linux-kernel - Re: [PATCH v6 02/11] firmware: xilinx: Add Zynqmp firmware driver

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Date:   Thu, 10 May 2018 15:04:46 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Jolly Shah <jolly.shah@...inx.com>, ard.biesheuvel@...aro.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        matt@...eblueprint.co.uk, hkallweit1@...il.com,
        keescook@...omium.org, dmitry.torokhov@...il.com,
        mturquette@...libre.com, sboyd@...eaurora.org,
        michal.simek@...inx.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-clk@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>, rajanv@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jolly Shah <jollys@...inx.com>
Subject: Re: [PATCH v6 02/11] firmware: xilinx: Add Zynqmp firmware driver



On 10/04/18 20:38, Jolly Shah wrote:
> From: Rajan Vaja <rajanv@...inx.com>
> 
> This patch is adding communication layer with firmware.
> Firmware driver provides an interface to firmware APIs.
> Interface APIs can be used by any driver to communicate to
> PMUFW(Platform Management Unit). All requests go through ATF.
> 
> Signed-off-by: Rajan Vaja <rajanv@...inx.com>
> Signed-off-by: Jolly Shah <jollys@...inx.com>
> ---

[...]

> +
> +/**
> + * get_set_conduit_method() - Choose SMC or HVC based communication
> + * @np:		Pointer to the device_node structure
> + *
> + * Use SMC or HVC-based functions to communicate with EL2/EL3.
> + *
> + * Return: Returns 0 on success or error code
> + */
> +static int get_set_conduit_method(struct device_node *np)
> +{
> +	const char *method;
> +
> +	if (of_property_read_string(np, "method", &method)) {
> +		pr_warn("%s missing \"method\" property\n", __func__);
> +		return -ENXIO;
> +	}
> +
> +	if (!strcmp("hvc", method)) {
> +		do_fw_call = do_fw_call_hvc;
> +	} else if (!strcmp("smc", method)) {
> +		do_fw_call = do_fw_call_smc;
> +	} else {
> +		pr_warn("%s Invalid \"method\" property: %s\n",
> +			__func__, method);
> +		return -EINVAL;
> +	}
> +

Mark R did some cleanup around SMCCC conduits[1]. It makes sense to base
this on top that. But if you manage to push this for v4.18, then you may
need to wait for that to be merged and clean it up after v4.18

-- 
Regards,
Sudeep

[1] https://www.spinics.net/lists/arm-kernel/msg650305.html