Merge "drivers: of: Add APIs to find DDR device rank, HBB" (00a4cbc4) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/of/fdt.c

+63 −0

Original line number	Diff line number	Diff line
		@@ -79,6 +79,69 @@ void of_fdt_limit_memory(int limit)
		}
		}

		/**
		* of_fdt_get_ddrhbb - Return the highest bank bit of ddr on the current device
		*
		* On match, returns a non-zero positive value which matches the highest bank
		* bit.
		* Otherwise returns -ENOENT.
		*/
		int of_fdt_get_ddrhbb(int channel, int rank)
		{
		int memory;
		int len;
		int ret;
		/* Single spaces reserved for channel(0-9), rank(0-9) */
		char pname[] = "ddr_device_hbb_ch _rank ";
		fdt32_t *prop = NULL;

		memory = fdt_path_offset(initial_boot_params, "/memory");
		if (memory > 0) {
		snprintf(pname, sizeof(pname),
		"ddr_device_hbb_ch%d_rank%d", channel, rank);
		prop = fdt_getprop_w(initial_boot_params, memory,
		pname, &len);
		}

		if (!prop \|\| len != sizeof(u32))
		return -ENOENT;

		ret = fdt32_to_cpu(*prop);

		return ret;
		}

		/**
		* of_fdt_get_ddrrank - Return the rank of ddr on the current device
		*
		* On match, returns a non-zero positive value which matches the ddr rank.
		* Otherwise returns -ENOENT.
		*/
		int of_fdt_get_ddrrank(int channel)
		{
		int memory;
		int len;
		int ret;
		/* Single space reserved for channel(0-9) */
		char pname[] = "ddr_device_rank_ch ";
		fdt32_t *prop = NULL;

		memory = fdt_path_offset(initial_boot_params, "/memory");
		if (memory > 0) {
		snprintf(pname, sizeof(pname),
		"ddr_device_rank_ch%d", channel);
		prop = fdt_getprop_w(initial_boot_params, memory,
		pname, &len);
		}

		if (!prop \|\| len != sizeof(u32))
		return -ENOENT;

		ret = fdt32_to_cpu(*prop);

		return ret;
		}

		/**
		* of_fdt_get_ddrtype - Return the type of ddr (4/5) on the current device
		*

+2 −0

Original line number	Diff line number	Diff line
		@@ -48,6 +48,8 @@ extern char __dtb_end[];
		extern u64 of_flat_dt_translate_address(unsigned long node);
		extern void of_fdt_limit_memory(int limit);
		extern int of_fdt_get_ddrtype(void);
		extern int of_fdt_get_ddrrank(int channel);
		extern int of_fdt_get_ddrhbb(int channel, int rank);
		#endif /* CONFIG_OF_FLATTREE */

		#ifdef CONFIG_OF_EARLY_FLATTREE