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Date: Wed, 26 Jun 2024 13:29:24 +0800 From: Kent Gibson <warthog618@...il.com> To: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, brgl@...ev.pl, linus.walleij@...aro.org Cc: Kent Gibson <warthog618@...il.com>, corbet@....net, linux-doc@...r.kernel.org Subject: [PATCH 3/4] Documentation: gpio: Reconfiguration with unset direction (uAPI v1) Update description of reconfiguration rules, adding requirement that a direction flag be set or the configuration is considered invalid. Signed-off-by: Kent Gibson <warthog618@...il.com> --- .../userspace-api/gpio/gpio-handle-set-config-ioctl.rst | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst b/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst index d002a84681ac..a03f30db63ab 100644 --- a/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst +++ b/Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst @@ -43,7 +43,10 @@ The configuration applies to all requested lines. The same :ref:`gpio-get-linehandle-config-rules` and :ref:`gpio-get-linehandle-config-support` that apply when requesting the -lines also apply when updating the line configuration. +lines also apply when updating the line configuration, with the additional +restriction that a direction flag must be set. Requesting an invalid +configuration, including without a direction flag set, is an error +(**EINVAL**). The motivating use case for this command is changing direction of bi-directional lines between input and output, but it may be used more -- 2.39.2
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