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SubjectRe: [PATCH v10 1/3] mfd: Add Renesas R-Car Gen3 RPC-IF MFD controller driver
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The patch name is somewhat misleading -- there's no "MFD controller".

On 04/15/2019 10:37 AM, Mason Yang wrote:

> Add a driver for Renesas R-Car Gen3 RPC-IF MFD controller.
>
> Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
[...]
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 26ad646..7914349 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -978,6 +978,15 @@ config MFD_RDC321X
> southbridge which provides access to GPIOs and Watchdog using the
> southbridge PCI device configuration space.
>
> +config MFD_RENESAS_RPC
> + tristate "Renesas R-Car Gen3 RPC-IF MFD driver"
> + select MFD_CORE
> + depends on ARCH_RENESAS
> + help
> + This supports for Renesas R-Car Gen3 RPC-IF multifunction device

"For" node needed here.

> + controller which provides either SPI host controller or HyperFlash.
> + You have to select individual components under the corresponding menu.
> +
> config MFD_RT5033
> tristate "Richtek RT5033 Power Management IC"
> depends on I2C
[...]
> diff --git a/drivers/mfd/renesas-rpc.c b/drivers/mfd/renesas-rpc.c
> new file mode 100644
> index 0000000..a565f31
> --- /dev/null
> +++ b/drivers/mfd/renesas-rpc.c
> @@ -0,0 +1,128 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
> +// Copyright (C) 2019 Macronix International Co., Ltd.
> +//
> +// R-Car Gen3 RPC-IF MFD driver
> +//
> +// Author:
> +// Mason Yang <masonccyang@mxic.com.tw>
> +//
> +
> +#include <linux/mfd/renesas-rpc.h>
> +#include <linux/mfd/core.h>
> +
> +static const struct mfd_cell rpc_hf_ctlr = {
> + .name = "rpc-hf",
> + .of_compatible = "renesas,rcar-rpc-hf",

Don't need this line any more...

> +};
> +
> +static const struct mfd_cell rpc_spi_ctlr = {
> + .name = "rpc-spi",
> + .of_compatible = "renesas,rcar-rpc-spi",

... and this too.

[...]
> +static int rpc_mfd_probe(struct platform_device *pdev)
> +{
> + struct device_node *flash;
> + const struct mfd_cell *cell;
> + struct resource *res;
> + struct rpc_mfd *rpc;
> + void __iomem *base;
> + int ret;
> +
> + flash = of_get_next_child(pdev->dev.of_node, NULL);
> + if (!flash) {
> + dev_warn(&pdev->dev, "no flash node found\n");
> + return -ENODEV;
> + }
> +
> + ret = of_device_is_compatible(flash, "jedec,spi-nor");
> + if (ret) {
> + cell = &rpc_spi_ctlr;
> + } else {
> + ret = of_device_is_compatible(flash, "cfi-flash");
> + if (ret) {
> + cell = &rpc_hf_ctlr;
> + } else {
> + dev_warn(&pdev->dev, "no jedec spi/cfi device found\n");
> + return -ENODEV;
> + }
> + }


This definitely should look simpler, like below:

if (of_device_is_compatible(flash, "jedec,spi-nor")) {
cell = &rpc_spi_ctlr;
} else if (of_device_is_compatible(flash, "cfi-flash")) {
cell = &rpc_hf_ctlr;
} else {
dev_warn(&pdev->dev, "unknown flash type\n");
return -ENODEV;
}

[...]

> + ret = devm_mfd_add_devices(&pdev->dev, -1, cell, 1, NULL, 0, NULL);
> +
> + return ret;

return devm_mfd_add_devices(&pdev->dev, -1, cell, 1, NULL, 0, NULL);

[...]
> diff --git a/include/linux/mfd/renesas-rpc.h b/include/linux/mfd/renesas-rpc.h
> new file mode 100644
> index 0000000..61ada14
> --- /dev/null
> +++ b/include/linux/mfd/renesas-rpc.h
> @@ -0,0 +1,153 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
> +// Copyright (C) 2019 Macronix International Co., Ltd.
> +//
> +// R-Car Gen3 RPC-IF MFD driver
> +//
> +// Author:
> +// Mason Yang <masonccyang@mxic.com.tw>
> +//
> +
> +#ifndef __MFD_RENESAS_RPC_H
> +#define __MFD_RENESAS_RPC_H
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/log2.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/of.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
NAK. I have already told you that these #include's are only needed in the
drivers, not in this header.

My idea is to contain all hardware manipulation in the MFD driver,
with SPI/HF drivers calling that code via a set of APIs declared in this header.
The registers (declared below) would end up only needed by that common MFD driver...

[...]

MBR, Sergei

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