Hi Ken, On 06/01/2015 22:30, Ken Wilson wrote: > Create a new dt binding for the Armada 375 that supports up to > 3 chip selects but uses the same prescaler values and algorithm > as the basic orion binding.
There was already a patch that have been sent for this: http://thread.gmane.org/gmane.linux.kernel.spi.devel/17808/focus=17809 but in the end it has not been merged. The last email on the thread was about doing the manipulation in set_cs and not in setup_transfer(). And I didn't find a newer version. Maybe it just fell through the cracks. Thomas did you remember of it? Gregory > > Update the Armada 370 so that it supports up to 4 chip selects. > > This has been tested on the Armada 375 with multiple SPI-NOR chips. > > Signed-off-by: Ken Wilson <[email protected]> > --- > .../devicetree/bindings/spi/spi-orion.txt | 3 ++- > arch/arm/boot/dts/armada-375.dtsi | 4 +-- > drivers/spi/spi-orion.c | 29 > +++++++++++++++++++--- > 3 files changed, 29 insertions(+), 7 deletions(-) > > diff --git a/Documentation/devicetree/bindings/spi/spi-orion.txt > b/Documentation/devicetree/bindings/spi/spi-orion.txt > index 50c3a3d..2aeeb85 100644 > --- a/Documentation/devicetree/bindings/spi/spi-orion.txt > +++ b/Documentation/devicetree/bindings/spi/spi-orion.txt > @@ -1,7 +1,8 @@ > Marvell Orion SPI device > > Required properties: > -- compatible : should be "marvell,orion-spi" or "marvell,armada-370-spi". > +- compatible : should be "marvell,orion-spi", "marvell,armada-370-spi", > + or "marvell,armada-375-spi". > - reg : offset and length of the register set for the device > - cell-index : Which of multiple SPI controllers is this. > Optional properties: > diff --git a/arch/arm/boot/dts/armada-375.dtsi > b/arch/arm/boot/dts/armada-375.dtsi > index de65714..f7a5ce2 100644 > --- a/arch/arm/boot/dts/armada-375.dtsi > +++ b/arch/arm/boot/dts/armada-375.dtsi > @@ -192,7 +192,7 @@ > }; > > spi0: spi@10600 { > - compatible = "marvell,orion-spi"; > + compatible = "marvell,armada-375-spi", > "marvell,orion-spi"; > reg = <0x10600 0x50>; > #address-cells = <1>; > #size-cells = <0>; > @@ -203,7 +203,7 @@ > }; > > spi1: spi@10680 { > - compatible = "marvell,orion-spi"; > + compatible = "marvell,armada-375-spi", > "marvell,orion-spi"; > reg = <0x10680 0x50>; > #address-cells = <1>; > #size-cells = <0>; > diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c > index c76b7d7..4129c37 100644 > --- a/drivers/spi/spi-orion.c > +++ b/drivers/spi/spi-orion.c > @@ -28,7 +28,6 @@ > /* Runtime PM autosuspend timeout: PM is fairly light on this driver */ > #define SPI_AUTOSUSPEND_TIMEOUT 200 > > -#define ORION_NUM_CHIPSELECTS 1 /* only one slave is > supported*/ > #define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */ > > #define ORION_SPI_IF_CTRL_REG 0x00 > @@ -44,6 +43,7 @@ > #define ARMADA_SPI_CLK_PRESCALE_MASK 0xDF > #define ORION_SPI_MODE_MASK (ORION_SPI_MODE_CPOL | \ > ORION_SPI_MODE_CPHA) > +#define ORION_SPI_CS_MASK 0x1C > > enum orion_spi_type { > ORION_SPI, > @@ -55,6 +55,7 @@ struct orion_spi_dev { > unsigned int min_divisor; > unsigned int max_divisor; > u32 prescale_mask; > + u8 num_cs; > }; > > struct orion_spi { > @@ -201,6 +202,13 @@ orion_spi_setup_transfer(struct spi_device *spi, struct > spi_transfer *t) > > orion_spi_mode_set(spi); > > + if (orion_spi->master->num_chipselect > 1) { > + orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, > + ORION_SPI_CS_MASK); > + orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, > + (spi->chip_select) << 2); > + } > + > rc = orion_spi_baudrate_set(spi, speed); > if (rc) > return rc; > @@ -398,18 +406,31 @@ static const struct orion_spi_dev orion_spi_dev_data = { > .min_divisor = 4, > .max_divisor = 30, > .prescale_mask = ORION_SPI_CLK_PRESCALE_MASK, > + .num_cs = 1, > }; > > -static const struct orion_spi_dev armada_spi_dev_data = { > +static const struct orion_spi_dev armada_370_spi_dev_data = { > .typ = ARMADA_SPI, > .min_divisor = 1, > .max_divisor = 1920, > .prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK, > + .num_cs = 4, > +}; > + > +static const struct orion_spi_dev armada_375_spi_dev_data = { > + .typ = ORION_SPI, > + .min_divisor = 4, > + .max_divisor = 30, > + .prescale_mask = ORION_SPI_CLK_PRESCALE_MASK, > + .num_cs = 3, > }; > > static const struct of_device_id orion_spi_of_match_table[] = { > { .compatible = "marvell,orion-spi", .data = &orion_spi_dev_data, }, > - { .compatible = "marvell,armada-370-spi", .data = &armada_spi_dev_data, > }, > + { .compatible = "marvell,armada-370-spi", > + .data = &armada_370_spi_dev_data, }, > + { .compatible = "marvell,armada-375-spi", > + .data = &armada_375_spi_dev_data, }, > {} > }; > MODULE_DEVICE_TABLE(of, orion_spi_of_match_table); > @@ -444,7 +465,6 @@ static int orion_spi_probe(struct platform_device *pdev) > master->mode_bits = SPI_CPHA | SPI_CPOL; > > master->transfer_one_message = orion_spi_transfer_one_message; > - master->num_chipselect = ORION_NUM_CHIPSELECTS; > master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); > master->auto_runtime_pm = true; > > @@ -470,6 +490,7 @@ static int orion_spi_probe(struct platform_device *pdev) > tclk_hz = clk_get_rate(spi->clk); > master->max_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->min_divisor); > master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor); > + master->num_chipselect = devdata->num_cs; > > r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > spi->base = devm_ioremap_resource(&pdev->dev, r); > -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
