linux-kernel - Re: [PATCH v4 1/4] firmware: keembay: Add support for Arm Trusted Firmware Service call

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Date:   Thu, 8 Oct 2020 09:35:33 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     muhammad.husaini.zulkifli@...el.com, adrian.hunter@...el.com,
        michal.simek@...inx.com, andriy.shevchenko@...el.com,
        ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     lakshmi.bai.raja.subramanian@...el.com,
        wan.ahmad.zainie.wan.mohamad@...el.com, arnd@...db.de
Subject: Re: [PATCH v4 1/4] firmware: keembay: Add support for Arm Trusted
 Firmware Service call



On 08. 10. 20 4:09, muhammad.husaini.zulkifli@...el.com wrote:
> From: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.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.zulkifli@...el.com>
> ---
>  .../linux/firmware/intel/keembay_firmware.h   | 47 +++++++++++++++++++
>  1 file changed, 47 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..8a62abcdfead
> --- /dev/null
> +++ b/include/linux/firmware/intel/keembay_firmware.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + *  Intel Keembay SOC Firmware API Layer
> + *
> + *  Copyright (C) 2020-2021, Intel Corporation
> + *
> + *  Muhammad Husaini Zulkifli <Muhammad.Husaini.Zulkifli@...el.com>
> + */
> +
> +#ifndef __FIRMWARE_KEEMBAY_SMC_H__
> +#define __FIRMWARE_KEEMBAY_SMC_H__
> +
> +#include <linux/arm-smccc.h>
> +
> +/*
> + * 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 ARM_SMCCC_SIP_KEEMBAY_SET_SD_VOLTAGE		\
> +	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,		\
> +			   ARM_SMCCC_SMC_32,		\
> +			   ARM_SMCCC_OWNER_SIP,		\
> +			   0xFF26)
> +
> +#define KEEMBAY_SET_1V8_VOLT	1
> +#define KEEMBAY_SET_3V3_VOLT	0
> +
> +#if IS_ENABLED(CONFIG_HAVE_ARM_SMCCC_DISCOVERY)
> +static inline 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;
> +}
> +#else
> +static inline int keembay_sd_voltage_selection(int volt)
> +{
> +	return -ENODEV;
> +}
> +#endif
> +#endif /* __FIRMWARE_KEEMBAY_SMC_H__ */
> 

This looks good to me.

Acked-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal