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7d93aecdb5
linux/drivers/spi
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Geert Uytterhoeven 7d93aecdb5
spi: Add generic support for unused native cs with cs-gpios 
Some SPI master controllers always drive a native chip select when
performing a transfer.  Hence when using both native and GPIO chip
selects, at least one native chip select must be left unused, to be
driven when performing transfers with slave devices using GPIO chip
selects.

Currently, to find an unused native chip select, SPI controller drivers
need to parse and process cs-gpios theirselves.  This is not only
duplicated in each driver that needs it, but also duplicates part of the
work done later at SPI controller registration time.  Note that this
cannot be done after spi_register_controller() returns, as at that time,
slave devices may have been probed already.

Hence add generic support to the SPI subsystem for finding an unused
native chip select.  Optionally, this unused native chip select, and all
other in-use native chip selects, can be validated against the maximum
number of native chip selects available on the controller hardware.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200102133822.29346-2-geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-01-07 22:32:25 +00:00
..
atmel-quadspi.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
internals.h spi: Add an helper to flush the message queue 2018-04-23 15:48:18 +01:00
Kconfig spi: Fix Kconfig indentation 2019-11-20 17:11:50 +00:00
Makefile ARM: SoC driver updates for v5.4 2019-09-16 15:52:38 -07:00
spi-altera.c spi: altera: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:14:50 +01:00
spi-armada-3700.c spi: a3700: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:15:09 +01:00
spi-at91-usart.c spi: at91-usart: Use dma_request_chan() directly for channel request 2019-11-15 12:13:02 +00:00
spi-ath79.c spi: ath79: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:15:29 +01:00
spi-atmel.c spi: atmel: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:56:07 +00:00
spi-au1550.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-axi-spi-engine.c spi: spi-axi: extend support for the delay field 2019-10-15 11:47:26 +01:00
spi-bcm63xx-hsspi.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-bcm63xx.c spi: bcm63xx: extend error condition to delay as well 2019-10-15 11:47:06 +01:00
spi-bcm2835.c spi: bcm2835: no dev_err() on clk_get() -EPROBE_DEFER 2019-12-17 12:37:34 +00:00
spi-bcm2835aux.c spi: bcm2835aux: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:16:08 +01:00
spi-bcm-qspi.c spi: bcm-qspi: Use platform_get_irq_byname_optional() to avoid error message 2020-01-07 22:32:04 +00:00
spi-bcm-qspi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459 2019-06-19 17:09:09 +02:00
spi-bitbang-txrx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spi-bitbang.c spi: bitbang: Make chipselect callback optional 2019-12-09 18:46:34 +00:00
spi-brcmstb-qspi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459 2019-06-19 17:09:09 +02:00
spi-butterfly.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-cadence.c spi: cadence: Correct handling of native chipselect 2019-11-27 12:54:45 +00:00
spi-cavium-octeon.c spi: octeon: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:27 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: Add missing pci_release_regions() 2019-12-09 18:44:19 +00:00
spi-cavium.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-cavium.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spi-clps711x.c spi: clps711x: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:36 +01:00
spi-coldfire-qspi.c spi: coldfire-qspi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:56 +01:00
spi-davinci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-dln2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 372 2019-06-05 17:37:10 +02:00
spi-dw-mid.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
spi-dw-mmio.c Merge branch 'spi-5.5' into spi-next 2019-11-22 19:56:35 +00:00
spi-dw-pci.c spi: dw-pci: Fix Chip Select amount on Intel Elkhart Lake PSE SPI 2019-10-22 17:57:43 +01:00
spi-dw.c Merge branch 'for-5.5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.6 2019-12-25 18:18:54 +00:00
spi-dw.h spi: dw: Drop GPIO header 2019-10-30 14:14:50 +00:00
spi-efm32.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-ep93xx.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-falcon.c spi: spi-falcon: extend warning to delay as well 2019-10-15 11:46:57 +01:00
spi-fsl-cpm.c spi: fsl-cpm: Correct the free:ing 2019-11-15 12:12:15 +00:00
spi-fsl-cpm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-fsl-dspi.c spi: spi-fsl-dspi: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:46 +00:00
spi-fsl-espi.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-fsl-lib.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-fsl-lib.h spi: fsl: Convert to use CS GPIO descriptors 2019-08-28 14:10:41 +01:00
spi-fsl-lpspi.c spi: fsl-lpspi: use true,false for bool variable 2019-12-25 18:17:09 +00:00
spi-fsl-qspi.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-fsl-spi.c spi: fsl: use platform_get_irq() instead of of_irq_to_resource() 2019-12-16 11:54:55 +00:00
spi-fsl-spi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-geni-qcom.c spi: spi-geni-qcom: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:18:25 +01:00
spi-gpio.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-img-spfi.c spi: img-spfi: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:06 +00:00
spi-imx.c spi: imx: use true,false for bool variable 2019-12-25 18:17:25 +00:00
spi-iproc-qspi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
spi-jcore.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
spi-lantiq-ssc.c spi: lantiq-ssc: Use devm_platform_ioremap_resource() in lantiq_ssc_probe() 2019-10-01 12:34:18 +01:00
spi-lm70llp.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-loopback-test.c spi: spi-loopback-test: use new delay field 2019-10-15 11:45:19 +01:00
spi-lp8841-rtc.c spi: lp-8841: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:18:35 +01:00
spi-mem.c spi: spi-mem: fallback to using transfers when CS gpios are used 2019-11-07 13:11:18 +00:00
spi-meson-spicc.c spi: meson-spicc: Use GPIO descriptors 2019-12-16 11:58:48 +00:00
spi-meson-spifc.c spi: spi-meson-spifc: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:19:14 +01:00
spi-mpc52xx-psc.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mpc52xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
spi-mpc512x-psc.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mt65xx.c spi: mediatek: add SPI_CS_HIGH support 2019-11-18 17:47:00 +00:00
spi-mt7621.c spi: mt7621: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:19:34 +01:00
spi-mxic.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-mxs.c spi: mxs: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:26 +00:00
spi-npcm-fiu.c spi: npcm-fiu: remove set but not used variable 'retlen' 2019-09-05 18:19:45 +01:00
spi-npcm-pspi.c spi: npcm: Remove set but not used variable 'val' 2019-10-09 18:20:16 +01:00
spi-nxp-fspi.c spi: nxp-fspi: Ensure width is respected in spi-mem operations 2019-12-16 11:54:34 +00:00
spi-oc-tiny.c spi: oc-tiny: Use GPIO descriptors 2019-12-27 01:08:11 +00:00
spi-omap2-mcspi.c spi: omap2-mcspi: Remove redundant checks 2019-11-11 12:50:26 +00:00
spi-omap-100k.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-omap-uwire.c
spi-orion.c spi: orion: use new word_delay field for SPI transfers 2019-10-15 11:43:31 +01:00
spi-pic32-sqi.c spi: pic32-sqi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:20:52 +01:00
spi-pic32.c spi: pic32: Retire dma_request_slave_channel_compat() 2019-11-22 19:53:41 +00:00
spi-pl022.c spi: pl022: Use dma_request_chan() directly for channel request 2019-11-15 12:14:19 +00:00
spi-ppc4xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-pxa2xx-dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-pxa2xx-pci.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
spi-pxa2xx.c Merge branch 'for-5.5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.6 2019-12-25 18:18:54 +00:00
spi-pxa2xx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-qcom-qspi.c spi: spi-qcom-qspi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:21:12 +01:00
spi-qup.c spi: qup: Use dma_request_chan() directly for channel request 2019-11-15 12:14:29 +00:00
spi-rb4xx.c spi: rb4xx: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:21:21 +01:00
spi-rockchip.c Linux 5.2-rc4 2019-06-10 18:52:53 +01:00
spi-rspi.c spi: rspi: Remove obsolete platform_device_id entries 2019-12-11 16:50:06 +00:00
spi-s3c24xx-fiq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-s3c24xx-fiq.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-s3c24xx.c spi: s3c24xx: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:21:31 +01:00
spi-s3c64xx.c spi: s3c64xx: Use dma_request_chan() directly for channel request 2019-11-15 12:14:39 +00:00
spi-sc18is602.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-sh-hspi.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-sh-msiof.c spi: sh-msiof: Use devm_platform_ioremap_resource() helper 2019-08-07 14:24:47 +01:00
spi-sh-sci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-sh.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-sifive.c spi: sifive: disable clk when probe fails and remove 2019-11-04 13:26:11 +00:00
spi-sirf.c spi: sirf: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:36 +00:00
spi-slave-mt27xx.c spi: mediatek: Use devm_platform_ioremap_resource() in mtk_spi_slave_probe() 2019-10-01 12:34:58 +01:00
spi-slave-system-control.c spi: slave: Fix missing break in switch 2018-10-03 16:23:10 +01:00
spi-slave-time.c spi: slave: Add SPI slave handler reporting uptime at previous message 2017-05-26 13:12:04 +01:00
spi-sprd-adi.c spi: sprd: adi: Set BIT_WDG_NEW bit when rebooting 2019-10-28 13:17:10 +00:00
spi-sprd.c spi: sprd: Fix the incorrect SPI register 2019-12-04 12:14:13 +00:00
spi-st-ssc4.c spi: st-ssc4: add missed pm_runtime_disable 2019-11-18 12:59:11 +00:00
spi-stm32-qspi.c spi: stm32-qspi: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:58:08 +00:00
spi-stm32.c spi: stm32: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:58:28 +00:00
spi-sun4i.c spi: sun4i: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:22:29 +01:00
spi-sun6i.c spi: sun6i: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:22:49 +01:00
spi-synquacer.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-tegra20-sflash.c spi: tegra20-sflash: use to new spi_transfer_delay_exec 2019-10-15 11:45:07 +01:00
spi-tegra20-slink.c spi: tegra20-slink: add missed clk_unprepare 2019-11-15 12:15:22 +00:00
spi-tegra114.c spi: tegra114: use true,false for bool variable 2019-12-25 18:17:42 +00:00
spi-test.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-ti-qspi.c Merge branch 'for-5.5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.6 2019-12-25 18:18:54 +00:00
spi-tle62x0.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-topcliff-pch.c spi/topcliff-pch: Remove unneeded semicolon 2019-12-09 18:45:53 +00:00
spi-txx9.c spi: txx9: Convert to use GPIO descriptors 2019-10-30 14:14:32 +00:00
spi-uniphier.c spi: uniphier: Add DMA transfer mode support 2019-12-25 18:21:05 +00:00
spi-xcomm.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-xilinx.c spi: xilinx: Add DT support for selecting transfer word width 2019-10-24 12:45:21 +01:00
spi-xlp.c spi: xlp: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:23:28 +01:00
spi-xtensa-xtfpga.c spi: xtensa-xtfpga: Use devm_platform_ioremap_resource() in xtfpga_spi_probe() 2019-10-01 12:35:18 +01:00
spi-zynq-qspi.c spi: zynq-qspi: Support two chip selects 2019-11-08 17:45:09 +00:00
spi-zynqmp-gqspi.c spi: zynqmp: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:23:48 +01:00
spi.c spi: Add generic support for unused native cs with cs-gpios 2020-01-07 22:32:25 +00:00
spidev.c spi: spidev: use new delay field for spi transfers 2019-10-15 11:45:29 +01:00