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SubjectRe: [PATCH v2 3/6] spi: cadence-quadspi: Add multi-chipselect support for Intel LGM SoC
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Hi Pratyush,

On 21/10/2020 11:13 pm, Pratyush Yadav wrote:
> Hi,
>
> On 21/10/20 10:55AM, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>>
>> Add multiple chipselect support for Intel LGM SoCs,
>> currently QSPI-NOR and QSPI-NAND supported.
>>
>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
>> ---
>> drivers/spi/spi-cadence-quadspi.c | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
>> index 3d017b484114..3bf6d3697631 100644
>> --- a/drivers/spi/spi-cadence-quadspi.c
>> +++ b/drivers/spi/spi-cadence-quadspi.c
>> @@ -38,6 +38,7 @@
>>
>> /* Capabilities */
>> #define CQSPI_SUPPORTS_OCTAL BIT(0)
>> +#define CQSPI_SUPPORTS_MULTI_CHIPSELECT BIT(1)
>>
>> struct cqspi_st;
>>
>> @@ -75,6 +76,7 @@ struct cqspi_st {
>> bool is_decoded_cs;
>> u32 fifo_depth;
>> u32 fifo_width;
>> + u32 num_chipselect;
>> bool rclk_en;
>> u32 trigger_address;
>> u32 wr_delay;
>> @@ -1070,6 +1072,14 @@ static int cqspi_of_get_pdata(struct cqspi_st *cqspi)
>> return -ENXIO;
>> }
>>
>> + if (!cqspi->use_direct_mode) {
>
> Shouldn't this be guarded by CQSPI_SUPPORTS_MULTI_CHIPSELECT instead of
> cqspi->use_direct_mode?
Yes, we can use CQSPI_SUPPORTS_MULTI_CHIPSELECT instead of
cqspi->use_direct_mode
>
> Also, cqspi->use_direct_mode would always be false here because
> cqspi_of_get_pdata() is called before we set it...
Good catch, thanks!

Regards
Vadivel
>
>> + if (of_property_read_u32(np, "num-chipselect",
>> + &cqspi->num_chipselect)) {
>> + dev_err(dev, "couldn't determine number of cs\n");
>> + return -ENXIO;
>
> ... so even if someone doesn't want to use multiple chip selects they
> would have to specify this property or the probe will fail, which is the
> case on J721E EVM for example.
>
>> + }
>> + }
>> +
>> cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en");
>>
>> return 0;
>> @@ -1307,6 +1317,9 @@ static int cqspi_probe(struct platform_device *pdev)
>> cqspi->current_cs = -1;
>> cqspi->sclk = 0;
>>
>> + if (ddata->hwcaps_mask & CQSPI_SUPPORTS_MULTI_CHIPSELECT)
>> + master->num_chipselect = cqspi->num_chipselect;
>> +
>> ret = cqspi_setup_flash(cqspi);
>> if (ret) {
>> dev_err(dev, "failed to setup flash parameters %d\n", ret);
>> @@ -1396,6 +1409,7 @@ static const struct cqspi_driver_platdata am654_ospi = {
>> };
>>
>> static const struct cqspi_driver_platdata intel_lgm_qspi = {
>> + .hwcaps_mask = CQSPI_SUPPORTS_MULTI_CHIPSELECT,
>> .quirks = CQSPI_DISABLE_DAC_MODE,
>> };
>>
>> --
>> 2.11.0
>>
>

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