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It is > mapped with devm_platform_get_and_ioremap_resource(), though, which > calls dev_err_probe() when the resource does not exist. Every > non-removable host without a third reg entry therefore logs an error > at probe time and then works normally. > > The binding only describes the "host" and "cfg" ranges, so this is the > case for the in-tree users. On the Raspberry Pi 5 family (BCM2712), > where the SDIO host of the Wi-Fi module is non-removable, each boot > prints: > > sdhci-brcmstb 1001100000.mmc: error -EINVAL: invalid resource (null) > > Look the resource up with platform_get_resource() first and map it only > when it is present. Hosts that do have the range are mapped by the same > two calls as before. > > Fixes: b7e614802e3f ("mmc: sdhci-brcmstb: save and restore registers during PM") > Assisted-by: LLM > Signed-off-by: Karl Mehltretter Acked-by: Adrian Hunter > --- > Tested on a Raspberry Pi 500+ with v7.3-rc4: the message is gone, the > SDIO card is detected as before and Wi-Fi works. Suspend/resume, the > only user of these registers, was not tested. > > drivers/mmc/host/sdhci-brcmstb.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c > index 1de2f05..7c17a3c 100644 > --- a/drivers/mmc/host/sdhci-brcmstb.c > +++ b/drivers/mmc/host/sdhci-brcmstb.c > @@ -491,6 +491,7 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev) > struct sdhci_brcmstb_priv *priv; > u32 actual_clock_mhz; > struct sdhci_host *host; > + struct resource *boot_res; > struct clk *clk; > struct clk *base_clk = NULL; > int res; > @@ -534,9 +535,13 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev) > > /* map non-standard BOOT registers if present */ > if (host->mmc->caps & MMC_CAP_NONREMOVABLE) { > - priv->boot_regs = devm_platform_get_and_ioremap_resource(pdev, 2, NULL); > - if (IS_ERR(priv->boot_regs)) > - priv->boot_regs = NULL; > + boot_res = platform_get_resource(pdev, IORESOURCE_MEM, 2); > + if (boot_res) { > + priv->boot_regs = devm_ioremap_resource(&pdev->dev, > + boot_res); > + if (IS_ERR(priv->boot_regs)) > + priv->boot_regs = NULL; > + } > } > > /* > > base-commit: 6c377d19d4a5116d9bec5203aa3c6c11523e7898