linux-kernel - Re: [PATCH v2 5/5] arm/arm64: smccc: Add ARCH_SOC

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Message-ID: <20200505162049.GG24239@willie-the-truck>
Date:   Tue, 5 May 2020 17:20:50 +0100
From:   Will Deacon <will@...nel.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Steven Price <steven.price@....com>,
        linux-kernel@...r.kernel.org, harb@...erecomputing.com
Subject: Re: [PATCH v2 5/5] arm/arm64: smccc: Add ARCH_SOC_ID support

On Mon, May 04, 2020 at 10:29:05AM +0100, Sudeep Holla wrote:
> diff --git a/drivers/firmware/psci/soc_id.c b/drivers/firmware/psci/soc_id.c
> new file mode 100644
> index 000000000000..b45f2d78e12e
> --- /dev/null
> +++ b/drivers/firmware/psci/soc_id.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020 Arm Limited
> + */
> +
> +#include <linux/arm-smccc.h>
> +#include <linux/bitfield.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/sys_soc.h>
> +
> +#define SMCCC_SOC_ID_JEP106_BANK_IDX_MASK	GENMASK(30, 24)
> +/*
> + * As per the spec bits[23:16] are JEP-106 identification code with parity bit
> + * for the SiP. We can drop the parity bit.
> + */

Which spec? Could you link to the doc and section here, please?

Will