linux-kernel - Re: [PATCH V7 3/3] rtc: zynqmp: Updated calibration value

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Date:   Fri, 10 Jun 2022 14:03:55 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Srinivas Neeli <srinivas.neeli@...inx.com>
Cc:     a.zummo@...ertech.it, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, michal.simek@...inx.com,
        sgoud@...inx.com, shubhraj@...inx.com, srinivas.neeli@....com,
        neelisrinivas18@...il.com, devicetree@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, git@...inx.com
Subject: Re: [PATCH V7 3/3] rtc: zynqmp: Updated calibration value

On 10/06/2022 17:07:09+0530, Srinivas Neeli wrote:
> As per RTC spec default calibration value is 0x7FFF.
> 

Having that as a second patch breaks the calculation in your previous
patch, really, this should just be a single patch.

> Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> ---
> Changes in V7:
> -New patch
> -TRM not updated yet, Internal design document contains 0x7FFF as
>  default value. TRM Will update in next release.
> ---
>  drivers/rtc/rtc-zynqmp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
> index 39b23f88ee26..1dd389b891fe 100644
> --- a/drivers/rtc/rtc-zynqmp.c
> +++ b/drivers/rtc/rtc-zynqmp.c
> @@ -37,7 +37,7 @@
>  #define RTC_OSC_EN		BIT(24)
>  #define RTC_BATT_EN		BIT(31)
>  
> -#define RTC_CALIB_DEF		0x198233
> +#define RTC_CALIB_DEF		0x7FFF
>  #define RTC_CALIB_MASK		0x1FFFFF
>  #define RTC_ALRM_MASK          BIT(1)
>  #define RTC_MSEC               1000
> -- 
> 2.25.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com