On 27/10/2016 at 11:27:25 +0530, Keerthy wrote :
> From: Lokesh Vutla <lokeshvutla@xxxxxx>
>
> RTC can be clocked from an external 32KHz oscillator, or from the
> Peripheral PLL. The RTC has an internal oscillator buffer to support
> direct operation with a crystal.
>
> ----------------------------------------
> | Device --------- |
> | | | |
> | | RTCSS | |
> | --------- | | |
> OSC |<------| RTC | | | |
> |------>| OSC |--- | | |
> | -------- | | | |
> | ----|clk | |
> | -------- | | | |
> | | PRCM |--- | | |
> | -------- -------- |
> ----------------------------------------
>
> The RTC functional clock is sourced by default from the clock derived
> from the Peripheral PLL. In order to select source as external osc clk
> the following changes needs to be done:
> - Enable the RTC OSC (RTC_OSC_REG[4]OSC32K_GZ = 0)
> - Enable the clock mux(RTC_OSC_REG[6]K32CLK_EN = 1)
> - Select the external clock source (RTC_OSC_REG[3]32KCLK_SEL = 1)
>
> Fixes: 399cf0f63f6f2 ("rtc: omap: Add external clock enabling support")
> Signed-off-by: Keerthy <j-keerthy@xxxxxx>
> Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
> Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
> ---
>
> Boot tested and checked for rtc ticking on am335x-boneblack, am335x-bone
> am437x-gp-evm, dra7-evm, dra72-evm.
>
> drivers/rtc/rtc-omap.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
Both applied, thanks.
--
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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