Re: [PATCH v8 2/2] clocksource: Add Intel Keem Bay timer support
From: Daniel Lezcano
Date: Wed Mar 02 2022 - 11:26:51 EST
On 02/03/2022 17:07, Sanil, Shruthi wrote:
-----Original Message----- From: Daniel Lezcano
<daniel.lezcano@xxxxxxxxxx> Sent: Wednesday, March 2, 2022 3:54 PM
To: Sanil, Shruthi <shruthi.sanil@xxxxxxxxx>; tglx@xxxxxxxxxxxxx;
robh+dt@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
devicetree@xxxxxxxxxxxxxxx Cc: andriy.shevchenko@xxxxxxxxxxxxxxx;
mgross@xxxxxxxxxxxxxxx; Thokala, Srikanth
<srikanth.thokala@xxxxxxxxx>; Raja Subramanian, Lakshmi Bai
<lakshmi.bai.raja.subramanian@xxxxxxxxx>; Sangannavar,
Mallikarjunappa <mallikarjunappa.sangannavar@xxxxxxxxx> Subject:
Re: [PATCH v8 2/2] clocksource: Add Intel Keem Bay timer support
On 02/03/2022 11:12, Sanil, Shruthi wrote:
[ ... ]
+ if (!(val & TIM_CONFIG_PRESCALER_ENABLE)) { +
pr_err("%pOF: Prescaler is not enabled\n", np); + ret =
-ENODEV; + }
Why bail out instead of enabling the prescalar ?
Because it is a secure register and it would be updated by the
bootloader.
Should it be considered as a firmware bug ?
No. This is a common driver across products in the series and
enablement of this bit depends on the project requirements. Hence to
be sure from driver, we added this check to avoid initialization of
the driver in the case where it cannot be functional.
I'm not sure to get the meaning of 'project requirements' but (for my
understanding) why not describe the timer in the DT for such projects?
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