Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752783AbbFHMHo (ORCPT ); Mon, 8 Jun 2015 08:07:44 -0400 Received: from down.free-electrons.com ([37.187.137.238]:39223 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752544AbbFHMHS (ORCPT ); Mon, 8 Jun 2015 08:07:18 -0400 Date: Mon, 8 Jun 2015 14:07:13 +0200 From: Alexandre Belloni To: Sergey Yanovich Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Kumar Gala , Randy Dunlap , Russell King , Alessandro Zummo , Grant Likely , Heikki Krogerus , "open list:OPEN FIRMWARE AND..." , "open list:DOCUMENTATION" , rtc-linux@googlegroups.com Subject: Re: [v4,09/21] rtc: support DS1302 RTC on ICP DAS LP-8x4x Message-ID: <20150608120713.GA5222@piout.net> References: <1397668667-27328-3-git-send-email-ynvich@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1397668667-27328-3-git-send-email-ynvich@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5673 Lines: 212 Hi Sergey, Are you still interested in seeing that patch going upstream? On 16/04/2014 at 21:17:14 +0400, Sergey Yanovich wrote : > Signed-off-by: Sergei Ianovich > --- > v3..v4 > * move DTS bindings to a different patch (8/21) > > v2..v3 > * use usleep_range instead of custom nsleep > * number change (07/16 -> 09/21) > > v0..v2 > * use device tree > * use devm helpers where possible > > .../devicetree/bindings/rtc/rtc-ds1302.txt | 14 +++ > arch/arm/configs/lp8x4x_defconfig | 1 + > drivers/rtc/Kconfig | 2 +- > drivers/rtc/rtc-ds1302.c | 100 ++++++++++++++++++++- > 4 files changed, 114 insertions(+), 3 deletions(-) > create mode 100644 Documentation/devicetree/bindings/rtc/rtc-ds1302.txt > > diff --git a/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt b/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt > new file mode 100644 > index 0000000..810613b > --- /dev/null > +++ b/Documentation/devicetree/bindings/rtc/rtc-ds1302.txt > @@ -0,0 +1,14 @@ > +* Dallas Semiconductor DS-1302 RTC > + > +Simple device which could be used to store date/time between reboots. > + > +Required properties: > +- compatible : Should be "dallas,rtc-ds1302" > +- reg : Should be address and size of IO memory region > + > +Examples: > + > +rtc@40900000 { > + compatible = "dallas,rtc-ds1302"; > + reg = <0x1700901c 0x1>; > +}; > diff --git a/arch/arm/configs/lp8x4x_defconfig b/arch/arm/configs/lp8x4x_defconfig > index 9f1efb6..d60e37a 100644 > --- a/arch/arm/configs/lp8x4x_defconfig > +++ b/arch/arm/configs/lp8x4x_defconfig > @@ -141,6 +141,7 @@ CONFIG_LEDS_GPIO=y > CONFIG_LEDS_TRIGGERS=y > CONFIG_LEDS_TRIGGER_HEARTBEAT=y > CONFIG_RTC_CLASS=y > +CONFIG_RTC_DRV_DS1302=y > CONFIG_RTC_DRV_PXA=m > # CONFIG_IOMMU_SUPPORT is not set > CONFIG_EXT2_FS=m > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 2e565f8..80aaaa1 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -710,7 +710,7 @@ config RTC_DRV_DS1286 > > config RTC_DRV_DS1302 > tristate "Dallas DS1302" > - depends on SH_SECUREEDGE5410 > + depends on SH_SECUREEDGE5410 || (ARCH_PXA && HIGH_RES_TIMERS) > help > If you say yes here you get support for the Dallas DS1302 RTC chips. > > diff --git a/drivers/rtc/rtc-ds1302.c b/drivers/rtc/rtc-ds1302.c > index 07e8d79..3c49023 100644 > --- a/drivers/rtc/rtc-ds1302.c > +++ b/drivers/rtc/rtc-ds1302.c > @@ -50,7 +50,7 @@ > #define ds1302_set_tx() > #define ds1302_set_rx() > > -static inline int ds1302_hw_init(void) > +static inline int ds1302_hw_init(struct platform_device *pdev) > { > return 0; > } > @@ -86,6 +86,101 @@ static inline int ds1302_rxbit(void) > return !!(get_dp() & RTC_IODATA); > } > > +#elif defined(CONFIG_ARCH_PXA) && defined(CONFIG_HIGH_RES_TIMERS) > + > +#include > +#include > + > +#define RTC_CE 0x01 > +#define RTC_CLK 0x02 > +#define RTC_nWE 0x04 > +#define RTC_IODATA 0x08 > + > +static unsigned long ds1302_state; > + > +static void *mem; > + > +static inline int ds1302_hw_init(struct platform_device *pdev) > +{ > + struct resource *r; > + > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!r) > + return -ENODEV; > + > + mem = devm_ioremap_resource(&pdev->dev, r); > + if (!mem) > + return -EFAULT; > + > + return 0; > +} > + > +static inline void ds1302_reset(void) > +{ > + ds1302_state = 0; > + iowrite8(ds1302_state, mem); > + usleep_range(4, 5); > +} > + > +static inline void ds1302_clock(void) > +{ > + usleep_range(1, 2); > + ds1302_state |= RTC_CLK; > + iowrite8(ds1302_state, mem); > + usleep_range(1, 2); > + ds1302_state &= ~RTC_CLK; > + iowrite8(ds1302_state, mem); > +} > + > +static inline void ds1302_start(void) > +{ > + ds1302_state &= ~RTC_CLK; > + ds1302_state |= RTC_CE; > + iowrite8(ds1302_state, mem); > + usleep_range(3, 4); > +} > + > +static inline void ds1302_stop(void) > +{ > + ds1302_state &= ~RTC_CE; > + iowrite8(ds1302_state, mem); > +} > + > +static inline void ds1302_set_tx(void) > +{ > + ds1302_state &= ~RTC_nWE; > + iowrite8(ds1302_state, mem); > +} > + > +static inline void ds1302_set_rx(void) > +{ > + ds1302_state |= RTC_nWE; > + iowrite8(ds1302_state, mem); > +} > + > +static inline void ds1302_txbit(int bit) > +{ > + if (bit) > + ds1302_state |= RTC_IODATA; > + else > + ds1302_state &= ~RTC_IODATA; > + iowrite8(ds1302_state, mem); > +} > + > +static inline int ds1302_rxbit(void) > +{ > + return ioread8(mem) & 0x1; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id ds1302_dt_ids[] = { > + { .compatible = "dallas,rtc-ds1302" }, > + { } > +}; > + > +MODULE_DEVICE_TABLE(of, ds1302_dt_ids); > +#endif > + > #else > #error "Add support for your platform" > #endif > @@ -216,7 +311,7 @@ static int __init ds1302_rtc_probe(struct platform_device *pdev) > { > struct rtc_device *rtc; > > - if (ds1302_hw_init()) { > + if (ds1302_hw_init(pdev)) { > dev_err(&pdev->dev, "Failed to init communication channel"); > return -EINVAL; > } > @@ -245,6 +340,7 @@ static struct platform_driver ds1302_platform_driver = { > .driver = { > .name = DRV_NAME, > .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(ds1302_dt_ids), > }, > }; > -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/