Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
1 SAMSUNG Exynos SoCs SROM Controller driver. 2 3 Required properties: 4 - compatible : Should contain "samsung,exynos4210-srom". 5 6 - reg: offset and length of the register set 7 8 Optional properties: 9 The SROM controller can be used to attach external peripherals. In this case 10 extra properties, describing the bus behind it, should be specified as below: 11 12 - #address-cells: Must be set to 2 to allow device address translation. 13 Address is specified as (bank#, offset). 14 15 - #size-cells: Must be set to 1 to allow device size passing 16 17 - ranges: Must be set up to reflect the memory layout with four integer values 18 per bank: 19 <bank-number> 0 <parent address of bank> <size> 20 21 Sub-nodes: 22 The actual device nodes should be added as subnodes to the SROMc node. These 23 subnodes, in addition to regular device specification, should contain the following 24 properties, describing configuration of the relevant SROM bank: 25 26 Required properties: 27 - reg: bank number, base address (relative to start of the bank) and size of 28 the memory mapped for the device. Note that base address will be 29 typically 0 as this is the start of the bank. 30 31 - samsung,srom-timing : array of 6 integers, specifying bank timings in the 32 following order: Tacp, Tcah, Tcoh, Tacc, Tcos, Tacs. 33 Each value is specified in cycles and has the following 34 meaning and valid range: 35 Tacp : Page mode access cycle at Page mode (0 - 15) 36 Tcah : Address holding time after CSn (0 - 15) 37 Tcoh : Chip selection hold on OEn (0 - 15) 38 Tacc : Access cycle (0 - 31, the actual time is N + 1) 39 Tcos : Chip selection set-up before OEn (0 - 15) 40 Tacs : Address set-up before CSn (0 - 15) 41 42 Optional properties: 43 - reg-io-width : data width in bytes (1 or 2). If omitted, default of 1 is used. 44 45 - samsung,srom-page-mode : if page mode is set, 4 data page mode will be configured, 46 else normal (1 data) page mode will be set. 47 48 Example: basic definition, no banks are configured 49 memory-controller@12570000 { 50 compatible = "samsung,exynos4210-srom"; 51 reg = <0x12570000 0x14>; 52 }; 53 54 Example: SROMc with SMSC911x ethernet chip on bank 3 55 memory-controller@12570000 { 56 #address-cells = <2>; 57 #size-cells = <1>; 58 ranges = <0 0 0x04000000 0x20000 // Bank0 59 1 0 0x05000000 0x20000 // Bank1 60 2 0 0x06000000 0x20000 // Bank2 61 3 0 0x07000000 0x20000>; // Bank3 62 63 compatible = "samsung,exynos4210-srom"; 64 reg = <0x12570000 0x14>; 65 66 ethernet@3,0 { 67 compatible = "smsc,lan9115"; 68 reg = <3 0 0x10000>; // Bank 3, offset = 0 69 phy-mode = "mii"; 70 interrupt-parent = <&gpx0>; 71 interrupts = <5 8>; 72 reg-io-width = <2>; 73 smsc,irq-push-pull; 74 smsc,force-internal-phy; 75 76 samsung,srom-page-mode; 77 samsung,srom-timing = <9 12 1 9 1 1>; 78 }; 79 };