From: Dhruva Gole Date: Mon, 30 Sep 2024 09:32:09 +0000 (+0530) Subject: cpufreq: ti-cpufreq: Allow backward compatibility for efuse syscon X-Git-Tag: v6.13-rc1~107^2~1^2~16 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1724ae88efcbcd0daeb203ffeb4a2c0e59f2ddf7;p=thirdparty%2Fkernel%2Flinux.git cpufreq: ti-cpufreq: Allow backward compatibility for efuse syscon The AM625 syscon for efuse was being taken earlier from the wkup_conf node where the entire wkup_conf was marked as "syscon". This is wrong and will be fixed in the devicetree. However, whenever that does happen will end up breaking this driver for that device because of the change in efuse offset. Hence, to avoid breaking any sort of backward compatibility of devicetrees use a quirk to distinguish and accordingly use 0x0 offset for the new syscon node. Suggested-by: Nishanth Menon Signed-off-by: Dhruva Gole Reviewed-by: Nishanth Menon Signed-off-by: Viresh Kumar --- diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c index ba621ce1cdda6..7014cebb41e34 100644 --- a/drivers/cpufreq/ti-cpufreq.c +++ b/drivers/cpufreq/ti-cpufreq.c @@ -93,6 +93,8 @@ struct ti_cpufreq_soc_data { bool multi_regulator; /* Backward compatibility hack: Might have missing syscon */ #define TI_QUIRK_SYSCON_MAY_BE_MISSING 0x1 +/* Backward compatibility hack: new syscon size is 1 register wide */ +#define TI_QUIRK_SYSCON_IS_SINGLE_REG 0x2 u8 quirks; }; @@ -318,6 +320,7 @@ static struct ti_cpufreq_soc_data am625_soc_data = { .efuse_shift = 0x6, .rev_offset = 0x0014, .multi_regulator = false, + .quirks = TI_QUIRK_SYSCON_IS_SINGLE_REG, }; static struct ti_cpufreq_soc_data am62a7_soc_data = { @@ -354,6 +357,10 @@ static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data, ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset, &efuse); + + if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_IS_SINGLE_REG && ret == -EIO) + ret = regmap_read(opp_data->syscon, 0x0, &efuse); + if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) { /* not a syscon register! */ void __iomem *regs = ioremap(OMAP3_SYSCON_BASE +