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clk: at91: add PMC programmable clocks

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This patch adds new at91 programmable clocks implementation using common clk
framework.
A programmable clock is a clock which can be exported on a given pin to clock
external devices.
Each programmable clock is given an id (from 0 to 8).
The number of available programmable clocks depends on the SoC you're using.
Programmable clock driver only implements the clock setting (clock rate and
parent setting). It must be chained to a system clock in order to
enable/disable the generated clock.
The PCKX pins used to output the clock signals must be assigned to the
appropriate peripheral (see atmel's datasheets).

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Boris BREZILLON
2013-10-11 11:57:04 +02:00
committed by Nicolas Ferre
parent 6114067e43
commit 1f22f8bb64
4 changed files with 392 additions and 0 deletions
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9
drivers/clk/at91/pmc.h
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@@ -85,4 +85,13 @@ extern void __init of_at91rm9200_clk_periph_setup(struct device_node *np,
extern void __init of_at91sam9x5_clk_periph_setup(struct device_node *np,
struct at91_pmc *pmc);
#if defined(CONFIG_AT91_PROGRAMMABLE_CLOCKS)
extern void __init of_at91rm9200_clk_prog_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9g45_clk_prog_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9x5_clk_prog_setup(struct device_node *np,
struct at91_pmc *pmc);
#endif
#endif /* __PMC_H_ */