linux-kernel - Re: [PATCH RESEND] mfd: Add Freescale i.MX8qxp Control and Status Registers (CSR) module driver

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Message-ID: <Y1/sUfeVy1a6EKZQ@google.com>
Date:   Mon, 31 Oct 2022 15:40:01 +0000
From:   Lee Jones <lee@...nel.org>
To:     Liu Ying <victor.liu@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com
Subject: Re: [PATCH RESEND] mfd: Add Freescale i.MX8qxp Control and Status
 Registers (CSR) module driver

On Mon, 17 Oct 2022, Liu Ying wrote:

> Freescale i.MX8qxp Control and Status Registers (CSR) module is a system
> controller. It represents a set of miscellaneous registers of a specific
> subsystem. It may provide control and/or status report interfaces to a
> mix of standalone hardware devices within that subsystem.
> 
> The CSR module in i.MX8qm/qxp SoCs is a child node of a simple power-managed
> bus(i.MX8qxp pixel link MSI bus). To propagate power management operations
> of the CSR module's child devices to that simple power-managed bus, add a
> dedicated driver for the CSR module. Also, the driver would populate the CSR
> module's child devices.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> The Freescale i.MX8qxp CSR DT bindings is at
> Documentation/devicetree/bindings/mfd/fsl,imx8qxp-csr.yaml.
> 
> Resend the patch based on v6.1-rc1.
> 
>  drivers/mfd/Kconfig           | 10 +++++++
>  drivers/mfd/Makefile          |  1 +
>  drivers/mfd/fsl-imx8qxp-csr.c | 53 +++++++++++++++++++++++++++++++++++
>  3 files changed, 64 insertions(+)
>  create mode 100644 drivers/mfd/fsl-imx8qxp-csr.c
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 8b93856de432..966a250d7910 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -499,6 +499,16 @@ config MFD_MX25_TSADC
>  	  i.MX25 processors. They consist of a conversion queue for general
>  	  purpose ADC and a queue for Touchscreens.
>  
> +config MFD_MX8QXP_CSR
> +	tristate "Freescale i.MX8qxp Control and Status Registers (CSR) Module"
> +	depends on (ARCH_MXC && OF) || COMPILE_TEST
> +	help
> +	  Enable support for Freescale i.MX8qm/qxp Control and Status Registers
> +	  (CSR) Module. As a system controller, CSR represents a set of
> +	  miscellaneous registers of a specific subsystem. It may provide
> +	  control and/or status report interfaces to a mix of standalone
> +	  hardware devices within that subsystem.
> +
>  config MFD_HI6421_PMIC
>  	tristate "HiSilicon Hi6421 PMU/Codec IC"
>  	depends on OF
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 7ed3ef4a698c..5c3c13d7ce85 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -113,6 +113,7 @@ obj-$(CONFIG_MFD_TWL4030_AUDIO)	+= twl4030-audio.o
>  obj-$(CONFIG_TWL6040_CORE)	+= twl6040.o
>  
>  obj-$(CONFIG_MFD_MX25_TSADC)	+= fsl-imx25-tsadc.o
> +obj-$(CONFIG_MFD_MX8QXP_CSR)	+= fsl-imx8qxp-csr.o
>  
>  obj-$(CONFIG_MFD_MC13XXX)	+= mc13xxx-core.o
>  obj-$(CONFIG_MFD_MC13XXX_SPI)	+= mc13xxx-spi.o
> diff --git a/drivers/mfd/fsl-imx8qxp-csr.c b/drivers/mfd/fsl-imx8qxp-csr.c
> new file mode 100644
> index 000000000000..3915d3d6ca65
> --- /dev/null
> +++ b/drivers/mfd/fsl-imx8qxp-csr.c
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2022 NXP
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +
> +static int imx8qxp_csr_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +
> +	pm_runtime_enable(&pdev->dev);
> +
> +	ret = devm_of_platform_populate(&pdev->dev);

The use of this API does not constitute a MFD.

Please use "simple-mfd" instead.

> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed to populate sub-devices: %d\n", ret);
> +		pm_runtime_disable(&pdev->dev);
> +	}
> +
> +	return ret;
> +}
> +
> +static int imx8qxp_csr_remove(struct platform_device *pdev)
> +{
> +	pm_runtime_disable(&pdev->dev);
> +	return 0;
> +}
> +
> +static const struct of_device_id imx8qxp_csr_of_match[] = {
> +	{ .compatible = "fsl,imx8qxp-mipi-lvds-csr", },
> +	{ .compatible = "fsl,imx8qm-lvds-csr", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx8qxp_csr_of_match);
> +
> +static struct platform_driver imx8qxp_csr_driver = {
> +	.probe = imx8qxp_csr_probe,
> +	.remove = imx8qxp_csr_remove,
> +	.driver = {
> +		.name = "imx8qxp-csr",
> +		.of_match_table = imx8qxp_csr_of_match,
> +	},
> +};
> +
> +module_platform_driver(imx8qxp_csr_driver);
> +
> +MODULE_DESCRIPTION("Freescale i.MX8qm/qxp Control and Status Registers Module Driver");
> +MODULE_AUTHOR("Liu Ying <victor.liu@....com>");
> +MODULE_LICENSE("GPL v2");

-- 
Lee Jones [李琼斯]