Re: [PATCH 1/2] ARM: dts: imx: change the spi-nor tx
From: Shawn Guo <shawnguo@kernel.org>
Date: 2021-10-04 03:26:05
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On Fri, Aug 20, 2021 at 05:29:49PM +0800, haibo.chen@nxp.com wrote:
From: Haibo Chen <haibo.chen@nxp.com>
Before commit 0e30f47232ab5 ("mtd: spi-nor: add support for DTR protocol"),
for all PP command, it only support 1-1-1 mode, no matter the tx setting
in dts. But after the upper commit, the logic change. It will choose
the best mode(fastest mode) which flash device and spi-nor host controller
both support.
Though the spi-nor device on imx6sx-sdb/imx6ul(l/z)-14x14-evk board
do not support PP-1-4-4/PP-1-1-4, but if tx is 4 in dts file, it will also
impact the read mode selection. For the spi-nor device on the upper mentioned
boards, they support read 1-4-4 mode and read 1-1-4 mode according to the
device internal sfdp register. But qspi host controller do not support
read 1-4-4 mode. so need to set the tx to 1, let the common code finally
select read 1-1-4 mode, PP-1-1-1 mode.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>Applied both, thanks! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel