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Fri, 13 Sep 2019 01:46:04 -0700 Received: from saturn.ad.analog.com (10.48.65.123) by NWD2HUBCAS7.ad.analog.com (10.64.69.107) with Microsoft SMTP Server id 14.3.408.0; Fri, 13 Sep 2019 04:46:09 -0400 From: Alexandru Ardelean To: , , , , , CC: , , , , , , , Alexandru Ardelean Subject: [RFC PATCH 00/15] Unify SPI delays into an `struct spi_delay` Date: Fri, 13 Sep 2019 14:45:35 +0300 Message-ID: <20190913114550.956-1-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.57;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(376002)(39860400002)(346002)(136003)(396003)(199004)(189003)(7636002)(305945005)(47776003)(2870700001)(8936002)(246002)(8676002)(50226002)(36756003)(110136005)(54906003)(106002)(316002)(1076003)(2201001)(7696005)(2906002)(7416002)(126002)(186003)(486006)(26005)(48376002)(356004)(6666004)(336012)(86362001)(70586007)(70206006)(478600001)(107886003)(50466002)(5660300002)(476003)(426003)(4326008)(44832011)(51416003)(2616005)(81973001)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:BN3PR03MB2132;H:nwd2mta2.analog.com;FPR:;SPF:Pass;LANG:en;PTR:nwd2mail11.analog.com;A:1;MX:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 901dcf5f-d346-4d63-c43b-08d73826d370 X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600166)(711020)(4605104)(4709080)(1401327)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328);SRVR:BN3PR03MB2132; X-MS-TrafficTypeDiagnostic: BN3PR03MB2132: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-Forefront-PRVS: 0159AC2B97 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Message-Info: SFVSMC4UrNJzauz+dLNerpdHZGwmVHqO1j0r5bxb8rVT5U1OvO0DC/i0Q7868lsrzaNHREDnsfeJc+hqjH80cka+XG1a13ankJulk8MswiLGWdFej4FCLuAzAsD1UjcJDmN4a8/fNT8KtSiqo7hoh+q4zKQakCDqIh4jc2T0HoqQabZ3RDE37wIXG4TT0oWjGVUjC46cs2n6qo3K5999ocisSsIjfWJOMuyLqb6Hj7GloH9UScmFN/Yr4pv0XVlJSLHgEIvLaJ6/HMdvleXHez7T5c4x1UmIpEjUbLBQ3BGOPiHfMGl4388cbavfZ5z0y6oQDb1tw8pfrPG/DEQbEcn75bg0pxAyGY1YL/sMakzC3GY9J2mt4g0gKjcEXU0rJGkiussQIXJfnDQNNN7GQdY0I7L2UQC2wNt9m1SjP8E= X-OriginatorOrg: analog.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Sep 2019 08:46:10.1428 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 901dcf5f-d346-4d63-c43b-08d73826d370 X-MS-Exchange-CrossTenant-Id: eaa689b4-8f87-40e0-9c6f-7228de4d754a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=eaa689b4-8f87-40e0-9c6f-7228de4d754a;Ip=[137.71.25.57];Helo=[nwd2mta2.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR03MB2132 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.70,1.0.8 definitions=2019-09-13_05:2019-09-11,2019-09-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1011 malwarescore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 phishscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1909130083 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. 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(-) -- 2.20.1