linux-kernel - Re: [PATCH v5 3/4] firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support

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Date: Fri, 15 Mar 2024 16:58:07 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Sudeep Holla <sudeep.holla@....com>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Oleksii Moisieiev <oleksii_moisieiev@...m.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v5 3/4] firmware: arm_scmi: Add SCMI v3.2 pincontrol
 protocol basic support

On Thu, Mar 14, 2024 at 09:35:20PM +0800, Peng Fan (OSS) wrote:
> From: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
> 
> Add basic implementation of the SCMI v3.2 pincontrol protocol.
> 
> Reviewed-by: Cristian Marussi <cristian.marussi@....com>
> Tested-by: Cristian Marussi <cristian.marussi@....com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
> Co-developed-by: Peng Fan <peng.fan@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/firmware/arm_scmi/Makefile    |   1 +
>  drivers/firmware/arm_scmi/driver.c    |   2 +
>  drivers/firmware/arm_scmi/pinctrl.c   | 908 ++++++++++++++++++++++++++++++++++
>  drivers/firmware/arm_scmi/protocols.h |   1 +
>  include/linux/scmi_protocol.h         |  75 +++
>  5 files changed, 987 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
> index a7bc4796519c..8e3874ff1544 100644
> --- a/drivers/firmware/arm_scmi/Makefile
> +++ b/drivers/firmware/arm_scmi/Makefile
> @@ -11,6 +11,7 @@ scmi-transport-$(CONFIG_ARM_SCMI_HAVE_MSG) += msg.o
>  scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_VIRTIO) += virtio.o
>  scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_OPTEE) += optee.o
>  scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o voltage.o powercap.o
> +scmi-protocols-y += pinctrl.o
>  scmi-module-objs := $(scmi-driver-y) $(scmi-protocols-y) $(scmi-transport-y)
>  
>  obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 415e6f510057..ac2d4b19727c 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -3142,6 +3142,7 @@ static int __init scmi_driver_init(void)
>  	scmi_voltage_register();
>  	scmi_system_register();
>  	scmi_powercap_register();
> +	scmi_pinctrl_register();
>  
>  	return platform_driver_register(&scmi_driver);
>  }
> @@ -3159,6 +3160,7 @@ static void __exit scmi_driver_exit(void)
>  	scmi_voltage_unregister();
>  	scmi_system_unregister();
>  	scmi_powercap_unregister();
> +	scmi_pinctrl_unregister();
>  
>  	scmi_transports_exit();
>  
> diff --git a/drivers/firmware/arm_scmi/pinctrl.c b/drivers/firmware/arm_scmi/pinctrl.c
> new file mode 100644
> index 000000000000..0fcfa4269473
> --- /dev/null
> +++ b/drivers/firmware/arm_scmi/pinctrl.c
> @@ -0,0 +1,908 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * System Control and Management Interface (SCMI) Pinctrl Protocol
> + *
> + * Copyright (C) 2024 EPAM
> + * Copyright 2024 NXP
> + */
> +
> +#include <linux/module.h>
> +#include <linux/scmi_protocol.h>
> +#include <linux/slab.h>
> +
> +#include "common.h"
> +#include "protocols.h"
> +
> +/* Updated only after ALL the mandatory features for that version are merged */
> +#define SCMI_PROTOCOL_SUPPORTED_VERSION                0x0
> +
> +#define REG_TYPE_BITS GENMASK(9, 8)
> +#define REG_CONFIG GENMASK(7, 0)
> +
> +#define GET_GROUPS_NR(x)	le32_get_bits((x), GENMASK(31, 16))
> +#define GET_PINS_NR(x)		le32_get_bits((x), GENMASK(15, 0))
> +#define GET_FUNCTIONS_NR(x)	le32_get_bits((x), GENMASK(15, 0))
> +
> +#define EXT_NAME_FLAG(x)	le32_get_bits((x), BIT(31))
> +#define NUM_ELEMS(x)		le32_get_bits((x), GENMASK(15, 0))
> +
> +#define REMAINING(x)		le32_get_bits((x), GENMASK(31, 16))
> +#define RETURNED(x)		le32_get_bits((x), GENMASK(11, 0))
> +
> +enum scmi_pinctrl_protocol_cmd {
> +	PINCTRL_ATTRIBUTES = 0x3,
> +	PINCTRL_LIST_ASSOCIATIONS = 0x4,
> +	PINCTRL_CONFIG_GET = 0x5,
> +	PINCTRL_CONFIG_SET = 0x6,

These are now PINCTRL_SETTINGS_GET and PINCTRL_SETTINGS_CONFIGURE
with a bit of different payload and size....please also fix and rename
the related msg descriptos down below.

> +	PINCTRL_FUNCTION_SELECT = 0x7,
> +	PINCTRL_REQUEST = 0x8,
> +	PINCTRL_RELEASE = 0x9,
> +	PINCTRL_NAME_GET = 0xa,
> +	PINCTRL_SET_PERMISSIONS = 0xb
> +};
> +
> +struct scmi_msg_conf_set {
> +	__le32 identifier;

new field:

	__le32 function_id;

> +	__le32 attributes;
> +	__le32 configs[];
> +};
> +
> +struct scmi_msg_conf_get {
> +	__le32 identifier;
> +	__le32 attributes;
> +};
> +
> +struct scmi_resp_conf_get {

new field

	__le32 function_selected;

> +	__le32 num_configs;

> +	__le32 configs[];
> +};
> +

Thanks,
Cristian