Re: [PATCH v7 4/8] mfd: fsl imx25 Touchscreen ADC driver

[Markus Pargmann <mpa@pengutronix.de>]

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Hi,

Sorry for the late reply,

On Mon, Mar 09, 2015 at 09:27:10AM +0000, Lee Jones wrote:
> On Tue, 03 Mar 2015, Markus Pargmann wrote:
> 
> > This is the core driver for imx25 touchscreen/adc driver. The module
> > has one shared ADC and two different conversion queues which use the
> > ADC. The two queues are identical. Both can be used for general purpose
> > ADC but one is meant to be used for touchscreens.
> > 
> > This driver is the core which manages the central components and
> > registers of the TSC/ADC unit. It manages the IRQs and forwards them to
> > the correct components.
> > 
> > Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
> > Signed-off-by: Denis Carikli <denis@eukrea.com>
> > Acked-by: Jonathan Cameron <jic23@kernel.org>
> > ---
> > 
> > Notes:
> >     Changes in v7:
> >      - Cleanup bit defines in header files to be more readable
> >      - Fix irq check to return with an error for irq <= 0
> >      - Add COMPILE_TEST in Kconfig file
> >     
> >     Changes in v5:
> >      - Remove ifdef CONFIG_OF as this driver is only for DT usage
> >      - Remove module owner
> >      - Add Kconfig dependencies ARCH_MX25 and OF
> >     
> >     @Jonathan Cameron:
> >     I left your acked-by on the patch as these were small changes. If it should be
> >     removed, please say so. Thanks
> > 
> >  drivers/mfd/Kconfig             |  10 +++
> >  drivers/mfd/Makefile            |   2 +
> >  drivers/mfd/fsl-imx25-tsadc.c   | 164 ++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/imx25-tsadc.h | 141 ++++++++++++++++++++++++++++++++++
> >  4 files changed, 317 insertions(+)
> >  create mode 100644 drivers/mfd/fsl-imx25-tsadc.c
> >  create mode 100644 include/linux/mfd/imx25-tsadc.h
> > 
> > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> > index 38356e39adba..c0036aef61d7 100644
> > --- a/drivers/mfd/Kconfig
> > +++ b/drivers/mfd/Kconfig
> > @@ -244,6 +244,16 @@ config MFD_MC13XXX_I2C
> >  	help
> >  	  Select this if your MC13xxx is connected via an I2C bus.
> >  
> > +config MFD_MX25_TSADC
> > +	tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
> > +	select REGMAP_MMIO
> > +	depends on SOC_IMX25 || COMPILE_TEST
> > +	depends on OF
> 
> Are you sure you can't compile test with OF disabled?
> 
> 	depends on (SOC_IMX25 && OF) || COMPILE_TEST

Yes, should be possible without OF.

> 
> > +	help
> > +	  Enable support for the integrated Touchscreen and ADC unit of the
> > +	  i.MX25 processors. They consist of a conversion queue for general
> > +	  purpose ADC and a queue for Touchscreens.
> > +
> >  config MFD_HI6421_PMIC
> >  	tristate "HiSilicon Hi6421 PMU/Codec IC"
> >  	depends on OF
> > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> > index 19f3d744e3bd..acfe639e147c 100644
> > --- a/drivers/mfd/Makefile
> > +++ b/drivers/mfd/Makefile
> > @@ -78,6 +78,8 @@ obj-$(CONFIG_TWL4030_POWER)    += twl4030-power.o
> >  obj-$(CONFIG_MFD_TWL4030_AUDIO)	+= twl4030-audio.o
> >  obj-$(CONFIG_TWL6040_CORE)	+= twl6040.o
> >  
> > +obj-$(CONFIG_MFD_MX25_TSADC)	+= fsl-imx25-tsadc.o
> > +
> >  obj-$(CONFIG_MFD_MC13XXX)	+= mc13xxx-core.o
> >  obj-$(CONFIG_MFD_MC13XXX_SPI)	+= mc13xxx-spi.o
> >  obj-$(CONFIG_MFD_MC13XXX_I2C)	+= mc13xxx-i2c.o
> > diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
> > new file mode 100644
> > index 000000000000..c4a3e15001ea
> > --- /dev/null
> > +++ b/drivers/mfd/fsl-imx25-tsadc.c
> > @@ -0,0 +1,164 @@
> > +/*
> > + * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
> > + *
> > + * 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/clk.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irqchip/chained_irq.h>
> > +#include <linux/irqdesc.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/irq.h>
> > +#include <linux/mfd/imx25-tsadc.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +
> > +static struct regmap_config mx25_tsadc_regmap_config = {
> > +	.fast_io = true,
> > +	.max_register = 8,
> > +	.reg_bits = 32,
> > +	.val_bits = 32,
> > +	.reg_stride = 4,
> > +};
> > +
> > +static void mx25_tsadc_irq_handler(u32 irq, struct irq_desc *desc)
> > +{
> > +	struct mx25_tsadc *tsadc = irq_desc_get_handler_data(desc);
> > +	struct irq_chip *chip = irq_get_chip(irq);
> > +	u32 status;
> > +
> > +	chained_irq_enter(chip, desc);
> > +
> > +	regmap_read(tsadc->regs, MX25_TSC_TGSR, &status);
> > +
> > +	if (status & MX25_TGSR_GCQ_INT)
> > +		generic_handle_irq(irq_find_mapping(tsadc->domain, 1));
> > +
> > +	if (status & MX25_TGSR_TCQ_INT)
> > +		generic_handle_irq(irq_find_mapping(tsadc->domain, 0));
> > +
> > +	chained_irq_exit(chip, desc);
> > +}
> > +
> > +static int mx25_tsadc_domain_map(struct irq_domain *d, unsigned int irq,
> > +				 irq_hw_number_t hwirq)
> > +{
> > +	struct mx25_tsadc *tsadc = d->host_data;
> > +
> > +	irq_set_chip_data(irq, tsadc);
> > +	irq_set_chip_and_handler(irq, &dummy_irq_chip,
> > +				 handle_level_irq);
> > +	set_irq_flags(irq, IRQF_VALID);
> 
> I think you need to protect this with CONFIG_ARM.

Yes, added ifdef around set_irq_flags for IRQF_VALID.

> 
> > +	return 0;
> > +}
> > +
> > +static struct irq_domain_ops mx25_tsadc_domain_ops = {
> > +	.map = mx25_tsadc_domain_map,
> > +	.xlate = irq_domain_xlate_onecell,
> > +};
> > +
> > +static int mx25_tsadc_setup_irq(struct platform_device *pdev,
> > +				struct mx25_tsadc *tsadc)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct device_node *np = dev->of_node;
> > +	int irq;
> > +
> > +	irq = platform_get_irq(pdev, 0);
> > +	if (irq <= 0) {
> > +		dev_err(dev, "Failed to get irq\n");
> > +		return irq;
> > +	}
> > +
> > +	tsadc->domain = irq_domain_add_simple(np, 2, 0, &mx25_tsadc_domain_ops,
> > +					      tsadc);
> > +	if (!tsadc->domain) {
> > +		dev_err(dev, "Failed to add irq domain\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	irq_set_chained_handler(irq, mx25_tsadc_irq_handler);
> > +	irq_set_handler_data(irq, tsadc);
> > +
> > +	return 0;
> > +}
> > +
> > +static int mx25_tsadc_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct device_node *np = dev->of_node;
> > +	struct mx25_tsadc *tsadc;
> > +	struct resource *res;
> > +	int ret;
> > +	void __iomem *iomem;
> > +
> > +	tsadc = devm_kzalloc(dev, sizeof(*tsadc), GFP_KERNEL);
> > +	if (!tsadc)
> > +		return -ENOMEM;
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	iomem = devm_ioremap_resource(dev, res);
> > +	if (IS_ERR(iomem))
> > +		return PTR_ERR(iomem);
> > +
> > +	tsadc->regs = devm_regmap_init_mmio(dev, iomem,
> > +					    &mx25_tsadc_regmap_config);
> > +	if (IS_ERR(tsadc->regs)) {
> > +		dev_err(dev, "Failed to initialize regmap\n");
> > +		return PTR_ERR(tsadc->regs);
> > +	}
> > +
> > +	tsadc->clk = devm_clk_get(dev, "ipg");
> > +	if (IS_ERR(tsadc->clk)) {
> > +		dev_err(dev, "Failed to get ipg clock\n");
> > +		return PTR_ERR(tsadc->clk);
> > +	}
> > +
> > +	/* Enable clock and reset the component */
> > +	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_CLK_EN,
> > +			   MX25_TGCR_CLK_EN);
> > +	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_TSC_RST,
> > +			   MX25_TGCR_TSC_RST);
> > +
> > +	/* Setup powersaving mode, but enable internal reference voltage */
> > +	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_POWERMODE_MASK,
> > +			   MX25_TGCR_POWERMODE_SAVE);
> > +	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_INTREFEN,
> > +			   MX25_TGCR_INTREFEN);
> > +
> > +	ret = mx25_tsadc_setup_irq(pdev, tsadc);
> > +	if (ret)
> > +		return ret;
> > +
> > +	platform_set_drvdata(pdev, tsadc);
> > +
> > +	of_platform_populate(np, NULL, NULL, dev);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id mx25_tsadc_ids[] = {
> > +	{ .compatible = "fsl,imx25-tsadc" },
> > +	{ /* Sentinel */ }
> > +};
> > +
> > +static struct platform_driver mx25_tsadc_driver = {
> > +	.driver = {
> > +		.name = "mx25-tsadc",
> > +		.of_match_table = of_match_ptr(mx25_tsadc_ids),
> > +	},
> > +	.probe = mx25_tsadc_probe,
> 
> No remove()?  Nothing to clean-up?  Clocks off?  Reset?

No, Everything should cleanup on its own. No clocks enabled. This driver
mainly sets up some configuration for the other drivers using this unit.

> 
> > +};
> > +module_platform_driver(mx25_tsadc_driver);
> > +
> > +MODULE_DESCRIPTION("MFD for ADC/TSC for Freescale mx25");
> > +MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_ALIAS("platform:mx25-tsadc");
> > diff --git a/include/linux/mfd/imx25-tsadc.h b/include/linux/mfd/imx25-tsadc.h
> > new file mode 100644
> > index 000000000000..da348ac34a41
> > --- /dev/null
> > +++ b/include/linux/mfd/imx25-tsadc.h
> > @@ -0,0 +1,141 @@
> > +#ifndef _LINUX_INCLUDE_INPUT_IMX25_TSADC_H_
> > +#define _LINUX_INCLUDE_INPUT_IMX25_TSADC_H_
> 
> s/INPUT/MFD/

Fixed.

> 
> > +struct regmap;
> > +struct device;
> 
> What's this for?

Removed struct device. It was a leftover from a previous version.

Thanks,

Markus

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