Hi Sudeep,
Thanks for the feedback. I replied inline
>-----Original Message-----
>From: Sudeep Holla <sudeep.ho...@arm.com>
>Sent: Wednesday, October 7, 2020 6:11 PM
>To: Michal Simek <michal.si...@xilinx.com>
>Cc: Zulkifli, Muhammad Husaini <muhammad.husaini.zulki...@intel.com>;
>Hunter, Adrian <adrian.hun...@intel.com>; Sudeep Holla
><sudeep.ho...@arm.com>; ulf.hans...@linaro.org; linux-
>m...@vger.kernel.org; linux-arm-ker...@lists.infradead.org; linux-
>ker...@vger.kernel.org; Raja Subramanian, Lakshmi Bai
><lakshmi.bai.raja.subraman...@intel.com>; Wan Mohamad, Wan Ahmad
>Zainie <wan.ahmad.zainie.wan.moha...@intel.com>; a...@arndb.de
>Subject: Re: [PATCH v3 2/2] firmware: Keem Bay: Add support for Arm Trusted
>Firmware Service call
>
>On Wed, Oct 07, 2020 at 10:20:21AM +0200, Michal Simek wrote:
>> Hi,
>>
>> 1. Keem Bay: in subject is wrong. Tools are working with it and you
>> should just use keembay: instead.
>>
>> 2. This should come first before actual change to keep the tree bisectable.
>>
>> On 06. 10. 20 17:55, muhammad.husaini.zulki...@intel.com wrote:
>> > From: Muhammad Husaini Zulkifli
>> > <muhammad.husaini.zulki...@intel.com>
>> >
>> > Add header file to handle API function for device driver to
>> > communicate with Arm Trusted Firmware.
>> >
>> > Signed-off-by: Muhammad Husaini Zulkifli
>> > <muhammad.husaini.zulki...@intel.com>
>> > ---
>> > .../linux/firmware/intel/keembay_firmware.h | 46 +++++++++++++++++++
>> > 1 file changed, 46 insertions(+)
>> > create mode 100644 include/linux/firmware/intel/keembay_firmware.h
>> >
>> > diff --git a/include/linux/firmware/intel/keembay_firmware.h
>> > b/include/linux/firmware/intel/keembay_firmware.h
>> > new file mode 100644
>> > index 000000000000..9adb8c87b788
>> > --- /dev/null
>> > +++ b/include/linux/firmware/intel/keembay_firmware.h
>> > @@ -0,0 +1,46 @@
>> > +/* SPDX-License-Identifier: GPL-2.0 */
>> > +/*
>> > + * Intel Keembay SOC Firmware API Layer
>> > + *
>> > + * Copyright (C) 2020-2021, Intel Corporation
>> > + *
>> > + * Muhammad Husaini Zulkifli <muhammad.husaini.zulki...@intel.com>
>> > + */
>> > +
>> > +#ifndef __FIRMWARE_KEEMBAY_SMC_H__
>> > +#define __FIRMWARE_KEEMBAY_SMC_H__
>> > +
>> > +#include <linux/arm-smccc.h>
>> > +
>> > +/**
>>
>> This is not a kernel doc comment. Just use /*
>>
>> > + * This file defines API function that can be called by device
>> > + driver in order to
>> > + * communicate with Arm Trusted Firmware.
>> > + */
>> > +
>> > +/* Setting for Keem Bay IO Pad Line Voltage Selection */
>> > +#define KEEMBAY_SET_SD_VOLTAGE_FUNC_ID 0x8200ff26
>>
>> Sudeep: Don't we have any macros for composing these IDs?
>> nit: IMHO composing these IDs from macros would make more sense to me.
>>
>
>Yes we do. Refer include/linux/arm-smccc.h I expect something like below,
>which also indicated you are using wrong OWNER space. You can't be 0 which is
>reserved for CPU ARCH. You need to be SIP(0x2)
>
>#define ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE \
> ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
> ARM_SMCCC_SMC_32, \
> ARM_SMCCC_OWNER_SIP, \
> 0xFF26)
>
>
>--
Testing with below func and definition. It is working .
#define ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
ARM_SMCCC_OWNER_SIP, \
0xFF26)
int keembay_sd_voltage_selection(int volt)
{
struct arm_smccc_res res;
arm_smccc_1_1_invoke(ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE, volt, &res);
if ((int)res.a0 < 0)
return -EINVAL;
return 0;
}
>Regards,
>Sudeep
