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can: mcp251xfd: mcp251xfd_chip_clock_init(): prepare for PLL support, wait for OSC ready

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This patch prepares the mcp251xfd_chip_clock_init() function for PLL
support.

If the PLL is needed is must be switched on after chip reset. This
should be done in the mcp251xfd_chip_clock_init() function. Prepare
this function to wait for the OSC and PLL to be ready.

Link: https://lore.kernel.org/all/20220207131047.282110-14-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2020-10-19 09:59:28 +02:00
parent a10fd91e42
commit e39ea1360c
1 changed files with 8 additions and 1 deletions
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9
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
View File

@ -429,7 +429,7 @@ static int mcp251xfd_chip_softreset(const struct mcp251xfd_priv *priv)
static int mcp251xfd_chip_clock_init(const struct mcp251xfd_priv *priv)
{
u32 osc;
u32 osc, osc_reference, osc_mask;
int err;
/* Activate Low Power Mode on Oscillator Disable. This only
@ -439,10 +439,17 @@ static int mcp251xfd_chip_clock_init(const struct mcp251xfd_priv *priv)
osc = MCP251XFD_REG_OSC_LPMEN |
FIELD_PREP(MCP251XFD_REG_OSC_CLKODIV_MASK,
MCP251XFD_REG_OSC_CLKODIV_10);
osc_reference = MCP251XFD_REG_OSC_OSCRDY;
osc_mask = MCP251XFD_REG_OSC_OSCRDY | MCP251XFD_REG_OSC_PLLRDY;
err = regmap_write(priv->map_reg, MCP251XFD_REG_OSC, osc);
if (err)
return err;
err = mcp251xfd_chip_wait_for_osc_ready(priv, osc_reference, osc_mask);
if (err)
return err;
return 0;
}