Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757524AbbLAXkt (ORCPT ); Tue, 1 Dec 2015 18:40:49 -0500 Received: from muru.com ([72.249.23.125]:49907 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757446AbbLAXit (ORCPT ); Tue, 1 Dec 2015 18:38:49 -0500 From: Tony Lindgren To: linux-kernel@vger.kernel.org Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Brian Hutchinson , Delio Brignoli , Neil Armstrong , Matthijs van Duin , Philipp Rosenberger , Paul Walmsley Subject: [PATCH 05/10] ARM: OMAP2+: Disable GPIO softreset for dm81xx Date: Tue, 1 Dec 2015 15:38:18 -0800 Message-Id: <1449013103-23238-6-git-send-email-tony@atomide.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1449013103-23238-1-git-send-email-tony@atomide.com> References: <1449013103-23238-1-git-send-email-tony@atomide.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2073 Lines: 61 Looks like GPIO softreset status bit on both dm8168 and dm8148 is broken and only goes high initially. After writing to sysc softreset bit, the resetdone bit never goes high again. I noticed this as GPIOs are enabled from u-boot at least on t410. And this can be tested easliy with the following commands in u-boot: # mw.l 0x4818155c 0x2 # md.l 0x48032114 1 48032114: 00000001 .... # mw.l 0x48032010 0x2 # md.l 0x48032114 1 48032114: 00000000 .... Looks like the GPIO module is functional even with the resetdone bit down. Let's just tag the GPIOs for dm81xx with HWMOD_INIT_NO_RESET. Cc: Paul Walmsley Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/omap_hwmod_81xx_data.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mach-omap2/omap_hwmod_81xx_data.c b/arch/arm/mach-omap2/omap_hwmod_81xx_data.c index 1b96cdf..440fd6c 100644 --- a/arch/arm/mach-omap2/omap_hwmod_81xx_data.c +++ b/arch/arm/mach-omap2/omap_hwmod_81xx_data.c @@ -432,6 +432,7 @@ static struct omap_hwmod_ocp_if dm81xx_l4_ls__elm = { .user = OCP_USER_MPU, }; +/* On dm81xx RESETDONE bit seems to never goes high again after SOFTRESET */ static struct omap_hwmod_class_sysconfig dm81xx_gpio_sysc = { .rev_offs = 0x0000, .sysc_offs = 0x0010, @@ -463,6 +464,7 @@ static struct omap_hwmod dm81xx_gpio1_hwmod = { .name = "gpio1", .clkdm_name = "alwon_l3s_clkdm", .class = &dm81xx_gpio_hwmod_class, + .flags = HWMOD_INIT_NO_RESET, .main_clk = "sysclk6_ck", .prcm = { .omap4 = { @@ -490,6 +492,7 @@ static struct omap_hwmod dm81xx_gpio2_hwmod = { .clkdm_name = "alwon_l3s_clkdm", .class = &dm81xx_gpio_hwmod_class, .main_clk = "sysclk6_ck", + .flags = HWMOD_INIT_NO_RESET, .prcm = { .omap4 = { .clkctrl_offs = DM81XX_CM_ALWON_GPIO_1_CLKCTRL, -- 2.6.2 -- 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/