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| author | Alexander Stein <alexander.stein@ew.tq-group.com> | 2023-03-10 08:55:32 +0100 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2023-03-27 19:50:57 +0200 |
| commit | da751726ff2ad2322d81316ebf6aadb22dfad0d8 (patch) | |
| tree | 65771d709cd3afc378feb700bf034c55ad211019 /drivers/clk/clk-renesas-pcie.c | |
| parent | Merge tag 'renesas-clk-for-v6.4-tag1' of git://git.kernel.org/pub/scm/linux/k... (diff) | |
| download | linux-da751726ff2ad2322d81316ebf6aadb22dfad0d8.tar.xz linux-da751726ff2ad2322d81316ebf6aadb22dfad0d8.zip | |
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: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230310075535.3476580-1-alexander.stein@ew.tq-group.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/clk-renesas-pcie.c')
| -rw-r--r-- | drivers/clk/clk-renesas-pcie.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/clk/clk-renesas-pcie.c b/drivers/clk/clk-renesas-pcie.c index f91f30560820..3873c52ad3b0 100644 --- a/drivers/clk/clk-renesas-pcie.c +++ b/drivers/clk/clk-renesas-pcie.c @@ -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[] = { |