From: Guodong Xu <guodong.xu@linaro.org>
To: heiko@sntech.de, shawn.lin@rock-chips.com,
jh80.chung@samsung.com, robh+dt@kernel.org, mark.rutland@arm.com,
ulf.hansson@linaro.org, guodong.xu@linaro.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org
Subject: [PATCH v5 0/2] mmc: dw_mmc: host controller reset support
Date: Fri, 12 Aug 2016 16:51:24 +0800 [thread overview]
Message-ID: <1470991886-22412-1-git-send-email-guodong.xu@linaro.org> (raw)
mmc host 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
triiger 'reset' of dwmmc 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
Changelog:
v5:
* rebase onto https://github.com/jh80chung/dw-mmc
v4:
* add reset_control_assert() and usleep() before calling _deassert().
Guodong Xu (2):
Documentation: synopsys-dw-mshc: add binding for resets
mmc: dw_mmc: add reset support to dwmmc host controller
.../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 4 ++++
drivers/mmc/host/dw_mmc.c | 23 +++++++++++++++++++++-
include/linux/mmc/dw_mmc.h | 2 ++
3 files changed, 28 insertions(+), 1 deletion(-)
--
1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Guodong Xu <guodong.xu-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org,
shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org,
jh80.chung-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
guodong.xu-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH v5 0/2] mmc: dw_mmc: host controller reset support
Date: Fri, 12 Aug 2016 16:51:24 +0800 [thread overview]
Message-ID: <1470991886-22412-1-git-send-email-guodong.xu@linaro.org> (raw)
mmc host 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
triiger 'reset' of dwmmc 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
Changelog:
v5:
* rebase onto https://github.com/jh80chung/dw-mmc
v4:
* add reset_control_assert() and usleep() before calling _deassert().
Guodong Xu (2):
Documentation: synopsys-dw-mshc: add binding for resets
mmc: dw_mmc: add reset support to dwmmc host controller
.../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 4 ++++
drivers/mmc/host/dw_mmc.c | 23 +++++++++++++++++++++-
include/linux/mmc/dw_mmc.h | 2 ++
3 files changed, 28 insertions(+), 1 deletion(-)
--
1.9.1
--
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WARNING: multiple messages have this Message-ID (diff)
From: guodong.xu@linaro.org (Guodong Xu)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 0/2] mmc: dw_mmc: host controller reset support
Date: Fri, 12 Aug 2016 16:51:24 +0800 [thread overview]
Message-ID: <1470991886-22412-1-git-send-email-guodong.xu@linaro.org> (raw)
mmc host 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
triiger 'reset' of dwmmc 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
Changelog:
v5:
* rebase onto https://github.com/jh80chung/dw-mmc
v4:
* add reset_control_assert() and usleep() before calling _deassert().
Guodong Xu (2):
Documentation: synopsys-dw-mshc: add binding for resets
mmc: dw_mmc: add reset support to dwmmc host controller
.../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 4 ++++
drivers/mmc/host/dw_mmc.c | 23 +++++++++++++++++++++-
include/linux/mmc/dw_mmc.h | 2 ++
3 files changed, 28 insertions(+), 1 deletion(-)
--
1.9.1
next reply other threads:[~2016-08-12 8:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20160812085218epcas1p34d84a42a931dcc09fe7a77be59065499@epcas1p3.samsung.com>
2016-08-12 8:51 ` Guodong Xu [this message]
2016-08-12 8:51 ` [PATCH v5 0/2] mmc: dw_mmc: host controller reset support Guodong Xu
2016-08-12 8:51 ` Guodong Xu
2016-08-12 8:51 ` [PATCH v5 1/2] Documentation: synopsys-dw-mshc: add binding for resets Guodong Xu
2016-08-12 8:51 ` Guodong Xu
2016-08-12 8:51 ` Guodong Xu
2016-08-12 8:51 ` [PATCH v5 2/2] mmc: dw_mmc: add reset support to dwmmc host controller Guodong Xu
2016-08-12 8:51 ` Guodong Xu
2016-08-12 9:19 ` [PATCH v5 0/2] mmc: dw_mmc: host controller reset support Jaehoon Chung
2016-08-12 9:19 ` Jaehoon Chung
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