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Commit e2580a4a authored by Vignesh R's avatar Vignesh R Committed by Cyrille Pitchen
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mtd: spi-nor: cadence-quadspi: Add support to enable loop-back clock circuit 



Cadence QSPI IP has a adapted loop-back circuit which can be enabled by
setting BYPASS field to 0 in READCAPTURE register. It enables use of
QSPI return clock to latch the data rather than the internal QSPI
reference clock. For high speed operations, adapted loop-back circuit
using QSPI return clock helps to increase data valid window.

Based on DT parameter cdns,rclk-en enable adapted loop-back circuit
for boards which do have QSPI return clock provided.
This patch also modifies cqspi_readdata_capture() function's bypass
parameter to bool to match how its used in the function.

Signed-off-by: default avatarVignesh R <vigneshr@ti.com>
Acked-by: default avatarMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@wedev4u.fr>
parent 00df2635

drivers/mtd/spi-nor/cadence-quadspi.c

+6 −2
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ struct cqspi_st { 
	bool			is_decoded_cs;

	u32			fifo_depth;

	u32			fifo_width;

	bool			rclk_en;

	u32			trigger_address;

	u32			wr_delay;

	struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
@@ -788,7 +789,7 @@ static void cqspi_config_baudrate_div(struct cqspi_st *cqspi) 
}



static void cqspi_readdata_capture(struct cqspi_st *cqspi,

				   const unsigned int bypass,

				   const bool bypass,

				   const unsigned int delay)

{

	void __iomem *reg_base = cqspi->iobase;
@@ -852,7 +853,8 @@ static void cqspi_configure(struct spi_nor *nor) 
		cqspi->sclk = sclk;

		cqspi_config_baudrate_div(cqspi);

		cqspi_delay(nor);

		cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay);

		cqspi_readdata_capture(cqspi, !cqspi->rclk_en,

				       f_pdata->read_delay);

	}



	if (switch_cs || switch_ck)
@@ -1049,6 +1051,8 @@ static int cqspi_of_get_pdata(struct platform_device *pdev) 
		return -ENXIO;

	}



	cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en");



	return 0;

}