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SubjectRe: [PATCH v2 5/5] reset: Add support for resets provided by SCMI
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On Tue, 2019-08-06 at 18:02 +0100, Sudeep Holla wrote:
> On some ARM based systems, a separate Cortex-M based System Control
> Processor(SCP) provides the overall power, clock, reset and system
> control. System Control and Management Interface(SCMI) Message Protocol
> is defined for the communication between the Application Cores(AP)
> and the SCP.
>
> Adds support for the resets provided using SCMI protocol for performing
> reset management of various devices present on the SoC. Various reset
> functionalities are achieved by the means of different ARM SCMI device
> operations provided by the ARM SCMI framework.
>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> MAINTAINERS | 1 +
> drivers/reset/Kconfig | 11 ++++
> drivers/reset/Makefile | 1 +
> drivers/reset/reset-scmi.c | 126 +++++++++++++++++++++++++++++++++++++
> 4 files changed, 139 insertions(+)
> create mode 100644 drivers/reset/reset-scmi.c
>
> v1->v2:
> - Renamed RESET_ARM_SCMI to RESET_SCMI and reworded Kconfig text
> - Dropped unused struct device pointer from scmi_reset_data
> - Added to_scmi_handle which helped to remove some repetitive code
> - Fixed some doxygen comments
> - Initialised rcdev.nr_resets
> - Fixed MODULE_DESCRIPTION
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6426db5198f0..f4af5c59c116 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15545,6 +15545,7 @@ F: drivers/clk/clk-sc[mp]i.c
> F: drivers/cpufreq/sc[mp]i-cpufreq.c
> F: drivers/firmware/arm_scpi.c
> F: drivers/firmware/arm_scmi/
> +F: drivers/reset/reset-scmi.c
> F: include/linux/sc[mp]i_protocol.h
>
> SYSTEM RESET/SHUTDOWN DRIVERS
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 21efb7d39d62..4178ac11ba85 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -116,6 +116,17 @@ config RESET_QCOM_PDC
> to control reset signals provided by PDC for Modem, Compute,
> Display, GPU, Debug, AOP, Sensors, Audio, SP and APPS.
>
> +config RESET_SCMI
> + tristate "Reset driver controlled via ARM SCMI interface"
> + depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
> + default ARM_SCMI_PROTOCOL
> + help
> + This driver provides support for reset signal/domains that are
> + controlled by firmware that implements the SCMI interface.
> +
> + This driver uses SCMI Message Protocol to interact with the
> + firmware controlling all the reset signals.
> +
> config RESET_SIMPLE
> bool "Simple Reset Controller Driver" if COMPILE_TEST
> default ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARCH_ASPEED || ARCH_BITMAIN
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index 61456b8f659c..cf60ce526064 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -18,6 +18,7 @@ obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
> obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
> obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
> obj-$(CONFIG_RESET_QCOM_PDC) += reset-qcom-pdc.o
> +obj-$(CONFIG_RESET_SCMI) += reset-scmi.o
> obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
> obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
> obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o
> diff --git a/drivers/reset/reset-scmi.c b/drivers/reset/reset-scmi.c
> new file mode 100644
> index 000000000000..5e976a02a6cc
> --- /dev/null
> +++ b/drivers/reset/reset-scmi.c
> @@ -0,0 +1,126 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ARM System Control and Management Interface (ARM SCMI) reset driver
> + *
> + * Copyright (C) 2019 ARM Ltd.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/mutex.h>

You can drop mutex.h, it is unused.

> +#include <linux/of.h>
> +#include <linux/platform_device.h>

This is not a platform device driver. Better replace this with

#include <linux/device.h>

> +#include <linux/reset-controller.h>
> +#include <linux/scmi_protocol.h>
> +
> +/**
> + * struct scmi_reset_data - reset controller information structure
> + * @rcdev: reset controller entity
> + * @handle: ARM SCMI handle used for communication with system controller
> + * @dev: reset controller device pointer

Drop this line, dev has been removed from struct scmi_reset_data.

> + */
> +struct scmi_reset_data {
> + struct reset_controller_dev rcdev;
> + const struct scmi_handle *handle;
> +};
> +
> +#define to_scmi_reset_data(p) container_of((p), struct scmi_reset_data, rcdev)
> +#define to_scmi_handle(p) (to_scmi_reset_data(p)->handle)
[...]

Apart from these,
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>

regards
Philipp

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