Hi, On Mon, Jul 28, 2014 at 08:57:15PM +0530, Punnaiah Choudary Kalluri wrote: > Add pl353 static memory controller devicetree binding information. > > Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xxxxxxxxxx> > --- > Changes in v4: > - none > Changes in v3: > - none > Changes in v2: > - modified timing binding info as per onfi timing parameters ^^^ There were other comments here: http://lists.infradead.org/pipermail/linux-mtd/2014-April/053488.html You don't need or want these timing parameters at all, I don't think. > - add suffix nano second as timing unit > - modified the clock names as per the IP spec > --- > .../bindings/memory-controllers/pl353-smc.txt | 53 ++++++++++++++++++++ > 1 files changed, 53 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt > > diff --git a/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt b/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt > new file mode 100644 > index 0000000..c1f011d > --- /dev/null > +++ b/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt > @@ -0,0 +1,53 @@ > +Device tree bindings for ARM PL353 static memory controller > + > +PL353 static memory controller supports two kinds of memory > +interfaces.i.e NAND and SRAM/NOR interfaces. > +The actual devices are instantiated from the child nodes of pl353 smc node. > + > +Required properties: > +- compatible : Should be "arm,pl353-smc-r2p1" > +- reg : Controller registers map and length. > +- clock-names : List of input clock names - "memclk", "aclk" > + (See clock bindings for details). > +- clocks : Clock phandles (see clock bindings for details). > +- address-cells : Address cells, must be 1. > +- size-cells : Size cells. Must be 1. > + > +Child nodes: > + For NAND the "arm,pl353-nand-r2p1" and for NOR the "cfi-flash" drivers are > +supported as child nodes. > + > +Mandatory timing properties for child nodes: > +- nand-tRC-ns : Read cycle time. > +- nand-tWC-ns : Write cycle time. > +- nand-tREA-ns : re_n assertion delay. > +- nand-tWP-ns : we_n de-assertion delay. > +- nand-tCLR-ns : Status read time > +- nand-tAR-ns : ID read time > +- nand-tRR-ns : busy to re_n These properties should probably be dropped. Look in l2-mtd.git, where we now have drivers/mtd/nand/nand_timings.c to define the ONFI timing modes, which can be auto-detected (look at struct nand_onfi_params::async_timing_mode). Boris also has pending patches for non-ONFI chips. > +for nand partition information please refer the below file > +Documentation/devicetree/bindings/mtd/partition.txt > + > +Example: > + pl353smcc_0: pl353smcc@e000e000 { > + compatible = "arm,pl353-smcc-r2p1" > + clock-names = "memclk", "aclk"; > + clocks = <&clkc 11>, <&clkc 44>; > + reg = <0xe000e000 0x1000>; > + #address-cells = <1>; > + #size-cells = <1>; > + ranges; > + nand_0: nand@e1000000 { > + compatible = "arm,pl353-nand-r2p1" > + reg = <0xe1000000 0x1000000>; > + nand-tRC-ns = <40>; > + nand-tWC-ns = <40>; > + nand-tREA-ns = <10>; > + nand-tWP-ns = <20>; > + nand-tCLR-ns = <20>; > + nand-tAR-ns = <20>; > + nand-tRR-ns = <40>; > + (...) > + }; > + }; Brian -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
