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Message-ID: <42216215-4db1-4015-878f-25a7770d44c2@tuxon.dev>
Date: Wed, 17 Jul 2024 10:37:40 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>, "lee@...nel.org" <lee@...nel.org>,
"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
"alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
"geert+renesas@...der.be" <geert+renesas@...der.be>,
"magnus.damm@...il.com" <magnus.damm@...il.com>,
"mturquette@...libre.com" <mturquette@...libre.com>,
"sboyd@...nel.org" <sboyd@...nel.org>,
"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v2 02/11] mfd: renesas-vbattb: Add a MFD driver for the
Renesas VBATTB IP
Hi, Biju,
On 16.07.2024 14:00, Biju Das wrote:
> Hi Claudiu,
>
> Thanks for the patch.
>
>
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: Tuesday, July 16, 2024 11:30 AM
>> Subject: [PATCH v2 02/11] mfd: renesas-vbattb: Add a MFD driver for the Renesas VBATTB IP
>>
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Renesas VBATTB IP has logic to control the RTC clock, tamper detection and a small 128B memory. Add a
>> MFD driver to do the basic initialization of the VBATTB IP for the inner components to work.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>
>> Changes in v2:
>> - none; this driver is new
>>
>> drivers/mfd/Kconfig | 8 ++++
>> drivers/mfd/Makefile | 1 +
>> drivers/mfd/renesas-vbattb.c | 78 ++++++++++++++++++++++++++++++++++++
>> 3 files changed, 87 insertions(+)
>> create mode 100644 drivers/mfd/renesas-vbattb.c
>>
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index bc8be2e593b6..df93e8b05065 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -1383,6 +1383,14 @@ config MFD_SC27XX_PMIC
>> This driver provides common support for accessing the SC27xx PMICs,
>> and it also adds the irq_chip parts for handling the PMIC chip events.
>>
>> +config MFD_RENESAS_VBATTB
>> + tristate "Renesas VBATTB driver"
>> + depends on (ARCH_RZG2L && OF) || COMPILE_TEST
>> + select MFD_CORE
>
> There is no MFD calls?? What is the purpose of selecting MFD_CORE??
I missed to remove it from here.
>
>> + help
>> + Select this option to enable Renesas RZ/G3S VBATTB driver which
>> + provides support for the RTC clock, tamper detector and 128B SRAM.
>> +
>> config RZ_MTU3
>> tristate "Renesas RZ/G2L MTU3a core driver"
>> depends on (ARCH_RZG2L && OF) || COMPILE_TEST diff --git a/drivers/mfd/Makefile
>> b/drivers/mfd/Makefile index 02b651cd7535..cd2f27492df2 100644
>> --- a/drivers/mfd/Makefile
>> +++ b/drivers/mfd/Makefile
>> @@ -186,6 +186,7 @@ pcf50633-objs := pcf50633-core.o pcf50633-irq.o
>> obj-$(CONFIG_MFD_PCF50633) += pcf50633.o
>> obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
>> obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
>> +obj-$(CONFIG_MFD_RENESAS_VBATTB) += renesas-vbattb.o
>> obj-$(CONFIG_RZ_MTU3) += rz-mtu3.o
>> obj-$(CONFIG_ABX500_CORE) += abx500-core.o
>> obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o
>> diff --git a/drivers/mfd/renesas-vbattb.c b/drivers/mfd/renesas-vbattb.c new file mode 100644 index
>> 000000000000..5d71565b8cbf
>> --- /dev/null
>> +++ b/drivers/mfd/renesas-vbattb.c
>> @@ -0,0 +1,78 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * VBATTB driver
>> + *
>> + * Copyright (C) 2024 Renesas Electronics Corp.
>> + */
>> +
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/reset.h>
>> +
>> +static int vbattb_probe(struct platform_device *pdev) {
>> + struct device *dev = &pdev->dev;
>> + struct reset_control *rstc;
>> + int ret;
>> +
>> + rstc = devm_reset_control_array_get_exclusive(dev);
>> + if (IS_ERR(rstc))
>> + return PTR_ERR(rstc);
>> +
>> + ret = devm_pm_runtime_enable(dev);
>> + if (ret)
>> + return ret;
>> +
>> + ret = pm_runtime_resume_and_get(dev);
>> + if (ret)
>> + return ret;
>> +
>> + ret = reset_control_deassert(rstc);
>> + if (ret)
>> + goto rpm_put;
>> +
>> + platform_set_drvdata(pdev, rstc);
>> +
>> + ret = devm_of_platform_populate(dev);
>> + if (ret)
>> + goto reset_assert;
>> +
>> + return 0;
>> +
>> +reset_assert:
>> + reset_control_assert(rstc);
>> +rpm_put:
>> + pm_runtime_put(dev);
>> + return ret;
>> +}
>> +
>> +static void vbattb_remove(struct platform_device *pdev) {
>> + struct reset_control *rstc = platform_get_drvdata(pdev);
>> +
>> + reset_control_assert(rstc);
>> + pm_runtime_put(&pdev->dev);
>> +}
>> +
>> +static const struct of_device_id vbattb_match[] = {
>> + { .compatible = "renesas,r9a08g045-vbattb" },
>> + { /* sentinel */ },
>
> Drop comma.
>
>> +};
>> +MODULE_DEVICE_TABLE(of, vbattb_match);
>> +
>> +static struct platform_driver vbattb_driver = {
>> + .probe = vbattb_probe,
>> + .remove_new = vbattb_remove,
>
> Maybe remove canbe replaced with devm_add_action_or_reset()
> That simplifies probe() aswell??
This approach needs a new structure to keep references to the rstc and dev,
to be able to handle reset and runtime PM in action function. I wanted to
avoid adding a new structure.
Thank you for your review,
Claudiu Beznea
>
>> + .driver = {
>> + .name = "renesas-vbattb",
>> + .of_match_table = vbattb_match,
>> + },
>> +};
>> +module_platform_driver(vbattb_driver);
>> +
>> +MODULE_ALIAS("platform:renesas-vbattb");
>> +MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@...renesas.com>");
>> +MODULE_DESCRIPTION("Renesas VBATTB driver"); MODULE_LICENSE("GPL");
>> --
>> 2.39.2
>>
>
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