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73aaf15849
linux/drivers/spi
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Paulo Zaneti 73aaf15849 spi: fsl-espi: fix support for all available clock rates 
According to NXP ESPI datasheet, the SPI clock rate is:

    spi_clk = System_Clock / ( 2 * DIV16 * ( 1 + PM ) )

Where System_Clock is the platform clock divided by 2,
DIV16 may be 1 or 16, and PM is a 4 bits integer (0 to 15).

Isolating PM on the expression, we get:

    PM = (System_Clock / ( 2 * DIV16 * spi_clk ) ) - 1

Where System_Clock = mpc8xxx_spi->spibrg / 2, spi_clk = hz,
and DIV16 = 1 or DIV16 = 16. So,

    PM = (mpc8xxx_spi->spibrg / ( 4 * hz) ) - 1
or
    PM = (mpc8xxx_spi->spibrg / ( 16 * 4 * hz) ) - 1

Current spi-fsl-espi driver can't configure the HW for all
supported clock rates. It filters out clock rates for PM = 0
and PM = 1.

This patch allows all range of supported clock rates to be
configured on the ESPI controller.

Signed-off-by: Paulo Zaneti <paulo.zaneti@datacom.ind.br>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-29 12:00:19 -06:00
..
Kconfig Merge remote-tracking branches 'spi/topic/rspi', 'spi/topic/sc18is602', 'spi/topic/sh-msiof', 'spi/topic/spidev-test' and 'spi/topic/st-ssc4' into spi-next 2016-09-30 09:14:18 -07:00
Makefile Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/pic32-sqi', 'spi/topic/pxa2xx' and 'spi/topic/qup' into spi-next 2016-09-30 09:14:14 -07:00
spi-adi-v3.c
spi-altera.c
spi-ath79.c spi: ath79: simplify iomem resource mapping 2015-09-30 20:33:29 +01:00
spi-atmel.c spi: atmel: fix gpio chip-select in case of non-DT platform 2016-01-28 23:25:54 +01:00
spi-au1550.c spi: au1550: Simplify au1550_spi_setupxfer() 2015-09-16 20:54:54 +01:00
spi-axi-spi-engine.c spi: Drop duplicate code to set master->dev.parent 2016-04-26 11:56:09 +01:00
spi-bcm53xx.c spi: bcm53xx: add spi_flash_read callback for MMIO-based reads 2016-04-18 13:53:46 +01:00
spi-bcm53xx.h
spi-bcm63xx-hsspi.c spi/bcm63xx-hsspi: add support for dual spi read/write 2015-08-25 17:33:49 +01:00
spi-bcm63xx.c Merge remote-tracking branches 'spi/topic/bcm63xx', 'spi/topic/butterfly', 'spi/topic/cadence' and 'spi/topic/davinci' into spi-next 2016-01-11 16:48:30 +00:00
spi-bcm2835.c spi: bcm2835: Remove unnecessary workaround to call gpio_set_value 2016-02-15 20:43:39 +00:00
spi-bcm2835aux.c Merge remote-tracking branches 'spi/topic/acpi', 'spi/topic/axi-engine', 'spi/topic/bcm2835' and 'spi/topic/bcm2835aux' into spi-next 2016-03-11 14:28:25 +07:00
spi-bcm-qspi.c spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-bcm-qspi.h spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-bfin5xx.c spi: spi-bfin5xx: Remove deprecated create_singlethread_workqueue 2016-07-03 14:14:31 +02:00
spi-bfin-sport.c spi: spi-bfin-sport: Remove deprecated create_singlethread_workqueue 2016-07-03 14:24:31 +02:00
spi-bitbang-txrx.h spi: Fix regression in spi-bitbang-txrx.h 2015-07-29 15:01:07 +01:00
spi-bitbang.c spi: bitbang: switch to the generic implementation of transfer_one_message 2015-10-05 14:55:56 +01:00
spi-brcmstb-qspi.c spi: brcmstb-qspi: Broadcom settop platform driver 2016-09-14 18:03:32 +01:00
spi-butterfly.c spi: butterfly: use new parport device model 2015-12-02 19:38:16 +00:00
spi-cadence.c spi: cadence: mark pm functions __maybe_unused 2016-04-18 10:58:49 +01:00
spi-cavium-octeon.c spi: octeon: Split driver into Octeon specific and common parts 2016-07-24 21:54:29 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: Add missing clk_disable_unprepare() 2016-08-24 12:37:43 +01:00
spi-cavium.c spi: octeon: Split driver into Octeon specific and common parts 2016-07-24 21:54:29 +01:00
spi-cavium.h spi: octeon: Add ThunderX driver 2016-08-19 16:24:39 +01:00
spi-clps711x.c spi: clps711x: Driver refactor 2016-07-07 11:44:43 +02:00
spi-coldfire-qspi.c spi: spi-coldfire-qspi: enable RuntimePM before registering to the core 2015-10-12 17:02:08 +01:00
spi-davinci.c spi: davinci: Use dma_request_chan() for requesting DMA channel 2016-04-29 18:15:15 +01:00
spi-dln2.c spi: Drop duplicate code to set master->dev.parent 2016-04-26 11:56:09 +01:00
spi-dw-mid.c spi: dw-mid: switch to new dmaengine_terminate_* API 2016-02-05 17:41:49 +00:00
spi-dw-mmio.c spi: dw-mmio: remove message which is handled by core 2016-02-05 17:41:49 +00:00
spi-dw-pci.c spi: dw-pci: Spelling s/paltforms/platforms/g 2016-05-11 18:26:19 +01:00
spi-dw.c spi: dw: round up result of calculation for clock divider 2016-09-12 19:59:08 +01:00
spi-dw.h spi: dw: fix multiple slaves with different baudrates 2016-09-06 11:53:50 +01:00
spi-efm32.c
spi-ep93xx.c spi: spi-ep93xx: Fix the PTR_ERR() argument 2016-05-24 16:54:50 +01:00
spi-falcon.c
spi-fsl-cpm.c QE: Move QE from arch/powerpc to drivers/soc 2015-12-22 17:12:56 -06:00
spi-fsl-cpm.h
spi-fsl-dspi.c spi: spi-fsl-dspi: Drop extra spi_master_put in device remove function 2016-08-22 17:45:22 +01:00
spi-fsl-espi.c spi: fsl-espi: fix support for all available clock rates 2016-10-29 12:00:19 -06:00
spi-fsl-lib.c spi: fsl-(e)spi: simplify cleanup code 2015-08-28 18:15:18 +01:00
spi-fsl-lib.h spi: fsl-espi: Rename len in struct mpc8xxx_spi to rx_len and make it unsigned 2016-10-28 19:39:23 +01:00
spi-fsl-spi.c spi: fsl-(e)spi: Fix checking return value of devm_ioremap_resource 2015-08-30 12:14:36 +01:00
spi-fsl-spi.h
spi-gpio.c
spi-img-spfi.c spi: img-spfi: Remove spi_master_put in img_spfi_remove() 2016-07-27 19:00:16 +01:00
spi-imx.c spi: imx: fix error return code in spi_imx_probe() 2016-09-28 09:50:55 -07:00
spi-iproc-qspi.c spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-jcore.c spi: jcore: remove unnecessary platform_set_drvdata() 2016-08-09 10:40:05 +01:00
spi-lm70llp.c spi: lm70llp: remove printk 2015-12-07 20:09:09 +00:00
spi-loopback-test.c spi: loopback-test: mark rx_ranges_cmp() static 2016-09-01 20:54:54 +01:00
spi-lp8841-rtc.c spi: lp-8841: return correct error code from probe 2016-02-26 11:06:38 +09:00
spi-meson-spifc.c spi: meson: Add GXBB compatible 2016-09-12 20:11:39 +01:00
spi-mpc52xx-psc.c spi: spi-mpc52xx-psc: Remove deprecated create_singlethread_workqueue 2016-07-03 14:23:25 +02:00
spi-mpc52xx.c
spi-mpc512x-psc.c spi: mpc512x: Call mpc512x_psc_spi_transfer_setup() unconditionally 2015-09-17 12:33:31 +01:00
spi-mt65xx.c spi: mediatek: remove spi_master_put in mtk_spi_remove() 2016-07-27 19:00:16 +01:00
spi-mxs.c
spi-nuc900.c
spi-oc-tiny.c spi: oc-tiny: Use of_property_read_u32 instead of open-coding it 2015-09-16 19:16:01 +01:00
spi-omap2-mcspi.c spi: omap2-mcspi: Use the SPI framework to handle DMA mapping 2016-07-08 10:48:02 +02:00
spi-omap-100k.c spi: omap-100k: Rely on validations done by spi core 2015-09-17 12:34:20 +01:00
spi-omap-uwire.c spi: omap-uwire: Remove needless bits_per_word and speed_hz tests 2015-09-17 12:33:58 +01:00
spi-orion.c spi: orion: Fix return value check in orion_spi_probe() 2016-06-13 16:36:40 +01:00
spi-pic32-sqi.c spi: pic32-sqi: use list_move_tail and list_move 2016-08-08 11:56:40 +01:00
spi-pic32.c spi: pic32: fixup wait_for_completion_timeout return handling 2016-07-24 21:49:16 +01:00
spi-pl022.c spi: pl022: Remove obsolete struct pl022 members from kerneldoc 2016-02-17 12:08:55 +00:00
spi-ppc4xx.c spi: bitbang: Replace spinlock by mutex 2015-09-17 12:13:40 +01:00
spi-pxa2xx-dma.c spi: pxa2xx: Remove pointer to chip data from driver data 2016-09-12 20:01:27 +01:00
spi-pxa2xx-pci.c spi: pxa2xx-pci: fix ACPI-based enumeration of SPI devices 2016-08-24 12:20:03 +01:00
spi-pxa2xx.c spi: pxa2xx: Fix build error because of missing header 2016-09-29 11:00:41 -07:00
spi-pxa2xx.h spi: pxa2xx: Add support for GPIO descriptor chip selects 2016-09-26 09:11:14 -07:00
spi-qup.c Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/pic32-sqi', 'spi/topic/pxa2xx' and 'spi/topic/qup' into spi-next 2016-09-30 09:14:14 -07:00
spi-rb4xx.c
spi-rockchip.c Merge remote-tracking branches 'spi/topic/pxa2xx', 'spi/topic/rockchip', 'spi/topic/s3c64xx', 'spi/topic/sh' and 'spi/topic/sh-msiof' into spi-next 2016-07-24 22:08:25 +01:00
spi-rspi.c spi: rspi: Increase accuracy of bit rate for RZ 2016-08-08 11:56:46 +01:00
spi-s3c24xx-fiq.h
spi-s3c24xx-fiq.S
spi-s3c24xx.c spi: bitbang: Replace spinlock by mutex 2015-09-17 12:13:40 +01:00
spi-s3c64xx.c spi: s3c64xx: restore removed comments 2016-07-14 17:28:32 +01:00
spi-sc18is602.c spi: sc18is602: Change gpiod_set_value to gpiod_set_value_cansleep 2016-09-29 11:01:36 -07:00
spi-sh-hspi.c
spi-sh-msiof.c spi: sh-msiof: Avoid invalid clock generator parameters 2016-08-05 11:46:07 +01:00
spi-sh-sci.c
spi-sh.c spi: spi-sh: Remove deprecated create_singlethread_workqueue 2016-07-11 19:32:38 +01:00
spi-sirf.c
spi-st-ssc4.c spi: st-ssc4: Fix misuse of devm_gpio_request/devm_gpio_free APIs 2016-09-14 16:05:35 +01:00
spi-sun4i.c Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi', 'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next 2016-07-24 22:08:27 +01:00
spi-sun6i.c Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi', 'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next 2016-07-24 22:08:27 +01:00
spi-tegra20-sflash.c
spi-tegra20-slink.c
spi-tegra114.c
spi-test.h spi: loopback: added additional non-power of 2 transfer lengthes 2015-12-13 20:10:15 +00:00
spi-ti-qspi.c spi: spi-ti-qspi: Add DMA support for QSPI mmap read 2016-08-17 12:24:28 +01:00
spi-tle62x0.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
spi-topcliff-pch.c spi: spi-topcliff-pch: Remove deprecated create_singlethread_workqueue 2016-07-11 19:32:26 +01:00
spi-txx9.c spi: spi-txx9: Add missing clock (un)prepare calls for CCF 2016-08-18 19:10:39 +01:00
spi-xcomm.c spi: xcomm: Export I2C module alias information 2015-07-31 18:14:57 +01:00
spi-xilinx.c spi: xilinx: Return IRQ_NONE if no interrupts were detected 2016-07-15 11:45:00 +01:00
spi-xlp.c spi: xlp: Add ACPI support for Vulcan SPI controller 2016-08-09 15:25:43 +01:00
spi-xtensa-xtfpga.c spi: xtensa-xtfpga: fix register endianness 2015-09-22 09:30:10 -07:00
spi-zynqmp-gqspi.c spi: zynqmp: disable clocks in error paths 2016-05-04 14:21:03 +01:00
spi.c kthread: kthread worker API cleanup 2016-10-11 15:06:33 -07:00
spidev.c spi: spidev: Add ACPI probing support 2016-07-04 16:28:52 +02:00