From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751917AbdKFG7W (ORCPT ); Mon, 6 Nov 2017 01:59:22 -0500 Received: from fllnx210.ext.ti.com ([198.47.19.17]:37288 "EHLO fllnx210.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751307AbdKFG7U (ORCPT ); Mon, 6 Nov 2017 01:59:20 -0500 Subject: Re: [PATCH] rtc: omap: Support scratch registers To: Sekhar Nori , Alexandre Belloni , CC: , Linux OMAP List References: <20171031162731.27019-1-alexandre.belloni@free-electrons.com> <600fd106-9f79-0f5a-a2fd-e6b067785c17@ti.com> From: Keerthy Message-ID: <4741d4c7-d6f7-ecdb-1eed-1293175f38d9@ti.com> Date: Mon, 6 Nov 2017 12:29:15 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <600fd106-9f79-0f5a-a2fd-e6b067785c17@ti.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 06 November 2017 12:25 PM, Sekhar Nori wrote: > + linux omap list > > On Tuesday 31 October 2017 09:57 PM, Alexandre Belloni wrote: >> Register an nvmem device to expose the 3 scratch registers (total of 12 >> bytes) to both userspace and kernel space. >> >> Signed-off-by: Alexandre Belloni > > Looks good to me. > > Reviewed-by: Sekhar Nori > > Curious on what you are using these registers for. This is in response to this: https://patchwork.kernel.org/patch/9684955/ > > Thanks, > Sekhar > >> --- >> drivers/rtc/rtc-omap.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 45 insertions(+) >> >> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c >> index d56d937966dc..1d666ac9ef70 100644 >> --- a/drivers/rtc/rtc-omap.c >> +++ b/drivers/rtc/rtc-omap.c >> @@ -70,6 +70,10 @@ >> #define OMAP_RTC_COMP_MSB_REG 0x50 >> #define OMAP_RTC_OSC_REG 0x54 >> >> +#define OMAP_RTC_SCRATCH0_REG 0x60 >> +#define OMAP_RTC_SCRATCH1_REG 0x64 >> +#define OMAP_RTC_SCRATCH2_REG 0x68 >> + >> #define OMAP_RTC_KICK0_REG 0x6c >> #define OMAP_RTC_KICK1_REG 0x70 >> >> @@ -667,6 +671,45 @@ static struct pinctrl_desc rtc_pinctrl_desc = { >> .owner = THIS_MODULE, >> }; >> >> +static int omap_rtc_scratch_read(void *priv, unsigned int offset, void *_val, >> + size_t bytes) >> +{ >> + struct omap_rtc *rtc = priv; >> + u32 *val = _val; >> + int i; >> + >> + for (i = 0; i < bytes / 4; i++) >> + val[i] = rtc_readl(rtc, >> + OMAP_RTC_SCRATCH0_REG + offset + (i * 4)); >> + >> + return 0; >> +} >> + >> +static int omap_rtc_scratch_write(void *priv, unsigned int offset, void *_val, >> + size_t bytes) >> +{ >> + struct omap_rtc *rtc = priv; >> + u32 *val = _val; >> + int i; >> + >> + rtc->type->unlock(rtc); >> + for (i = 0; i < bytes / 4; i++) >> + rtc_writel(rtc, >> + OMAP_RTC_SCRATCH0_REG + offset + (i * 4), val[i]); >> + rtc->type->lock(rtc); >> + >> + return 0; >> +} >> + >> +static struct nvmem_config omap_rtc_nvmem_config = { >> + .name = "omap_rtc_scratch", >> + .word_size = 4, >> + .stride = 4, >> + .size = OMAP_RTC_KICK0_REG - OMAP_RTC_SCRATCH0_REG, >> + .reg_read = omap_rtc_scratch_read, >> + .reg_write = omap_rtc_scratch_write, >> +}; >> + >> static int omap_rtc_probe(struct platform_device *pdev) >> { >> struct omap_rtc *rtc; >> @@ -804,6 +847,8 @@ static int omap_rtc_probe(struct platform_device *pdev) >> } >> >> rtc->rtc->ops = &omap_rtc_ops; >> + omap_rtc_nvmem_config.priv = rtc; >> + rtc->rtc->nvmem_config = &omap_rtc_nvmem_config; >> >> /* handle periodic and alarm irqs */ >> ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0, >> -- >> 2.15.0.rc2 >> >