diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 25003c4..f65384b 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -179,6 +179,7 @@ struct rockchip_spi { u8 tmode; u8 bpw; u8 n_bytes; + u8 rsd_nsecs; unsigned len; u32 speed; @@ -499,6 +500,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs) { u32 div = 0; u32 dmacr = 0; + int rsd = 0; u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET) | (CR0_SSD_ONE << CR0_SSD_OFFSET); @@ -528,6 +530,20 @@ static void rockchip_spi_config(struct rockchip_spi *rs) div = max_t(u32, rs->max_freq / rs->speed, 1); div = (div + 1) & 0xfffe; + /* Rx sample delay is expressed in parent clock cycles (max 3) */ + rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->max_freq >> 8), + 1000000000 >> 8); + if (!rsd && rs->rsd_nsecs) { + pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n", + rs->max_freq, rs->rsd_nsecs); + } else if (rsd > 3) { + rsd = 3; + pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n", + rs->max_freq, rs->rsd_nsecs, + rsd * 1000000000U / rs->max_freq); + } + cr0 |= rsd << CR0_RSD_OFFSET; + writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1); @@ -620,6 +636,7 @@ static int rockchip_spi_probe(struct platform_device *pdev) struct rockchip_spi *rs; struct spi_master *master; struct resource *mem; + u32 rsd_nsecs; master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi)); if (!master) @@ -671,6 +688,10 @@ static int rockchip_spi_probe(struct platform_device *pdev) rs->dev = &pdev->dev; rs->max_freq = clk_get_rate(rs->spiclk); + if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns", + &rsd_nsecs)) + rs->rsd_nsecs = rsd_nsecs; + rs->fifo_len = get_fifo_len(rs); if (!rs->fifo_len) { dev_err(&pdev->dev, "Failed to get fifo length\n"); |
