From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clark Wang Subject: [PATCH V2 0/8] spi: lpspi: Fix bugs and Add some functions support Date: Wed, 6 Mar 2019 06:30:32 +0000 Message-ID: <20190306063020.793-1-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" 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, Sorry for replying so late. This patchset contains changes based on your an= d other reviewers' comments. As subject, these fucntions support, including: - Support i.MX8 series boards; - Support cs-gpio fucntion; - Support DMA mode for both master and salve mode. 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 I test in slave mode is 15MHz(i.MX7ULP)= , 20MHz(i.MX8 series). In order to reach the maximum speed which is mentioned in datasheet, the load of connect wires between master a= nd slave should be less than 15pF. Each patch in this patchset should base on the previous one when applied. Thank you! Clark Wang (7): spi: lpspi: Add i.MX8 boards support for lpspi doc: lpspi: Document DT bindings for LPSPI clocks spi: lpspi: add the error info of transfer speed setting spi: lpspi: use the core way to implement cs-gpio function spi: lpspi: add dma mode support spi: lpspi: Add the missing NULL check spi: lpspi: Code cleanup Han Xu (1): spi: lpspi: enable runtime pm for lpspi .../devicetree/bindings/spi/spi-fsl-lpspi.txt | 10 +- drivers/spi/spi-fsl-lpspi.c | 543 ++++++++++++++++-- 2 files changed, 495 insertions(+), 58 deletions(-) --=20 2.17.1