From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guodong Xu Subject: [PATCH v3 0/2] mmc: dw_mmc: controller reset support Date: Wed, 30 Mar 2016 15:24:54 +0800 Message-ID: <1459322696-29919-1-git-send-email-guodong.xu@linaro.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: shawn.lin@rock-chips.com, jh80.chung@samsung.com, --to=robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, ulf.hansson@linaro.org, guodong.xu@linaro.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org mmc controller registers may in abnormal state if mmc is used in bootloader, eg. to load kernel from eMMC. Some controllers cann't clear their registers when clk is set. They use dedicated reset logics to do this. In this patch, a 'resets' property is added into dw_mmc dts node. When driver does parse_dt and probe, it calls reset API to deassert the 'reset' of dw_mmc host controller. When probe error or remove, it calls reset API to assert it. Chip vendor's actual reset logics is implemented in reset driver, not in dw_mmc code. Please also refer to Documentation/devicetree/bindings/reset/reset.txt Guodong Xu (2): Documentation: synopsys-dw-mshc: add binding for resets mmc: dw_mmc: add resets support to dw_mmc .../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 4 ++++ drivers/mmc/host/dw_mmc.c | 20 +++++++++++++++++++- include/linux/mmc/dw_mmc.h | 6 ++++-- 3 files changed, 27 insertions(+), 3 deletions(-) -- 1.9.1