From cdc9dd0750bcff780d54050512206fcf2ad05489 Mon Sep 17 00:00:00 2001 From: Jagan Teki Date: Sat, 27 Jun 2015 00:51:34 +0530 Subject: [PATCH] spi: zynq_spi: Add fdt support in driver Now zynq spi driver platform data is controlled by devicetree, enable the status by saying "okay" on respective board dts to use the devicetree generated platdata. Ex: &spi1 { status = "okay"; }; Signed-off-by: Jagan Teki Acked-by: Simon Glass Cc: Michal Simek Cc: Siva Durga Prasad Paladugu Tested-by: Jagan Teki --- arch/arm/dts/zynq-7000.dtsi | 2 ++ doc/device-tree-bindings/spi/spi-zynq.txt | 2 ++ drivers/spi/zynq_spi.c | 23 +++++++++++++---------- 3 files changed, 17 insertions(+), 10 deletions(-) diff --git a/arch/arm/dts/zynq-7000.dtsi b/arch/arm/dts/zynq-7000.dtsi index f66f8dcaf8..920715989e 100644 --- a/arch/arm/dts/zynq-7000.dtsi +++ b/arch/arm/dts/zynq-7000.dtsi @@ -117,6 +117,7 @@ interrupts = <0 26 4>; clocks = <&clkc 25>, <&clkc 34>; clock-names = "ref_clk", "pclk"; + spi-max-frequency = <166666700>; #address-cells = <1>; #size-cells = <0>; }; @@ -129,6 +130,7 @@ interrupts = <0 49 4>; clocks = <&clkc 26>, <&clkc 35>; clock-names = "ref_clk", "pclk"; + spi-max-frequency = <166666700>; #address-cells = <1>; #size-cells = <0>; }; diff --git a/doc/device-tree-bindings/spi/spi-zynq.txt b/doc/device-tree-bindings/spi/spi-zynq.txt index a7c275717b..f397a36d68 100644 --- a/doc/device-tree-bindings/spi/spi-zynq.txt +++ b/doc/device-tree-bindings/spi/spi-zynq.txt @@ -11,6 +11,7 @@ Required properties: - clocks : Clock phandles (see clock bindings for details). - clock-names : List of input clock names - "ref_clk", "pclk" (See clock bindings for details). +- spi-max-frequency : Maximum SPI clocking speed of device in Hz Example: @@ -22,6 +23,7 @@ Example: interrupts = <0 26 4>; clocks = <&clkc 25>, <&clkc 34>; clock-names = "ref_clk", "pclk"; + spi-max-frequency = <166666700>; #address-cells = <1>; #size-cells = <0>; } ; diff --git a/drivers/spi/zynq_spi.c b/drivers/spi/zynq_spi.c index 50fb1aa479..c5c3e1044f 100644 --- a/drivers/spi/zynq_spi.c +++ b/drivers/spi/zynq_spi.c @@ -13,9 +13,12 @@ #include #include #include +#include #include #include +DECLARE_GLOBAL_DATA_PTR; + /* zynq spi register bit masks ZYNQ_SPI___MASK */ #define ZYNQ_SPI_CR_MSA_MASK (1 << 15) /* Manual start enb */ #define ZYNQ_SPI_CR_MCS_MASK (1 << 14) /* Manual chip select */ @@ -63,22 +66,22 @@ struct zynq_spi_priv { u32 freq; /* required frequency */ }; -static inline struct zynq_spi_regs *get_zynq_spi_regs(struct udevice *bus) -{ - if (bus->seq) - return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR1; - else - return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR0; -} - static int zynq_spi_ofdata_to_platdata(struct udevice *bus) { struct zynq_spi_platdata *plat = bus->platdata; + const void *blob = gd->fdt_blob; + int node = bus->of_offset; + + plat->regs = (struct zynq_spi_regs *)fdtdec_get_addr(blob, node, "reg"); - plat->regs = get_zynq_spi_regs(bus); - plat->frequency = 166666700; + /* FIXME: Use 250MHz as a suitable default */ + plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency", + 250000000); plat->speed_hz = plat->frequency / 2; + debug("zynq_spi_ofdata_to_platdata: regs=%p max-frequency=%d\n", + plat->regs, plat->frequency); + return 0; } -- 2.39.5