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Message-ID: <20120211060510.GB2198@r65073-Latitude-D630>
Date: Fri, 10 Feb 2012 22:05:11 -0800
From: Shawn Guo <shawn.guo@...aro.org>
To: "Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linaro-dev@...ts.linaro.org, patches@...aro.org,
eric.miao@...aro.org, Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v4 1/2] mfd: Add anatop mfd driver
On Thu, Feb 09, 2012 at 04:51:25AM +0800, Ying-Chun Liu (PaulLiu) wrote:
> From: "Ying-Chun Liu (PaulLiu)" <paul.liu@...aro.org>
>
> Anatop is a mfd chip embedded in Freescale i.MX6Q SoC.
> Anatop provides regulators and thermal.
> This driver handles the address space and the operation of the mfd device.
>
> Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@...aro.org>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> ---
> drivers/mfd/Kconfig | 6 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/anatop-mfd.c | 152 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/anatop.h | 39 +++++++++++
> 4 files changed, 198 insertions(+), 0 deletions(-)
> create mode 100644 drivers/mfd/anatop-mfd.c
> create mode 100644 include/linux/mfd/anatop.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index cd13e9f..4f71627 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -830,6 +830,12 @@ config MFD_INTEL_MSIC
> Passage) chip. This chip embeds audio, battery, GPIO, etc.
> devices used in Intel Medfield platforms.
>
> +config MFD_ANATOP
> + bool "Support for Anatop"
> + depends on SOC_IMX6Q
> + help
> + Select this option to enable Anatop MFD driver.
> +
> endmenu
> endif
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index b953bab..8e11060 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -112,3 +112,4 @@ obj-$(CONFIG_TPS65911_COMPARATOR) += tps65911-comparator.o
> obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
> obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
> obj-$(CONFIG_MFD_S5M_CORE) += s5m-core.o s5m-irq.o
> +obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o
> diff --git a/drivers/mfd/anatop-mfd.c b/drivers/mfd/anatop-mfd.c
> new file mode 100644
> index 0000000..58c6054
> --- /dev/null
> +++ b/drivers/mfd/anatop-mfd.c
> @@ -0,0 +1,152 @@
> +/*
> + * Anatop MFD driver
> + *
> + * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@...aro.org>
> + * Copyright (C) 2012 Linaro
> + *
> + * 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 that 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.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + * 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 that 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.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + */
> +
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +#include <linux/mfd/anatop.h>
> +
> +static u32 anatop_read(struct anatop *adata, u32 addr, int bit_shift, int bits)
> +{
> + u32 val;
> + int mask;
Nit: it may be nice to put a blank line here.
> + if (bits == 32)
> + mask = 0xff;
Shouldn't it be ~0?
> + else
> + mask = (1 << bits) - 1;
> +
> + val = ioread32(adata->ioreg+addr);
Why not just readl()? Nit: put space before and after '+'.
> + val = (val >> bit_shift) & mask;
Nit: it may be nice to put a blank line here.
> + return val;
> +}
> +
> +static void anatop_write(struct anatop *adata, u32 addr, int bit_shift,
> + int bits, u32 data)
> +{
> + u32 val;
> + int mask;
> + if (bits == 32)
> + mask = 0xff;
> + else
> + mask = (1 << bits) - 1;
> +
> + val = ioread32(adata->ioreg+addr) & ~(mask << bit_shift);
> + iowrite32((data << bit_shift) | val, adata->ioreg);
Same comments on anatop_read apply on anatop_write here.
> +}
> +
> +static const struct of_device_id of_anatop_regulator_match[] = {
A better naming of of_anatop_regulator_match, since it covers not only
regulator but also thermal as below?
> + {
> + .compatible = "fsl,anatop-regulator",
> + },
Nit: since you only have one line here, it could be just:
{ .compatible = "fsl,anatop-regulator", },
> + {
> + .compatible = "fsl,anatop-thermal",
> + },
> + { },
> +};
> +
> +static int of_anatop_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + u64 ofaddr;
> + u64 ofsize;
> + void *ioreg;
> + struct anatop *drvdata;
> + int ret = 0;
> + const __be32 *rval;
> +
---
> + rval = of_get_address(np, 0, &ofsize, NULL);
> + if (rval)
> + ofaddr = be32_to_cpu(*rval);
> + else
> + return -EINVAL;
> +
> + ioreg = ioremap(ofaddr, ofsize);
---
Above lines can just be of_iomap(np, 0);
> + if (!ioreg)
> + return -EINVAL;
> + drvdata = devm_kzalloc(dev, sizeof(struct anatop), GFP_KERNEL);
> + if (!drvdata)
> + return -EINVAL;
> + drvdata->ioreg = ioreg;
> + drvdata->read = anatop_read;
> + drvdata->write = anatop_write;
> + platform_set_drvdata(pdev, drvdata);
> + of_platform_bus_probe(np, of_anatop_regulator_match, dev);
Nit: it may be nice to put a blank line here.
> + return ret;
The 'ret' is used nowhere, so the above line can just be:
return 0;
> +}
> +
> +static int of_anatop_remove(struct platform_device *pdev)
> +{
Nothing to do here? At least iounmap?
> + return 0;
> +}
> +
> +static const struct of_device_id of_anatop_match[] = {
> + {
> + .compatible = "fsl,imx6q-anatop",
> + },
{ .compatible = "fsl,imx6q-anatop", },
> + { },
> +};
> +
> +static struct platform_driver anatop_of_driver = {
> + .driver = {
> + .name = "anatop-mfd",
> + .owner = THIS_MODULE,
> + .of_match_table = of_anatop_match,
> + },
> + .probe = of_anatop_probe,
> + .remove = of_anatop_remove,
> +};
> +
> +static int __init anatop_init(void)
> +{
> + int ret;
> + ret = platform_driver_register(&anatop_of_driver);
> + return ret;
return platform_driver_register(&anatop_of_driver);
> +}
> +
> +static void __exit anatop_exit(void)
> +{
> + platform_driver_unregister(&anatop_of_driver);
> +}
> +
> +postcore_initcall(anatop_init);
> +module_exit(anatop_exit);
> +
> +MODULE_AUTHOR("Ying-Chun Liu (PaulLiu)");
Missing your email address here.
> +MODULE_DESCRIPTION("ANATOP MFD driver");
> +MODULE_LICENSE("GPL");
"GPL v2" for better?
> diff --git a/include/linux/mfd/anatop.h b/include/linux/mfd/anatop.h
> new file mode 100644
> index 0000000..4425538
> --- /dev/null
> +++ b/include/linux/mfd/anatop.h
> @@ -0,0 +1,39 @@
> +/*
> + * anatop.h - Anatop MFD driver
> + *
> + * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paulliu@...ian.org>
It would nice to use a consistent email address through the patch.
Regards,
Shawn
> + * Copyright (C) 2012 Linaro
> + *
> + * 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 that 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + */
> +
> +#ifndef __LINUX_MFD_ANATOP_H
> +#define __LINUX_MFD_ANATOP_H
> +
> +/**
> + * anatop - MFD data
> + * @ioreg: ioremap register
> + * @read: function to read bits from the device
> + * @write: function to write bits to the device
> + */
> +struct anatop {
> + void *ioreg;
> + u32 (*read) (struct anatop *adata, u32 addr, int bit_shift, int bits);
> + void (*write) (struct anatop *adata, u32 addr, int bit_shift,
> + int bits, u32 data);
> +
> +};
> +
> +#endif /* __LINUX_MFD_ANATOP_H */
> --
> 1.7.8.3
>
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