Commit da751726 authored by Alexander Stein's avatar Alexander Stein Committed by Stephen Boyd
Browse files

clk: rs9: Check for vendor/device ID 



This is in preparation to support additional devices which have different
IDs as well as a slightly different register layout.

Signed-off-by: default avatarAlexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: default avatarMarek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230310075535.3476580-1-alexander.stein@ew.tq-group.com


Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent e7241670

drivers/clk/clk-renesas-pcie.c

+24 −0
Original line number Diff line number Diff line
@@ -45,6 +45,13 @@ 
#define RS9_REG_DID				0x6

#define RS9_REG_BCP				0x7



#define RS9_REG_VID_IDT				0x01



#define RS9_REG_DID_TYPE_FGV			(0x0 << RS9_REG_DID_TYPE_SHIFT)

#define RS9_REG_DID_TYPE_DBV			(0x1 << RS9_REG_DID_TYPE_SHIFT)

#define RS9_REG_DID_TYPE_DMV			(0x2 << RS9_REG_DID_TYPE_SHIFT)

#define RS9_REG_DID_TYPE_SHIFT			0x6



/* Supported Renesas 9-series models. */

enum rs9_model {

	RENESAS_9FGV0241,
@@ -54,6 +61,7 @@ enum rs9_model { 
struct rs9_chip_info {

	const enum rs9_model	model;

	unsigned int		num_clks;

	u8			did;

};



struct rs9_driver_data {
@@ -269,6 +277,7 @@ static int rs9_probe(struct i2c_client *client) 
{

	unsigned char name[5] = "DIF0";

	struct rs9_driver_data *rs9;

	unsigned int vid, did;

	struct clk_hw *hw;

	int i, ret;
@@ -305,6 +314,20 @@ static int rs9_probe(struct i2c_client *client) 
	if (ret < 0)

		return ret;



	ret = regmap_read(rs9->regmap, RS9_REG_VID, &vid);

	if (ret < 0)

		return ret;



	ret = regmap_read(rs9->regmap, RS9_REG_DID, &did);

	if (ret < 0)

		return ret;



	if (vid != RS9_REG_VID_IDT || did != rs9->chip_info->did)

		return dev_err_probe(&client->dev, -ENODEV,

				     "Incorrect VID/DID: %#02x, %#02x. Expected %#02x, %#02x\n",

				     vid, did, RS9_REG_VID_IDT,

				     rs9->chip_info->did);



	/* Register clock */

	for (i = 0; i < rs9->chip_info->num_clks; i++) {

		snprintf(name, 5, "DIF%d", i);
@@ -348,6 +371,7 @@ static int __maybe_unused rs9_resume(struct device *dev) 
static const struct rs9_chip_info renesas_9fgv0241_info = {

	.model		= RENESAS_9FGV0241,

	.num_clks	= 2,

	.did		= RS9_REG_DID_TYPE_FGV | 0x02,

};



static const struct i2c_device_id rs9_id[] = {