[PATCH v7 4/8] mfd: fsl imx25 Touchscreen ADC driver
Markus Pargmann
mpa at pengutronix.de
Tue Mar 24 07:33:14 PDT 2015
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 at pengutronix.de>
> > Signed-off-by: Denis Carikli <denis at eukrea.com>
> > Acked-by: Jonathan Cameron <jic23 at 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 at 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 at 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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Industrial Linux Solutions | http://www.pengutronix.de/ |
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