On 05.11.2012 12:03, Philip, Avinash wrote:
> On Fri, Nov 02, 2012 at 20:55:56, Daniel Mack wrote:
>> This patch adds basic DT bindings for OMAP GPMC.
>>
>> The actual peripherals are instanciated from child nodes within the GPMC
>> node, and the only type of device that is currently supported is NAND.
>>
>> Code was added to parse the generic GPMC timing parameters and some
>> documentation with examples on how to use them.
>>
>> Successfully tested on an AM33xx board.
>>
>> Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
> [...]
>> +
>> + nand@0,0 {
>> + reg = <0 0 0>; /* CS0, offset 0 */
>> + nand-bus-width = <16>;
>> + nand-ecc-mode = "none";
>> +
>> + gpmc,sync-clk = <0>;
>> + gpmc,cs-on = <0>;
>> + gpmc,cs-rd-off = <36>;
>> + gpmc,cs-wr-off = <36>;
>> + gpmc,adv-on = <6>;
>> + gpmc,adv-rd-off = <24>;
>> + gpmc,adv-wr-off = <36>;
>> + gpmc,we-off = <30>;
>> + gpmc,oe-off = <48>;
>> + gpmc,access = <54>;
>> + gpmc,rd-cycle = <72>;
>> + gpmc,wr-cycle = <72>;
>> + gpmc,wr-access = <30>;
>> + gpmc,wr-data-mux-bus = <0>;
>> +
>> + #address-cells = <1>;
>> + #size-cells = <1>;
>> +
>
> Can you take the timings (for example) from arago tree. The timings is tested in am335x-evm
> So the timings can be directly used to populate GPMC timings. Timings can found at
>
> http://arago-project.org/git/projects/?p=linux-am33x.git;a=commitdiff;
> h=66bfbd2c5b35dc81edce0c24843c476161ab5978;hp=370630359cb8db711cf0941cd2a242e28ccfb61e
>
> [...]
>> +static int gpmc_probe_dt(struct platform_device *pdev)
>
> Can you take care of the following section mismatch.
> WARNING: vmlinux.o(.text+0x1e2d0): Section mismatch in reference
> from the function gpmc_probe_dt() to the function .init.text:gpmc_nand_init().
Sore, both fixed for v4.
> [...]
>> +
>> + val = of_get_nand_ecc_mode(child);
>> + if (val >= 0)
>> + gpmc_nand_data->ecc_opt = val;
>
> This will fail for BCH. Index of "soft_bch" is 5 & also don't have selection
> option between for BCH4 & BCH8 also.
> Can you use the of_property_read_u32 (as done early) to pass the ecc selection
> from dt file. This will help selection of BCH4 & BCH8 ecc options.
Hmm. Shouldn't we rather teach of_get_nand_ecc_mode() that two modes and
bring the enum in sync?
Daniel
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