From: Liu Ying <victor.liu@nxp.com>
To: Lee Jones <lee@kernel.org>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, shawnguo@kernel.org,
s.hauer@pengutronix.de, kernel@pengutronix.de,
festevam@gmail.com, linux-imx@nxp.com
Subject: Re: [PATCH RESEND] mfd: Add Freescale i.MX8qxp Control and Status Registers (CSR) module driver
Date: Tue, 01 Nov 2022 13:53:49 +0800 [thread overview]
Message-ID: <afa29fcc11436dd957314a4066c9141937f0470c.camel@nxp.com> (raw)
In-Reply-To: <Y1/sUfeVy1a6EKZQ@google.com>
Hi Lee,
On Mon, 2022-10-31 at 15:40 +0000, Lee Jones wrote:
> 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@nxp.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/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.
simple-mfd devices have "ONLY_BUS" set in simple-pm-bus.c, so the
simple-pm-bus driver would not populate child devices of simple-mfd
devices. Also, the simple-pm-bus driver would not enable runtime power
management for simple-mfd devices due to "ONLY_BUS", which means it
would not propagate power management operations from child devices of
simple-mfd devices to parent devices of simple-mfd devices. That's why
a dedicated fsl-imx8qxp-csr driver is needed.
Regards,
Liu Ying
[...]
next prev parent reply other threads:[~2022-11-01 5:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-17 7:57 [PATCH RESEND] mfd: Add Freescale i.MX8qxp Control and Status Registers (CSR) module driver Liu Ying
2022-10-31 8:44 ` Liu Ying
2022-10-31 9:30 ` Lee Jones
2022-10-31 15:40 ` Lee Jones
2022-11-01 5:53 ` Liu Ying [this message]
2022-11-02 3:49 ` Liu Ying
2022-11-07 9:05 ` Lee Jones
2022-11-08 3:56 ` Liu Ying
2022-11-09 12:50 ` Ying Liu
2022-11-14 10:03 ` Lee Jones
2022-11-14 10:01 ` Lee Jones
2022-11-14 20:54 ` Rob Herring
2022-11-15 5:21 ` Liu Ying
2022-11-15 13:33 ` Rob Herring
2022-11-16 3:12 ` Liu Ying
2022-11-16 13:57 ` Lee Jones
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