linux-kernel - Re: [PATCH v13 3/9] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a

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Message-ID: <YXFOh6nubOYKv5ua@google.com>
Date:   Thu, 21 Oct 2021 12:27:03 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     robh+dt@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
        kernel@...gutronix.de, shawnguo@...nel.org, s.hauer@...gutronix.de,
        linux-imx@....com, amitk@...nel.org, rui.zhang@...el.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        alistair23@...il.com, linux-hwmon@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v13 3/9] mfd: simple-mfd-i2c: Enable support for the
 silergy,sy7636a

On Fri, 15 Oct 2021, Alistair Francis wrote:

> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/simple-mfd-i2c.c | 12 +++++++++++
>  include/linux/mfd/sy7636a.h  | 41 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 53 insertions(+)
>  create mode 100644 include/linux/mfd/sy7636a.h
> 
> diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
> index 51536691ad9d..fbc6d6aed6c0 100644
> --- a/drivers/mfd/simple-mfd-i2c.c
> +++ b/drivers/mfd/simple-mfd-i2c.c
> @@ -62,8 +62,20 @@ static int simple_mfd_i2c_probe(struct i2c_client *i2c)
>  	return ret;
>  }
>  
> +static const struct mfd_cell sy7636a_cells[] = {
> +	{ .name = "sy7636a-regulator", },
> +	{ .name = "sy7636a-temperature", },
> +	{ .name = "sy7636a-thermal", },
> +};
> +
> +static const struct simple_mfd_data silergy_sy7636a = {
> +	.mfd_cell = sy7636a_cells,
> +	.mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
> +};
> +
>  static const struct of_device_id simple_mfd_i2c_of_match[] = {
>  	{ .compatible = "kontron,sl28cpld" },
> +	{ .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
> diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h
> new file mode 100644
> index 000000000000..15caa54f0432
> --- /dev/null
> +++ b/include/linux/mfd/sy7636a.h
> @@ -0,0 +1,41 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Functions to access SY3686A power management chip.
> + *
> + * Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
> + */
> +
> +#ifndef __MFD_SY7636A_H
> +#define __MFD_SY7636A_H
> +
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>

Why are these needed?

> +#define SY7636A_REG_OPERATION_MODE_CRL		0x00
> +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL	BIT(6)
> +#define SY7636A_OPERATION_MODE_CRL_ONOFF	BIT(7)
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_L		0x01
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_H		0x02
> +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK	0x01ff
> +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL	0x03
> +#define SY7636A_REG_POWER_ON_DELAY_TIME		0x06
> +#define SY7636A_REG_FAULT_FLAG			0x07
> +#define SY7636A_FAULT_FLAG_PG			BIT(0)
> +#define SY7636A_REG_TERMISTOR_READOUT		0x08
> +
> +#define SY7636A_REG_MAX				0x08
> +
> +#define VCOM_MIN		0
> +#define VCOM_MAX		5000
> +
> +#define VCOM_ADJUST_CTRL_MASK	0x1ff
> +// Used to shift the high byte
> +#define VCOM_ADJUST_CTRL_SHIFT	8
> +// Used to scale from VCOM_ADJUST_CTRL to mv
> +#define VCOM_ADJUST_CTRL_SCAL	10000
> +
> +#define FAULT_FLAG_SHIFT	1
> +
> +#endif /* __LINUX_MFD_SY7636A_H */

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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