]> git.dujemihanovic.xyz Git - u-boot.git/commit
ARM: dts: dra7-mmc-iodelay: Add a new pinctrl group for clk line without pullup
authorFaiz Abbas <faiz_abbas@ti.com>
Thu, 20 Jun 2019 09:37:19 +0000 (15:07 +0530)
committerTom Rini <trini@konsulko.com>
Sat, 27 Jul 2019 02:24:10 +0000 (22:24 -0400)
commit461918d7df7bd356717a5f81ca58f1c8ca7ae1fb
tree95b32f7b35940779dc322bbce3fcc7516d40a9aa
parent697a689d76ef463623371779c78a97c13477c955
ARM: dts: dra7-mmc-iodelay: Add a new pinctrl group for clk line without pullup

During a short period when the bus voltage is switched from 3.3v to 1.8v,
(to enumerate UHS mode), the mmc module is disabled and the mmc IO lines
are kept in a state according to the programmed pad mux pull type.

According to 4.2.4.2 Timing to Switch Signal Voltage in "SD Specifications
Part 1 Physical Layer Specification Version 5.00 February 22, 2016", the
host should hold CLK low for at least 5ms.

In order to keep the card line low during voltage switch, the pad mux of
mmc1_clk line should be configured to pull down.

Add a new pinctrl group for clock line without pullup to be used in boards
where mmc1_clk line is not connected to an external pullup.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
arch/arm/dts/am571x-idk.dts
arch/arm/dts/am572x-idk.dts
arch/arm/dts/dra7-mmc-iodelay.dtsi [new file with mode: 0644]