From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Mark Brown <broonie@kernel.org>
Cc: Chris Brandt <chris.brandt@renesas.com>,
linux-spi@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
linux-sh@vger.kernel.org,
Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH 8/8] spi: rspi: Fill in controller speed limits
Date: Mon, 8 Jun 2020 11:59:40 +0200 [thread overview]
Message-ID: <20200608095940.30516-9-geert+renesas@glider.be> (raw)
In-Reply-To: <20200608095940.30516-1-geert+renesas@glider.be>
Fill in the controller speed limits, so the SPI core can use them for
validating SPI transfers, and adjusting them where needed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/spi/spi-rspi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 2b5334e22ae421b5..e39fd38f5180efb3 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -243,6 +243,8 @@ struct spi_ops {
int (*transfer_one)(struct spi_controller *ctlr,
struct spi_device *spi, struct spi_transfer *xfer);
u16 extra_mode_bits;
+ u16 min_div;
+ u16 max_div;
u16 flags;
u16 fifo_size;
u8 num_hw_ss;
@@ -1181,6 +1183,8 @@ static int rspi_remove(struct platform_device *pdev)
static const struct spi_ops rspi_ops = {
.set_config_register = rspi_set_config_register,
.transfer_one = rspi_transfer_one,
+ .min_div = 2,
+ .max_div = 4096,
.flags = SPI_CONTROLLER_MUST_TX,
.fifo_size = 8,
.num_hw_ss = 2,
@@ -1189,6 +1193,8 @@ static const struct spi_ops rspi_ops = {
static const struct spi_ops rspi_rz_ops = {
.set_config_register = rspi_rz_set_config_register,
.transfer_one = rspi_rz_transfer_one,
+ .min_div = 2,
+ .max_div = 4096,
.flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
.fifo_size = 8, /* 8 for TX, 32 for RX */
.num_hw_ss = 1,
@@ -1199,6 +1205,8 @@ static const struct spi_ops qspi_ops = {
.transfer_one = qspi_transfer_one,
.extra_mode_bits = SPI_TX_DUAL | SPI_TX_QUAD |
SPI_RX_DUAL | SPI_RX_QUAD,
+ .min_div = 1,
+ .max_div = 4080,
.flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
.fifo_size = 32,
.num_hw_ss = 1,
@@ -1260,6 +1268,7 @@ static int rspi_probe(struct platform_device *pdev)
int ret;
const struct rspi_plat_data *rspi_pd;
const struct spi_ops *ops;
+ unsigned long clksrc;
ctlr = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
if (ctlr == NULL)
@@ -1312,6 +1321,9 @@ static int rspi_probe(struct platform_device *pdev)
ctlr->unprepare_message = rspi_unprepare_message;
ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST |
SPI_LOOP | ops->extra_mode_bits;
+ clksrc = clk_get_rate(rspi->clk);
+ ctlr->min_speed_hz = DIV_ROUND_UP(clksrc, ops->max_div);
+ ctlr->max_speed_hz = DIV_ROUND_UP(clksrc, ops->min_div);
ctlr->flags = ops->flags;
ctlr->dev.of_node = pdev->dev.of_node;
ctlr->use_gpio_descriptors = true;
--
2.17.1
next prev parent reply other threads:[~2020-06-08 9:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 9:59 [PATCH 0/8] spi: rspi: Bit rate improvements Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 1/8] spi: rspi: Remove useless .set_config_register() check Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 2/8] spi: rspi: Use requested instead of maximum bit rate Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 3/8] spi: rspi: Clean up Bit Rate Division Setting handling Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 4/8] spi: rspi: Increase bit rate accuracy on RZ/A Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 5/8] spi: rspi: Increase bit rate range for RSPI on SH Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 6/8] spi: rspi: Increase bit rate range for QSPI Geert Uytterhoeven
2020-06-08 9:59 ` [PATCH 7/8] spi: rspi: Fill in spi_transfer.effective_speed_hz Geert Uytterhoeven
2020-06-08 9:59 ` Geert Uytterhoeven [this message]
2020-06-09 12:54 ` [PATCH 0/8] spi: rspi: Bit rate improvements Mark Brown
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