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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i9Rfc-0005fo-3N; Sun, 15 Sep 2019 10:22:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1i9RfY-0005fD-0C for linux-arm-kernel@lists.infradead.org; Sun, 15 Sep 2019 10:22:13 +0000 Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 07FD220692; Sun, 15 Sep 2019 10:22:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568542931; bh=jQ+dE0FqCn4YmPt8H5tQ6UZBzpg1F2BEc20j8Ptglzk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Y5BbD16mnzz7OhM8IfFnS1ggxaS2GA7BFcYFp/ccokTArfJNqni/tOl8YgI7yBU1a 02MB/74LKXFKXF/CZtGJW3ui1b5ObbJmJeNgeAeV4H9IUbuVJb7IUfH4AHojzPQ2RJ MHoECe9e7kfh2HZwSU+AzNE8mmhDT2tYuMWweIsI= Date: Sun, 15 Sep 2019 11:22:05 +0100 From: Jonathan Cameron To: Alexandru Ardelean Subject: Re: [RFC PATCH 00/15] Unify SPI delays into an `struct spi_delay` Message-ID: <20190915112205.0007d62d@archlinux> In-Reply-To: <20190913114550.956-1-alexandru.ardelean@analog.com> References: <20190913114550.956-1-alexandru.ardelean@analog.com> X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190915_032212_102621_8B390CF8 X-CRM114-Status: GOOD ( 18.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: f.fainelli@gmail.com, baolin.wang@linaro.org, linux-iio@vger.kernel.org, zhang.lyra@gmail.com, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, broonie@kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-tegra@vger.kernel.org, orsonzhai@gmail.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 13 Sep 2019 14:45:35 +0300 Alexandru Ardelean wrote: > Initially, I started this patchset thinking: "we need a new delay for > something-something" (in case someone is curios, we need a CS-hold-time for > the first transfer, because the CS wakes a chip from sleep-mode). > > Then I added the delay, and felt a bit dirty-inside about adding a new one > (just like that), and decided to look at maybe cleaning things up a bit, > and a few days later, I got here. > > Full disclaimer: this patchset is not complete. It's an RFC. > It's based on top of Jonathan's `iio/togreg` branch which also includes the > ADIS driver library changes and also includes `cs_change_delay`. > > I'll send a V2 patchset, which just the first 4 patches, since I feel that > those are a bit more complete. > > I thought about just sending the first 4 patches on-their-own, but I > figured that the whole series (even if not complete) serves as a better > explanation about the whole "why?". > > Hopefully, this can sort-of-explain things. > I'll reference this RFC on the next series. General approach looks sensible to me. Over to SPI specialists on whether this is a sensible bit of unification to do. Jonathan > > Thanks > > Alexandru Ardelean (15): > spi: move `cs_change_delay` backwards compat logic outside switch > spi: introduce spi_delay struct as "value + unit" & spi_delay_exec() > spi: make `cs_change_delay` the first user of the `spi_delay` logic > iio: imu: adis: convert cs_change_delay to spi_delay struct > spi: sprd: convert transfer word delay to spi_delay struct > spi: orion: use new `word_delay` field for SPI transfers > spi: spidev: use new `word_delay` field for spi transfers > spi: core,atmel: convert `word_delay_usecs` -> `word_delay` for > spi_device > spi: introduce `delay` field for `spi_transfer` + spi_transfer_exec() > spi: use new `spi_transfer_delay` helper where straightforward > spi: tegra114: use `spi_transfer_delay` helper > spi: spi-loopback-test: use new `delay` field > spi: spidev: use new `delay` field for spi transfers > spi: tegra114: change format for `spi_set_cs_timing()` function > spi: implement SW control for CS times > > drivers/iio/imu/adis.c | 24 ++--- > drivers/spi/spi-atmel.c | 29 +++++- > drivers/spi/spi-bcm63xx-hsspi.c | 3 +- > drivers/spi/spi-cavium.c | 3 +- > drivers/spi/spi-fsl-dspi.c | 3 +- > drivers/spi/spi-fsl-espi.c | 3 +- > drivers/spi/spi-fsl-spi.c | 3 +- > drivers/spi/spi-loopback-test.c | 12 ++- > drivers/spi/spi-mpc512x-psc.c | 3 +- > drivers/spi/spi-mpc52xx-psc.c | 3 +- > drivers/spi/spi-omap-100k.c | 3 +- > drivers/spi/spi-orion.c | 6 +- > drivers/spi/spi-pl022.c | 25 +++-- > drivers/spi/spi-sc18is602.c | 3 +- > drivers/spi/spi-sh-hspi.c | 3 +- > drivers/spi/spi-sprd.c | 11 ++- > drivers/spi/spi-tegra114.c | 39 +++++--- > drivers/spi/spi-tegra20-sflash.c | 2 +- > drivers/spi/spi-topcliff-pch.c | 7 +- > drivers/spi/spi-txx9.c | 3 +- > drivers/spi/spi-xcomm.c | 3 +- > drivers/spi/spi.c | 162 +++++++++++++++++++++++++------ > drivers/spi/spidev.c | 6 +- > include/linux/spi/spi.h | 65 ++++++++++--- > 24 files changed, 293 insertions(+), 131 deletions(-) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel