From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clark Wang Subject: [PATCH 0/8] spi: lpspi: Fix bugs and Add some functions support Date: Mon, 7 Jan 2019 07:47:32 +0000 Message-ID: <20190107074639.6336-1-xiaoning.wang@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Cc: "linux-spi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Clark Wang To: "broonie@kernel.org" Return-path: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org Hi Mark, As subject, these fucntions support, including: - Support i.MX8 series boards; - Support cs-gpio fucntion; - Support DMA mode for both master and salve mode. >>From patch 3 to 6 are some bug-fix for PIO mode. In order to avoid data los= s and improve data transmission stability. These are some notes about cs-gpio and DMA: - cs-gpio: Because LPSPI driver don't use default implementation of transfer_one_message(), I do the cs-gpio control way as same as the way used in spi core; - DMA: Any frame length longer than half txfifosize will be sent by DMA mode. For now, there are some limits: 1. The maximum transfer speed in master mode depends on the slave dev= ice, at least 40MHz on i.MX8 series (tested by spi-nor on 8qm-lpddr4-ar= m2 base board); 2. The maximum transfer speed in slave mode is 15MHz(i.MX7ULP), 22MHz(i.MX8 series). Clark Wang (8): spi: lpspi: Add i.MX8 boards support for lpspi spi: lpspi: enable runtime pm for lpspi spi: lpspi: Improve the stability of lpspi data transmission spi: lpspi: Fix wrong transmission when don't use CONT spi: lpspi: Fix CLK pin becomes low before one transfer spi: lpspi: add the error info of transfer speed setting spi: lpspi: Add cs-gpio support spi: lpspi: add dma mode support drivers/spi/spi-fsl-lpspi.c | 612 ++++++++++++++++++++++++++++++++---- 1 file changed, 552 insertions(+), 60 deletions(-) --=20 2.17.1