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Date: Thu, 24 Jun 2021 15:08:00 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linuxarm@...wei.com, mauro.chehab@...wei.com,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH RESEND v6 6/8] mfd: hi6421-spmi-pmic: move driver from
staging
On Thu, 24 Jun 2021, Mauro Carvalho Chehab wrote:
> Em Thu, 24 Jun 2021 12:33:28 +0100
> Lee Jones <lee.jones@...aro.org> escreveu:
>
> > On Thu, 24 Jun 2021, Mauro Carvalho Chehab wrote:
> >
> > > This driver is ready for mainstream. So, move it out of staging.
> > >
> > > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > > ---
> > > .../mfd/hisilicon,hi6421-spmi-pmic.yaml | 134 ++++++++
> > > MAINTAINERS | 7 +
> > > drivers/mfd/Kconfig | 16 +
> > > drivers/mfd/Makefile | 1 +
> > > drivers/mfd/hi6421-spmi-pmic.c | 316 ++++++++++++++++++
> > > drivers/staging/Kconfig | 2 -
> > > drivers/staging/Makefile | 1 -
> > > drivers/staging/hikey9xx/Kconfig | 19 --
> > > drivers/staging/hikey9xx/Makefile | 3 -
> > > drivers/staging/hikey9xx/TODO | 5 -
> > > drivers/staging/hikey9xx/hi6421-spmi-pmic.c | 316 ------------------
> > > .../hikey9xx/hisilicon,hi6421-spmi-pmic.yaml | 134 --------
> > > 12 files changed, 474 insertions(+), 480 deletions(-)
> > > create mode 100644 Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
> > > create mode 100644 drivers/mfd/hi6421-spmi-pmic.c
> > > delete mode 100644 drivers/staging/hikey9xx/Kconfig
> > > delete mode 100644 drivers/staging/hikey9xx/Makefile
> > > delete mode 100644 drivers/staging/hikey9xx/TODO
> > > delete mode 100644 drivers/staging/hikey9xx/hi6421-spmi-pmic.c
> > > delete mode 100644 drivers/staging/hikey9xx/hisilicon,hi6421-spmi-pmic.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml b/Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
> > > new file mode 100644
> > > index 000000000000..8e355cddd437
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
> > > @@ -0,0 +1,134 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/mfd/hisilicon,hi6421-spmi-pmic.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: HiSilicon 6421v600 SPMI PMIC
> > > +
> > > +maintainers:
> > > + - Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > > +
> > > +description: |
> > > + HiSilicon 6421v600 should be connected inside a MIPI System Power Management
> > > + (SPMI) bus. It provides interrupts and power supply.
> > > +
> > > + The GPIO and interrupt settings are represented as part of the top-level PMIC
> > > + node.
> > > +
> > > + The SPMI controller part is provided by
> > > + Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
> > > +
> > > +properties:
> > > + $nodename:
> > > + pattern: "pmic@[0-9a-f]"
> > > +
> > > + compatible:
> > > + const: hisilicon,hi6421v600-spmi
> > > +
> > > + reg:
> > > + maxItems: 1
> > > +
> > > + '#interrupt-cells':
> > > + const: 2
> > > +
> > > + interrupt-controller: true
> > > +
> > > + gpios:
> > > + maxItems: 1
> > > + description: GPIO used for IRQs
> > > +
> > > + regulators:
> > > + type: object
> > > +
> > > + properties:
> > > + '#address-cells':
> > > + const: 1
> > > +
> > > + '#size-cells':
> > > + const: 0
> > > +
> > > + patternProperties:
> > > + '^ldo[0-9]+@[0-9a-f]$':
> > > + type: object
> > > +
> > > + $ref: "/schemas/regulator/regulator.yaml#"
> > > +
> > > +required:
> > > + - compatible
> > > + - reg
> > > + - regulators
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > + - |
> > > + /* pmic properties */
> > > +
> > > + pmic: pmic@0 {
> > > + compatible = "hisilicon,hi6421-spmi";
> > > + reg = <0 0>;
> > > +
> > > + #interrupt-cells = <2>;
> > > + interrupt-controller;
> > > + gpios = <&gpio28 0 0>;
> > > +
> > > + regulators {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > +
> > > + ldo3: LDO3 {
> > > + regulator-name = "ldo3";
> > > + regulator-min-microvolt = <1500000>;
> > > + regulator-max-microvolt = <2000000>;
> > > + regulator-boot-on;
> > > + };
> > > +
> > > + ldo4: LDO4 {
> > > + regulator-name = "ldo4";
> > > + regulator-min-microvolt = <1725000>;
> > > + regulator-max-microvolt = <1900000>;
> > > + regulator-boot-on;
> > > + };
> > > +
> > > + ldo9: LDO9 {
> > > + regulator-name = "ldo9";
> > > + regulator-min-microvolt = <1750000>;
> > > + regulator-max-microvolt = <3300000>;
> > > + regulator-boot-on;
> > > + };
> > > +
> > > + ldo15: LDO15 {
> > > + regulator-name = "ldo15";
> > > + regulator-min-microvolt = <1800000>;
> > > + regulator-max-microvolt = <3000000>;
> > > + regulator-always-on;
> > > + };
> > > +
> > > + ldo16: LDO16 {
> > > + regulator-name = "ldo16";
> > > + regulator-min-microvolt = <1800000>;
> > > + regulator-max-microvolt = <3000000>;
> > > + regulator-boot-on;
> > > + };
> > > +
> > > + ldo17: LDO17 {
> > > + regulator-name = "ldo17";
> > > + regulator-min-microvolt = <2500000>;
> > > + regulator-max-microvolt = <3300000>;
> > > + };
> > > +
> > > + ldo33: LDO33 {
> > > + regulator-name = "ldo33";
> > > + regulator-min-microvolt = <2500000>;
> > > + regulator-max-microvolt = <3300000>;
> > > + regulator-boot-on;
> > > + };
> > > +
> > > + ldo34: LDO34 {
> > > + regulator-name = "ldo34";
> > > + regulator-min-microvolt = <2600000>;
> > > + regulator-max-microvolt = <3300000>;
> > > + };
> > > + };
> > > + };
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index 9a69e3810964..89e84b050de6 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -8291,6 +8291,13 @@ S: Maintained
> > > F: Documentation/devicetree/bindings/spmi/hisilicon,hisi-spmi-controller.yaml
> > > F: drivers/spmi/hisi-spmi-controller.c
> > >
> > > +HISILICON SPMI PMIC DRIVER FOR HIKEY 6421v600
> > > +M: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > > +L: linux-kernel@...r.kernel.org
> > > +S: Maintained
> > > +F: Documentation/devicetree/bindings/mfd/hisilicon,hi6421-spmi-pmic.yaml
> > > +F: drivers/mfd/hi6421-spmi-pmic.c
> > > +
> > > HISILICON STAGING DRIVERS FOR HIKEY 960/970
> > > M: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > > S: Maintained
> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index 5c7f2b100191..99b8da2548b5 100644
> > > --- a/drivers/mfd/Kconfig
> > > +++ b/drivers/mfd/Kconfig
> > > @@ -509,6 +509,22 @@ config MFD_HI6421_PMIC
> > > menus in order to enable them.
> > > We communicate with the Hi6421 via memory-mapped I/O.
> > >
> > > +config MFD_HI6421_SPMI
> > > + tristate "HiSilicon Hi6421v600 SPMI PMU/Codec IC"
> > > + depends on OF
> > > + depends on SPMI
> > > + select MFD_CORE
> > > + select REGMAP_SPMI
> > > + help
> > > + Add support for HiSilicon Hi6421v600 SPMI PMIC. Hi6421 includes
> > > + multi-functions, such as regulators, RTC, codec, Coulomb counter,
> > > + etc.
> > > +
> > > + This driver includes core APIs _only_. You have to select
> > > + individual components like voltage regulators under corresponding
> > > + menus in order to enable them.
> > > + We communicate with the Hi6421v600 via a SPMI bus.
> > > +
> > > config MFD_HI655X_PMIC
> > > tristate "HiSilicon Hi655X series PMU/Codec IC"
> > > depends on ARCH_HISI || COMPILE_TEST
> > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > > index 4f6d2b8a5f76..e87230fc61ac 100644
> > > --- a/drivers/mfd/Makefile
> > > +++ b/drivers/mfd/Makefile
> > > @@ -232,6 +232,7 @@ obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
> > > obj-$(CONFIG_MFD_IQS62X) += iqs62x.o
> > > obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
> > > obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
> > > +obj-$(CONFIG_MFD_HI6421_SPMI) += hi6421-spmi-pmic.o
> > > obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o
> > > obj-$(CONFIG_MFD_DLN2) += dln2.o
> > > obj-$(CONFIG_MFD_RT5033) += rt5033.o
> > > diff --git a/drivers/mfd/hi6421-spmi-pmic.c b/drivers/mfd/hi6421-spmi-pmic.c
> > > new file mode 100644
> > > index 000000000000..2b7172560df7
> > > --- /dev/null
> > > +++ b/drivers/mfd/hi6421-spmi-pmic.c
> > > @@ -0,0 +1,316 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Device driver for regulators in HISI PMIC IC
> > > + *
> > > + * Copyright (c) 2013 Linaro Ltd.
> > > + * Copyright (c) 2011 Hisilicon.
> > > + * Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
> >
> > Can this be updated?
>
> Do you mean updating the copyrights to cover this year? E.g.
> something like this:
>
> * Copyright (c) 2013-2021 Linaro Ltd.
> * Copyright (c) 2011-2021 Hisilicon.
> * Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
>
> Right? Or are you meaning something else?
Yes, that's it. I know this is just a move, but to MFD, it's new.
> Btw, this device is a variant of the already-existing devices
> provided by the hi6421-pmic-core, which has:
>
> * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
> * http://www.hisilicon.com
> * Copyright (c) <2013-2017> Linaro Ltd.
> * https://www.linaro.org
> *
>
> The main difference is that this device is connected via a
> SPMI bus (there are other differences on register settings and
> LDO/BUCK regulators).
>
> >
> > > + */
> > > +
> > > +#include <linux/bitops.h>
> > > +#include <linux/interrupt.h>
> > > +#include <linux/irq.h>
> > > +#include <linux/mfd/core.h>
> > > +#include <linux/mfd/hi6421-spmi-pmic.h>
> > > +#include <linux/module.h>
> > > +#include <linux/of_gpio.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/slab.h>
> > > +#include <linux/spmi.h>
> > > +
> > > +enum hi6421_spmi_pmic_irq_list {
> > > + OTMP = 0,
> > > + VBUS_CONNECT,
> > > + VBUS_DISCONNECT,
> > > + ALARMON_R,
> > > + HOLD_6S,
> > > + HOLD_1S,
> > > + POWERKEY_UP,
> > > + POWERKEY_DOWN,
> > > + OCP_SCP_R,
> > > + COUL_R,
> > > + SIM0_HPD_R,
> > > + SIM0_HPD_F,
> > > + SIM1_HPD_R,
> > > + SIM1_HPD_F,
> > > +
> > > + PMIC_IRQ_LIST_MAX
> > > +};
> > > +
> > > +#define HISI_IRQ_BANK_SIZE 2
> > > +
> > > +/*
> > > + * IRQ number for the power key button and mask for both UP and DOWN IRQs
> > > + */
> > > +#define HISI_POWERKEY_IRQ_NUM 0
> > > +#define HISI_IRQ_POWERKEY_UP_DOWN (BIT(POWERKEY_DOWN) | BIT(POWERKEY_UP))
> > > +
> > > +/*
> > > + * Registers for IRQ address and IRQ mask bits
> > > + *
> > > + * Please notice that we need to regmap a larger region, as other
> > > + * registers are used by the regulators.
> > > + * See drivers/regulator/hi6421-regulator.c.
> > > + */
> > > +#define SOC_PMIC_IRQ_MASK_0_ADDR 0x0202
> > > +#define SOC_PMIC_IRQ0_ADDR 0x0212
> > > +
> > > +/*
> > > + * The IRQs are mapped as:
> > > + *
> > > + * ====================== ============= ============ =====
> > > + * IRQ MASK REGISTER IRQ REGISTER BIT
> > > + * ====================== ============= ============ =====
> > > + * OTMP 0x0202 0x212 bit 0
> > > + * VBUS_CONNECT 0x0202 0x212 bit 1
> > > + * VBUS_DISCONNECT 0x0202 0x212 bit 2
> > > + * ALARMON_R 0x0202 0x212 bit 3
> > > + * HOLD_6S 0x0202 0x212 bit 4
> > > + * HOLD_1S 0x0202 0x212 bit 5
> > > + * POWERKEY_UP 0x0202 0x212 bit 6
> > > + * POWERKEY_DOWN 0x0202 0x212 bit 7
> > > + *
> > > + * OCP_SCP_R 0x0203 0x213 bit 0
> > > + * COUL_R 0x0203 0x213 bit 1
> > > + * SIM0_HPD_R 0x0203 0x213 bit 2
> > > + * SIM0_HPD_F 0x0203 0x213 bit 3
> > > + * SIM1_HPD_R 0x0203 0x213 bit 4
> > > + * SIM1_HPD_F 0x0203 0x213 bit 5
> > > + * ====================== ============= ============ =====
> > > + *
> > > + * Each mask register contains 8 bits. The ancillary macros below
> > > + * convert a number from 0 to 14 into a register address and a bit mask
> > > + */
> > > +#define HISI_IRQ_MASK_REG(irq_data) (SOC_PMIC_IRQ_MASK_0_ADDR + \
> > > + (irqd_to_hwirq(irq_data) / BITS_PER_BYTE))
> > > +#define HISI_IRQ_MASK_BIT(irq_data) BIT(irqd_to_hwirq(irq_data) & (BITS_PER_BYTE - 1))
> > > +#define HISI_8BITS_MASK GENMASK(BITS_PER_BYTE - 1, 0)
> >
> > Are these lines up in real code? Looks like they're not in the diff.
>
> Weird. The changes to use those are at patch 3/8. All the above
> macros are used at the patch.
Sorry, that made no sense - it's been a long few days!
I meant to say "do these (the tabs) line up?"
> > > +static const struct mfd_cell hi6421v600_devs[] = {
> > > + { .name = "hi6421v600-regulator", },
> > > +};
> >
> > Where are the other devices?
>
> While this is a MFD device, as it has regulators, ADC and other
> stuff, right now, only the regulator and the IRQs are implemented.
>
> The IRQs are at the core of this driver, while the regulator
> is at the separate regulator driver.
The rule usually goes:
Drivers don't qualify as MFDs until you register >1 device.
[...]
> > > + for (i = 0; i < PMIC_IRQ_LIST_MAX; i++) {
> > > + virq = irq_create_mapping(ddata->domain, i);
> > > + if (!virq) {
> > > + dev_err(dev, "Failed to map H/W IRQ\n");
> > > + return -ENOSPC;
> >
> > -ENOSPC doesn't seem right here.
> >
> > Can't find any other uses of it for irq_create_mapping() either.
>
> There are two drivers returning -ENOSPC:
>
> arch/powerpc/platforms/pseries/msi.c
> arch/powerpc/sysdev/mpic_u3msi.c
I only looked in drivers/
> But others return -EIO, -EINVAL, -ENOMEM, -ENODEV, -ENXIO.
>
> I think that -ENODEV would fit better here.
I think -ENXIO is the most common, followed by -EINVAL.
This doesn't have anything to do with devices per say.
> > > +static void hi6421_spmi_pmic_remove(struct spmi_device *pdev)
> > > +{
> > > + struct hi6421_spmi_pmic *ddata = dev_get_drvdata(&pdev->dev);
> > > +
> > > + free_irq(ddata->irq, ddata);
> >
> > No devm_* version?
>
> Are there a devm_* variant for gpio_to_irq()?
Please refer to Dan's response.
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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