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Wed, 17 Oct 2018 14:42:07 +0100 (BST) Received: from AMDC2765.digital.local ([106.116.147.25]) by eusync4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0PGQ001A0WQ1IZ80@eusync4.samsung.com>; Wed, 17 Oct 2018 14:42:07 +0100 (BST) From: Marek Szyprowski To: linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Marek Szyprowski , Will Deacon , Catalin Marinas , Marc Zyngier , Thomas Gleixner , Daniel Lezcano , Krzysztof Kozlowski , Chanwoo Choi , Bartlomiej Zolnierkiewicz , Inki Dae Subject: [PATCH v3 4/6] clocksource: exynos_mct: Add arch_timer cooperation mode for ARM64 Date: Wed, 17 Oct 2018 15:41:57 +0200 Message-id: <20181017134159.9656-5-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-reply-to: <20181017134159.9656-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPIsWRmVeSWpSXmKPExsWy7djP87r6NsejDWbOUbHYOGM9q8X7ZT2M Fte/PGe1mPdZ1mLS/QksFufPb2C32PT4GqvF5V1z2CxmnN/HZLH2yF12i793/rFZbN40ldni 5ccTLA68HmvmrWH02LSqk83jzrU9bB7vzp1j99i8pN6jb8sqRo/Pm+QC2KO4bFJSczLLUov0 7RK4Mubf0S5YxVWxYOJipgbGgxxdjJwcEgImEqubnzB3MXJxCAmsYJTYcG0HC4TzmVFizbyn LDBV0xY8g0osY5R4dHUblNPAJPHg10M2kCo2AUOJrrddYLaIQLZE5+MHjCA2s8AiZokDx4RB bGGBGIlzzz+CTWURUJXY+PYzE4jNK2AjMWfbGlaIbfISqzccALqJg4NTwFZibX8VyC4JgT1s Ej9+TmeEqHGR+HZwNTOELSzx6vgWdghbRqKz4yATREMzo0T7jFnsEE4Po8TWOTvYIKqsJQ4f v8gKcR2fxKRt08G2SQjwSnS0CUGUeEhceHCTEeLLCYwSG9fMYJ3AKLmAkWEVo3hqaXFuemqx YV5quV5xYm5xaV66XnJ+7iZGYDSf/nf80w7Gr5eSDjEKcDAq8fDuEDsWLcSaWFZcmXuIUYKD WUmEt0rxeLQQb0piZVVqUX58UWlOavEhRmkOFiVx3mXzNkYLCaQnlqRmp6YWpBbBZJk4OKUa GFvT3lxdsoX3wDdh3j5jSd/Tb8Klt4m2athN5U6t+hcX67pRLkT8kNf+FqGpM42uii7YZe87 uzJA8MuelVn2Ma28y67NCFrFM//Q0WMex5i+zWNrK3XLOqGZm/pv5jsm/t612V9u7n++dd2P +bfieBW/aAmwujW0eQb8VBAu/Liqjy02YHWLtBJLcUaioRZzUXEiALv+u7ziAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNLMWRmVeSWpSXmKPExsVy+t/xa7r6NsejDY7vZ7PYOGM9q8X7ZT2M Fte/PGe1mPdZ1mLS/QksFufPb2C32PT4GqvF5V1z2CxmnN/HZLH2yF12i793/rFZbN40ldni 5ccTLA68HmvmrWH02LSqk83jzrU9bB7vzp1j99i8pN6jb8sqRo/Pm+QC2KO4bFJSczLLUov0 7RK4Mubf0S5YxVWxYOJipgbGgxxdjJwcEgImEtMWPGPpYuTiEBJYwiix6cQWZginiUniwcYJ bCBVbAKGEl1vu8BsEYFsifl7u9lBbGaBJcwSN+87gNjCAjES555/ZAGxWQRUJTa+/cwEYvMK 2EjM2baGFWKbvMTqDQeAFnBwcArYSqztrwIJCwGVvPw8l2kCI88CRoZVjCKppcW56bnFhnrF ibnFpXnpesn5uZsYgUG47djPzTsYL20MPsQowMGoxMO7Q+xYtBBrYllxZe4hRgkOZiUR3irF 49FCvCmJlVWpRfnxRaU5qcWHGKU5WJTEec8bVEYJCaQnlqRmp6YWpBbBZJk4OKUaGLt9a83L t2Qs6vrD/Nw8+GnnZlfZ/q267hftF5ic+FJ8sdlO66q1XKfw1xeapXXiMswyHQdMX2rMOhc6 y5g94GOu+8WDCxNYNL//2iHO8sxiltnWiM8LyifV1R2s2ffhwh+Z2mlps46dO2z1Q1mYZ7Xb JDM3id/GGbypvb27TCfwyxv1XxX7rsRSnJFoqMVcVJwIAFVxb4w+AgAA X-CMS-MailID: 20181017134207eucas1p1b938eefe31fc47baaf538c9ebafc1a7e X-Msg-Generator: CA CMS-TYPE: 201P X-CMS-RootMailID: 20181017134207eucas1p1b938eefe31fc47baaf538c9ebafc1a7e References: <20181017134159.9656-1-m.szyprowski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To get ARM Architected Timers working on Samsung Exynos SoCs, one has to first configure and enable Exynos Multi-Core Timer, because they both share some common hardware blocks (global system counter). This patch adds a mode of cooperation with arch_timer driver, so kernel can use CP15 based timer interface via arch_timer driver, which is mandatory on ARM64. In such mode MCT driver only enables its clocks and starts global timer. Everything else will be handled by arch_timer driver. Signed-off-by: Marek Szyprowski --- drivers/clocksource/exynos_mct.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c index 02ad55db390b..1b19a4f03929 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -606,6 +606,15 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type) if (ret) return ret; + if (IS_ENABLED(CONFIG_ARM64) && IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) { + struct device_node *np = of_find_compatible_node(NULL, NULL, + "arm,armv8-timer"); + if (np) { + of_node_put(np); + exynos4_mct_frc_start(); + return 0; + } + } ret = exynos4_timer_interrupts(np, int_type); if (ret) -- 2.17.1