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Date: Tue, 15 Nov 2016 18:38:48 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Stephen Warren <swarren@...dotorg.org>,
Alexandre Courbot <gnurou@...il.com>,
Jon Hunter <jonathanh@...dia.com>, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] reset: Add Tegra BPMP reset driver
On Tue, Nov 15, 2016 at 06:11:16PM +0100, Philipp Zabel wrote:
> Hi Thierry,
>
> Am Dienstag, den 15.11.2016, 17:17 +0100 schrieb Thierry Reding:
> > From: Thierry Reding <treding@...dia.com>
> >
> > This driver uses the services provided by the BPMP firmware driver to
> > implement a reset driver based on the MRQ_RESET request.
> >
> > Signed-off-by: Thierry Reding <treding@...dia.com>
> > ---
> > Hi Philipp,
> >
> > I'm looking for an Acked-by on this because there are complicated
> > dependencies between this and other branches in the Tegra tree, so I
> > think it would be easiest to merge through that.
> >
> > Thanks,
> > Thierry
> >
> > drivers/reset/Kconfig | 1 +
> > drivers/reset/Makefile | 1 +
> > drivers/reset/tegra/Kconfig | 3 ++
> > drivers/reset/tegra/Makefile | 1 +
> > drivers/reset/tegra/reset-bpmp.c | 71 ++++++++++++++++++++++++++++++++++++++++
> > 5 files changed, 77 insertions(+)
> > create mode 100644 drivers/reset/tegra/Kconfig
> > create mode 100644 drivers/reset/tegra/Makefile
> > create mode 100644 drivers/reset/tegra/reset-bpmp.c
> >
> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> > index 06d9fa2f3bc0..172dc966a01f 100644
> > --- a/drivers/reset/Kconfig
> > +++ b/drivers/reset/Kconfig
> > @@ -94,5 +94,6 @@ config RESET_ZYNQ
> >
> > source "drivers/reset/sti/Kconfig"
> > source "drivers/reset/hisilicon/Kconfig"
> > +source "drivers/reset/tegra/Kconfig"
> >
> > endif
> > diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> > index bbe7026617fc..13b346e03d84 100644
> > --- a/drivers/reset/Makefile
> > +++ b/drivers/reset/Makefile
> > @@ -1,6 +1,7 @@
> > obj-y += core.o
> > obj-y += hisilicon/
> > obj-$(CONFIG_ARCH_STI) += sti/
> > +obj-$(CONFIG_ARCH_TEGRA) += tegra/
>
> Could drivers therein be compiled without ARCH_TEGRA enabled? If so,
> please use obj-y here.
>
> > obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
> > obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
> > obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
> > diff --git a/drivers/reset/tegra/Kconfig b/drivers/reset/tegra/Kconfig
> > new file mode 100644
> > index 000000000000..0ec57a7016e6
> > --- /dev/null
> > +++ b/drivers/reset/tegra/Kconfig
> > @@ -0,0 +1,3 @@
> > +config RESET_TEGRA_BPMP
> > + def_bool y
> > + depends on TEGRA_BPMP
>
> Or probably not, it looks like TEGRA_BPMP depends on ARCH_TEGRA and
> doesn't provide any stubs. I think this could be just
> def_bool TEGRA_BPMP
> though. But see below, RESET_TEGRA_BPMP doesn't seem to be used at all.
Yes, this is all really Tegra-specific, so I don't think it makes sense
to allow building this without.
> > diff --git a/drivers/reset/tegra/Makefile b/drivers/reset/tegra/Makefile
> > new file mode 100644
> > index 000000000000..fd943b1ae029
> > --- /dev/null
> > +++ b/drivers/reset/tegra/Makefile
> > @@ -0,0 +1 @@
> > +obj-$(CONFIG_ARCH_TEGRA_186_SOC) += reset-bpmp.o
>
> This should probably be obj-$(CONFIG_RESET_TEGRA_BPMP).
Yes indeed. I had introduced RESET_TEGRA_BPMP is a way of resolving the
dependencies more nicely. The code structure is such that the BPMP
driver needs to call clock and reset drivers, and there are
CLOCK_TEGRA_BPMP and RESET_TEGRA_BPMP symbols to protect those bits of
the code and avoid a circular dependency.
> > diff --git a/drivers/reset/tegra/reset-bpmp.c b/drivers/reset/tegra/reset-bpmp.c
> > new file mode 100644
> > index 000000000000..5daf2ee1a396
> > --- /dev/null
> > +++ b/drivers/reset/tegra/reset-bpmp.c
> > @@ -0,0 +1,71 @@
> > +/*
> > + * Copyright (C) 2016 NVIDIA Corporation
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include <linux/reset-controller.h>
> > +
> > +#include <soc/tegra/bpmp.h>
> > +#include <soc/tegra/bpmp-abi.h>
> > +
> > +static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
> > +{
> > + return container_of(rstc, struct tegra_bpmp, rstc);
> > +}
> > +
> > +static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
> > + enum mrq_reset_commands command,
> > + unsigned int id)
> > +{
> > + struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
> > + struct mrq_reset_request request;
> > + struct tegra_bpmp_message msg;
> > +
> > + memset(&request, 0, sizeof(request));
> > + request.cmd = command;
> > + request.reset_id = id;
> > +
> > + memset(&msg, 0, sizeof(msg));
> > + msg.mrq = MRQ_RESET;
> > + msg.tx.data = &request;
> > + msg.tx.size = sizeof(request);
> > +
> > + return tegra_bpmp_transfer(bpmp, &msg);
> > +}
> > +
> > +static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
> > + unsigned long id)
> > +{
> > + return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
> > +}
> > +
> > +static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
> > + unsigned long id)
> > +{
> > + return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
> > +}
> > +
> > +static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
> > + unsigned long id)
> > +{
> > + return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
> > +}
> > +
> > +static const struct reset_control_ops tegra_bpmp_reset_ops = {
> > + .reset = tegra_bpmp_reset_module,
> > + .assert = tegra_bpmp_reset_assert,
> > + .deassert = tegra_bpmp_reset_deassert,
> > +};
> > +
> > +int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
> > +{
> > + bpmp->rstc.ops = &tegra_bpmp_reset_ops;
> > + bpmp->rstc.owner = THIS_MODULE;
> > + bpmp->rstc.of_node = bpmp->dev->of_node;
> > + bpmp->rstc.nr_resets = bpmp->soc->num_resets;
> > +
> > + return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
> > +}
>
> With the Kconfig symbol confusion resolved,
>
> Acked-by: Philipp Zabel <p.zabel@...gutronix.de>
>
> to merge this via the Tegra trees.
Great, I'll make that change and merge through the Tegra tree.
Thanks!
Thierry
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