From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 1/8] i2c: lpi2c: determine clk rate during probe
Date: Fri, 2 Feb 2024 16:31:06 +0100 [thread overview]
Message-ID: <20240202153113.245488-2-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20240202153113.245488-1-s.hauer@pengutronix.de>
The clock rate is not expected to change during runtime, so we can
determine it during probe instead of later when actually transferring
messages. This helps us to integrate PBL support into the driver where
we don't have clk_get_rate() available.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/i2c/busses/i2c-imx-lpi2c.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index f28a445601..91203d90be 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -104,6 +104,7 @@ struct lpi2c_imx_struct {
unsigned int txfifosize;
unsigned int rxfifosize;
enum lpi2c_imx_mode mode;
+ unsigned long clk_rate;
};
static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx,
@@ -197,23 +198,19 @@ static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
{
u8 prescale, filt, sethold, datavd;
- unsigned int clk_rate, clk_cycle, clkhi, clklo;
+ unsigned int clk_cycle, clkhi, clklo;
enum lpi2c_imx_pincfg pincfg;
unsigned int temp;
lpi2c_imx_set_mode(lpi2c_imx);
- clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
- if (!clk_rate)
- return -EINVAL;
-
if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
filt = 0;
else
filt = 2;
for (prescale = 0; prescale <= 7; prescale++) {
- clk_cycle = clk_rate / ((1 << prescale) * lpi2c_imx->bitrate)
+ clk_cycle = lpi2c_imx->clk_rate / ((1 << prescale) * lpi2c_imx->bitrate)
- 3 - (filt >> 1);
clkhi = DIV_ROUND_UP(clk_cycle, I2C_CLK_RATIO + 1);
clklo = clk_cycle - clkhi;
@@ -493,6 +490,8 @@ static int lpi2c_imx_probe(struct device *dev)
if (ret)
return ret;
+ lpi2c_imx->clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
+
temp = readl(lpi2c_imx->base + LPI2C_PARAM);
lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
--
2.39.2
next prev parent reply other threads:[~2024-02-02 15:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-02 15:31 [PATCH 0/8] ARM: i.MX93: TQMA93xx: Add LGA variant Sascha Hauer
2024-02-02 15:31 ` Sascha Hauer [this message]
2024-02-02 15:31 ` [PATCH 2/8] i2c: lpi2c: use udelay for timeout loops Sascha Hauer
2024-02-02 15:31 ` [PATCH 3/8] i2c: lpi2c: add PBL support Sascha Hauer
2024-02-02 15:31 ` [PATCH 4/8] pbl: eeprom: return error from eeprom_read() Sascha Hauer
2024-02-02 15:55 ` Ahmad Fatoum
2024-02-02 15:31 ` [PATCH 5/8] common: add TQ EEPROM support Sascha Hauer
2024-02-02 15:56 ` Ahmad Fatoum
2024-02-02 15:31 ` [PATCH 6/8] ARM: i.MX9: add i2c base address defines Sascha Hauer
2024-02-02 15:31 ` [PATCH 7/8] ARM: i.MX9: rename TQ i.MX93 board to TQMA93XX Sascha Hauer
2024-02-02 15:31 ` [PATCH 8/8] ARM: i.MX: tqma93xx: Add LGA board variant Sascha Hauer
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