Re: [PATCH V7 2/7] ARM: dts: imx6q-dhcom: Rework of the DHCOM GPIO pinctrls
From: Shawn Guo <shawnguo@kernel.org>
Date: 2021-08-09 07:32:59
On Mon, Aug 02, 2021 at 04:10:33PM +0200, Christoph Niedermaier wrote:
The function of each SoM pins is defined in the DHCOM standard [1] and subset of them is defined as GPIOs (pins A-W). To ensure the interchange- ability of the DHCOM SoMs, the function of the pins are fixed and cannot be changed. On board level the DHCOM GPIOs can be used associated with different blocks e.g. for interrupt or reset, but the function is always GPIO. If not used, they can be freely used in the user space. Therefore the whole configuration of SoM pins is made in the SoM DT. Defining the DHCOM GPIO pins as a separate pinctrl nodes makes moving a subset of them to an appropriate block pinctrl group easier on board level, since it is not necessary to have a large pinctrl hog group containing unrelated pinmux entries on board level. This also makes it easy to update the SoM DT without having to update all the board DTs too. If necessary it is also possible to change the electrical properties of the DHCOM GPIOs by overwriting the pinctrl on board level. [1] https://wiki.dh-electronics.com/images/2/2e/DOC_DHCOM-Standard-Specification_R01_2016-11-17.pdf Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Fabio Estevam <redacted> Cc: Marek Vasut <marex@denx.de> Cc: NXP Linux Team <redacted> Cc: kernel@dh-electronics.com To: linux-arm-kernel@lists.infradead.org
Applied, thanks! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel