Re: [PATCH v2 2/5] mfd: ts4800-syscon: add driver for TS-4800 syscon

From: Lee Jones
Date: Mon Nov 02 2015 - 04:13:11 EST

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[Cc'ing Arnd]

On Fri, 30 Oct 2015, Damien Riegel wrote:
> On Fri, Oct 30, 2015 at 05:56:56PM +0000, Lee Jones wrote:
> > On Thu, 29 Oct 2015, Damien Riegel wrote:
> >
> > > Driver for TS-4800 syscon. These registers belong to a FPGA that is
> > > memory mapped and are used for counters, enable various IPs in the FPGA,
> > > control LEDs, control IOs, etc.
> > >
> > > Currently, only the watchdog is handled.
> >
> > Why do you require your own syscon driver?
> >
> > What's wrong with the generic one?
> >
>
> The generic one uses a regmap_config with reg_stride set to 4 and val_bits
> to 32.
>
> TS-4800 syscon registers are 16-bit wide and must be accessed with 16
> bit read and writes:
> http://wiki.embeddedarm.com/wiki/TS-4800#Syscon
>
> I will address the other issues in the next version (split commit,
> license issue, style, and superfluous remove).

The Syscon driver was written to be generic so that each
vendor/platform didn't require their own incarnation. How unique is
the TS-4800?

Perhaps it might be better to supply a generic 16 bit Syscon for
devices akin to the TS-4800?

Arnd, any opinion on this?

> > > Signed-off-by: Damien Riegel <damien.riegel@xxxxxxxxxxxxxxxxxxxx>
> > > ---
> > > .../devicetree/bindings/mfd/ts4800-syscon.txt | 12 ++++
> >
> > Separate patch please.
> >
> > > drivers/mfd/Kconfig | 7 ++
> > > drivers/mfd/Makefile | 1 +
> > > drivers/mfd/ts4800-syscon.c | 84 ++++++++++++++++++++++
> > > include/linux/mfd/ts4800-syscon.h | 24 +++++++
> > > 5 files changed, 128 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
> > > create mode 100644 drivers/mfd/ts4800-syscon.c
> > > create mode 100644 include/linux/mfd/ts4800-syscon.h
> > >
> > > diff --git a/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
> > > new file mode 100644
> > > index 0000000..8dbc12c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
> > > @@ -0,0 +1,12 @@
> > > +Technologic Systems Syscon
> > > +
> > > +Required properties:
> > > +- compatible : must be "ts,ts4800-syscon"
> > > +- reg : physical base address and length of memory mapped region
> > > +
> > > +Example:
> > > +
> > > +syscon@b0010000 {
> > > + compatible = "ts,ts4800-syscon";
> > > + reg = <0xb0010000 0x3d>;
> > > +};
> > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > > index 3f68dd2..8f03dce 100644
> > > --- a/drivers/mfd/Kconfig
> > > +++ b/drivers/mfd/Kconfig
> > > @@ -1302,6 +1302,13 @@ config MFD_TC6393XB
> > > help
> > > Support for Toshiba Mobile IO Controller TC6393XB
> > >
> > > +config MFD_TS4800_SYSCON
> > > + tristate "TS-4800 Syscon Support"
> > > + select REGMAP
> > > + select REGMAP_MMIO
> > > + help
> > > + Support for TS-4800's FPGA Syscon registers
> > > +
> > > config MFD_VX855
> > > tristate "VIA VX855/VX875 integrated south bridge"
> > > depends on PCI
> > > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > > index ea40e07..e2c0f1b 100644
> > > --- a/drivers/mfd/Makefile
> > > +++ b/drivers/mfd/Makefile
> > > @@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
> > > obj-$(CONFIG_MFD_DLN2) += dln2.o
> > > obj-$(CONFIG_MFD_RT5033) += rt5033.o
> > > obj-$(CONFIG_MFD_SKY81452) += sky81452.o
> > > +obj-$(CONFIG_MFD_TS4800_SYSCON) += ts4800-syscon.o
> > >
> > > intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
> > > obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
> > > diff --git a/drivers/mfd/ts4800-syscon.c b/drivers/mfd/ts4800-syscon.c
> > > new file mode 100644
> > > index 0000000..1e42e96
> > > --- /dev/null
> > > +++ b/drivers/mfd/ts4800-syscon.c
> > > @@ -0,0 +1,84 @@
> > > +/*
> > > + * Device driver for TS-4800 FPGA's syscon
> > > + *
> > > + * Copyright (c) 2015 - Savoir-faire Linux
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License as published by
> > > + * the Free Software Foundation; either version 2 of the License, or
> > > + * (at your option) any later version.
> >
> > Why is the MFD v2+ and the Watchdog driver only v2?
> >
> > > + * This program is distributed in the hope it will be useful, but WITHOUT
> > > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> > > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> > > + * more details.
> > > + */
> > > +
> > > +#include <linux/device.h>
> > > +#include <linux/err.h>
> > > +#include <linux/mfd/core.h>
> > > +#include <linux/module.h>
> > > +#include <linux/of.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/mfd/ts4800-syscon.h>
> >
> > Alphabetical.
> >
> > > +
> > > +
> >
> > Superfluous '\n'.
> >
> > > +static const struct regmap_config ts4800_regmap_config = {
> > > + .reg_bits = 32,
> > > + .reg_stride = 2,
> > > + .val_bits = 16,
> > > +};
> > > +
> > > +static int ts4800_syscon_probe(struct platform_device *pdev)
> > > +{
> > > + struct ts4800_syscon *syscon;
> > > + struct resource *res;
> > > + void __iomem *base;
> > > +
> > > + syscon = devm_kzalloc(&pdev->dev, sizeof(*syscon), GFP_KERNEL);
> > > + if (!syscon)
> > > + return -ENOMEM;
> > > +
> > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + base = devm_ioremap_resource(&pdev->dev, res);
> > > + if (IS_ERR(base))
> > > + return PTR_ERR(base);
> > > +
> > > + syscon->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
> > > + &ts4800_regmap_config);
> > > + if (IS_ERR(syscon->regmap)) {
> > > + dev_err(&pdev->dev,
> > > + "regmap init failed: %ld\n",
> > > + PTR_ERR(syscon->regmap));
> > > + return PTR_ERR(syscon->regmap);
> > > + }
> > > +
> > > + platform_set_drvdata(pdev, syscon);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int ts4800_syscon_remove(struct platform_device *pdev)
> > > +{
> > > + return 0;
> > > +}
> >
> > If it doesn't do anything, don't provide it.
> >
> > > +static const struct of_device_id ts4800_syscon_of_match[] = {
> > > + { .compatible = "ts,ts4800-syscon", },
> > > + { },
> > > +};
> > > +
> > > +static struct platform_driver ts4800_syscon_driver = {
> > > + .driver = {
> > > + .name = "ts4800_syscon",
> > > + .of_match_table = ts4800_syscon_of_match,
> > > + },
> > > + .probe = ts4800_syscon_probe,
> > > + .remove = ts4800_syscon_remove,
> > > +};
> > > +module_platform_driver(ts4800_syscon_driver);
> > > +
> > > +MODULE_AUTHOR("Damien Riegel <damien.riegel@xxxxxxxxxxxxxxxxxxxx>");
> > > +MODULE_DESCRIPTION("TS-4800 Syscon driver");
> > > +MODULE_LICENSE("GPL v2");
> >
> > This does not match the header.
> >
> > > diff --git a/include/linux/mfd/ts4800-syscon.h b/include/linux/mfd/ts4800-syscon.h
> > > new file mode 100644
> > > index 0000000..3d29184
> > > --- /dev/null
> > > +++ b/include/linux/mfd/ts4800-syscon.h
> > > @@ -0,0 +1,24 @@
> > > +/*
> > > + * Copyright (c) 2015 - Savoir-faire Linux
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License as published by
> > > + * the Free Software Foundation; either version 2 of the License, or
> > > + * (at your option) any later version.
> > > + *
> > > + * This program is distributed in the hope it will be useful, but WITHOUT
> > > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> > > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> > > + * more details.
> > > + */
> > > +
> > > +#ifndef __LINUX_MFD_TS4800_SYSCON_H
> > > +#define __LINUX_MFD_TS4800_SYSCON_H
> > > +
> > > +#include <linux/regmap.h>
> > > +
> > > +struct ts4800_syscon {
> > > + struct regmap *regmap;
> > > +};
> > > +
> > > +#endif /* __LINUX_MFD_TS4800_SYSCON_H */
> >

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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Next message: Lee Jones: "Re: [PATCH v2 1/5] of: add vendor prefix for Technologic Systems"
Previous message: Vincent ABRIOU: "Re: [PATCH] drm/sti: Remove select of CONFIG_FW_LOADER_USER_HELPER_FALLBACK"
Next in thread: Damien Riegel: "Re: [PATCH v2 2/5] mfd: ts4800-syscon: add driver for TS-4800 syscon"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]