[PATCH v7 1/7] memory: jz4780_nemc: Only request IO memory the driver will use
From: H. Nikolaus Schaller <hidden>
Date: 2020-02-28 13:58:34
Also in:
linux-devicetree, lkml
Subsystem:
ingenic jz47xx socs, memory controller drivers, the rest · Maintainers:
Paul Cercueil, Krzysztof Kozlowski, Linus Torvalds
From: Paul Cercueil <paul@crapouillou.net> The driver only uses the registers up to offset 0x54. Since the EFUSE registers are in the middle of the NEMC registers, we only request the registers we will use for now - that way the EFUSE driver can probe too. Tested-by: H. Nikolaus Schaller <redacted> Signed-off-by: Paul Cercueil <paul@crapouillou.net> --- drivers/memory/jz4780-nemc.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/memory/jz4780-nemc.c b/drivers/memory/jz4780-nemc.c
index b232ed279fc3..647267ea8c63 100644
--- a/drivers/memory/jz4780-nemc.c
+++ b/drivers/memory/jz4780-nemc.c@@ -8,6 +8,7 @@ #include <linux/clk.h> #include <linux/init.h> +#include <linux/io.h> #include <linux/math64.h> #include <linux/of.h> #include <linux/of_address.h>
@@ -288,7 +289,19 @@ static int jz4780_nemc_probe(struct platform_device *pdev) nemc->dev = dev; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - nemc->base = devm_ioremap_resource(dev, res); + + /* + * The driver only uses the registers up to offset 0x54. Since the EFUSE + * registers are in the middle of the NEMC registers, we only request + * the registers we will use for now - that way the EFUSE driver can + * probe too. + */ + if (!devm_request_mem_region(dev, res->start, 0x54, dev_name(dev))) { + dev_err(dev, "unable to request I/O memory region\n"); + return -EBUSY; + } + + nemc->base = devm_ioremap(dev, res->start, resource_size(res)); if (IS_ERR(nemc->base)) { dev_err(dev, "failed to get I/O memory\n"); return PTR_ERR(nemc->base);
--
2.23.0