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Message-ID: <1445938084.22398.4.camel@mtksdaap41>
Date: Tue, 27 Oct 2015 17:28:04 +0800
From: andrew-ct chen <andrew-ct.chen@...iatek.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
CC: Maxime Ripard <maxime.ripard@...e-electrons.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
"Kumar Gala" <galak@...eaurora.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH 2/3] nvmem: mediatek: Add Mediatek EFUSE driver
On Tue, 2015-10-27 at 13:32 +0800, andrew-ct chen wrote:
> On Mon, 2015-10-26 at 09:56 +0000, Srinivas Kandagatla wrote:
> > On 16/10/15 09:39, andrew-ct.chen@...iatek.com wrote:
> > > From: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> > >
> > > Add Mediatek EFUSE driver to access hardware data like
> > > thermal sensor calibration or HDMI impedance.
> > >
> > > Signed-off-by: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> >
> > Dirver looks pretty simple, below are few minor nits.
> >
> > Please rebase this patch on top of v4.4-rc1 once its released in few
> > weeks, so that I can queue this driver for v4.5.
>
> We will rebase it.
>
> >
> > > ---
> > > drivers/nvmem/Kconfig | 11 ++++++
> > > drivers/nvmem/Makefile | 1 +
> > > drivers/nvmem/mtk-efuse.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
> > > 3 files changed, 101 insertions(+)
> > > create mode 100644 drivers/nvmem/mtk-efuse.c
> > >
> > > diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> > > index 8db2978..1bd5badc 100644
> > > --- a/drivers/nvmem/Kconfig
> > > +++ b/drivers/nvmem/Kconfig
> > > @@ -14,6 +14,17 @@ menuconfig NVMEM
> > >
> > > if NVMEM
> > >
> > > +config MTK_EFUSE
> > > + tristate "Mediatek SoCs EFUSE support"
> > > + depends on ARCH_MEDIATEK || COMPILE_TEST
> > > + select REGMAP_MMIO
> > > + help
> > > + This is a driver to access hardware related data like sensor
> > > + calibration, HDMI impedance etc.
> > > +
> > > + This driver can also be built as a module. If so, the module
> > > + will be called efuse-mtk.
> > > +
> > > config QCOM_QFPROM
> > > tristate "QCOM QFPROM Support"
> > > depends on ARCH_QCOM || COMPILE_TEST
> > > diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
> > > index 4328b93..916b727 100644
> > > --- a/drivers/nvmem/Makefile
> > > +++ b/drivers/nvmem/Makefile
> > > @@ -6,6 +6,7 @@ obj-$(CONFIG_NVMEM) += nvmem_core.o
> > > nvmem_core-y := core.o
> > >
> > > # Devices
> > > +obj-$(CONFIG_MTK_EFUSE) += mtk-efuse.o
> >
> > For consistency reasons, could you do this similar to other drivers.
We will do this for the consistency.
> >
> > > obj-$(CONFIG_QCOM_QFPROM) += nvmem_qfprom.o
> > > nvmem_qfprom-y := qfprom.o
> > > obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o
> > > diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
> > > new file mode 100644
> > > index 0000000..9021c0b
> > > --- /dev/null
> > > +++ b/drivers/nvmem/mtk-efuse.c
> > > @@ -0,0 +1,89 @@
> > > +/*
> > > + * Copyright (c) 2015 MediaTek Inc.
> > > + * Author: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> > > + *
> > > + * 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.
> > > + *
> > > + * 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.
> > > + */
> > > +
> > > +#include <linux/device.h>
> > > +#include <linux/module.h>
> > > +#include <linux/nvmem-provider.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > > +
> > > +static struct regmap_config mtk_regmap_config = {
> > > + .reg_bits = 32,
> > > + .val_bits = 32,
> > > + .reg_stride = 4,
> > > +};
> > > +
> > > +static int mtk_efuse_probe(struct platform_device *pdev)
> > > +{
> > > + struct device *dev = &pdev->dev;
> > > + struct resource *res;
> > > + struct nvmem_device *nvmem;
> > > + struct nvmem_config *econfig;
> > > + struct regmap *regmap;
> > > + void __iomem *base;
> > > +
> > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + base = devm_ioremap_resource(dev, res);
> > > + if (IS_ERR(base))
> > > + return PTR_ERR(base);
> > > +
> > > + econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
> > > + if (!econfig)
> > > + return -ENOMEM;
> > Why not use static econfig variable?
> >
> > > +
> > > + mtk_regmap_config.max_register = resource_size(res) - 1;
> > > +
> > > + regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
> > > + if (IS_ERR(regmap)) {
> > > + dev_err(dev, "regmap init failed\n");
> > > + return PTR_ERR(regmap);
> > > + }
> > > +
> > > + econfig->dev = dev;
> > > + econfig->owner = THIS_MODULE;
> > > + nvmem = nvmem_register(econfig);
> > > + if (IS_ERR(nvmem))
> > > + return PTR_ERR(nvmem);
> > > +
> > > + platform_set_drvdata(pdev, nvmem);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int mtk_efuse_remove(struct platform_device *pdev)
> > > +{
> > > + struct nvmem_device *nvmem = platform_get_drvdata(pdev);
> > > +
> > > + return nvmem_unregister(nvmem);
> > > +}
> > > +
> > > +static const struct of_device_id mtk_efuse_of_match[] = {
> > > + { .compatible = "mediatek,mt8135-efuse",},
> > > + { .compatible = "mediatek,mt8173-efuse",},
> > > + {/* sentinel */},
> > > +};
> > > +MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
> > > +
> > > +static struct platform_driver mtk_efuse_driver = {
> > > + .probe = mtk_efuse_probe,
> > > + .remove = mtk_efuse_remove,
> > > + .driver = {
> > > + .name = "mediatek,efuse",
> > > + .of_match_table = mtk_efuse_of_match,
> > > + },
> > > +};
> > > +module_platform_driver(mtk_efuse_driver);
> > > +MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@...iatek.com>");
> > > +MODULE_DESCRIPTION("Mediatek EFUSE driver");
> > > +MODULE_LICENSE("GPL v2");
> > >
>
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