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clk: at91: add slow clks driver

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AT91 slow clk is a clk multiplexer.

In some SoCs (sam9x5, sama5, sam9g45 families) this multiplexer can
choose among 2 sources: an internal RC oscillator circuit and an oscillator
using an external crystal.

In other Socs (sam9260 family) the multiplexer source is hardcoded with
the OSCSEL signal.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Boris BREZILLON
2014-05-07 18:02:15 +02:00
committed by Nicolas Ferre
parent f9e1716f91
commit 80eded6ce8
7 changed files with 557 additions and 2 deletions
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3
drivers/clk/at91/pmc.h
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@@ -58,6 +58,9 @@ static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range);
extern void __init of_at91sam9260_clk_slow_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91rm9200_clk_main_osc_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9x5_clk_main_rc_osc_setup(struct device_node *np,