directly as such
in the Device Tree.

For Armada 39x, we need to read certain registers to know whether the
frequency is 25 or 40 Mhz. Therefore, this commit extends the common
mvebu clock code to allow the SoC-specific code to say it wants to
register a reference clock, by giving a non-NULL ->get_refclk_freq()
function pointer in its coreclk_soc_desc structure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2015-03-03 15:41:08 +01:00 committed by Gregory CLEMENT
parent 9baf968867
commit 42b5f40610
2 changed files with 18 additions and 0 deletions
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17
drivers/clk/mvebu/common.c
View File

@ -121,6 +121,11 @@ void __init mvebu_coreclk_setup(struct device_node *np,
/* Allocate struct for TCLK, cpu clk, and core ratio clocks */
clk_data.clk_num = 2 + desc->num_ratios;
/* One more clock for the optional refclk */
if (desc->get_refclk_freq)
clk_data.clk_num += 1;
clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *),
GFP_KERNEL);
if (WARN_ON(!clk_data.clks)) {
@ -162,6 +167,18 @@ void __init mvebu_coreclk_setup(struct device_node *np,
WARN_ON(IS_ERR(clk_data.clks[2+n]));
};
/* Register optional refclk */
if (desc->get_refclk_freq) {
const char *name = "refclk";
of_property_read_string_index(np, "clock-output-names",
2 + desc->num_ratios, &name);
rate = desc->get_refclk_freq(base);
clk_data.clks[2 + desc->num_ratios] =
clk_register_fixed_rate(NULL, name, NULL,
CLK_IS_ROOT, rate);
WARN_ON(IS_ERR(clk_data.clks[2 + desc->num_ratios]));
}
/* SAR register isn't needed anymore */
iounmap(base);

1
drivers/clk/mvebu/common.h
View File

@ -30,6 +30,7 @@ struct coreclk_soc_desc {
u32 (*get_tclk_freq)(void __iomem *sar);
u32 (*get_cpu_freq)(void __iomem *sar);
void (*get_clk_ratio)(void __iomem *sar, int id, int *mult, int *div);
u32 (*get_refclk_freq)(void __iomem *sar);
bool (*is_sscg_enabled)(void __iomem *sar);
u32 (*fix_sscg_deviation)(u32 system_clk);
const struct coreclk_ratio *ratios;