Commit e39ea136 authored by Marc Kleine-Budde's avatar Marc Kleine-Budde
Browse files

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

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: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent a10fd91e

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

+8 −1
Original line number Diff line number Diff line
@@ -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;

}