Dear Marek,
From: Marek Vasut marex@denx.de Sent: vendredi 10 avril 2020 20:56
Add support for multiple DRAM configuration subnodes, while retaining the support for a single flat DRAM configuration node. This is useful on systems which can be manufactured in multiple configurations and where the DRAM configuration can be determined at runtime.
The code is augmented by a function which can be overridden on board level, allowing a match on the configuration node name, very much like the fitImage configuration node name matching works. The default match is on the single top- level DRAM configuration, if matching on subnodes is required, then this board_stm32mp1_ddr_config_name_match() must be overridden.
Signed-off-by: Marek Vasut marex@denx.de Cc: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Cc: Patrick Delaunay patrick.delaunay@st.com Cc: Patrice Chotard patrice.chotard@st.com
V2: Match on compatible string
drivers/ram/stm32mp1/stm32mp1_ram.c | 39 +++++++++++++++++++++++++---- 1 file changed, 34 insertions(+), 5 deletions(-)
diff --git a/drivers/ram/stm32mp1/stm32mp1_ram.c b/drivers/ram/stm32mp1/stm32mp1_ram.c index eb78f1198d..21c220694e 100644 --- a/drivers/ram/stm32mp1/stm32mp1_ram.c +++ b/drivers/ram/stm32mp1/stm32mp1_ram.c @@ -57,6 +57,33 @@ int stm32mp1_ddr_clk_enable(struct ddr_info *priv, uint32_t mem_speed) return 0; }
+__weak int board_stm32mp1_ddr_config_name_match(struct udevice *dev,
const char *name)+{
- return 0; /* Always match */
+}
+static ofnode stm32mp1_ddr_get_ofnode(struct udevice *dev) {
- const char *name;
- int name_size;
- ofnode node;
- node = dev_ofnode(dev);
- name = ofnode_get_property(node, "compatible", &name_size);
- if (!board_stm32mp1_ddr_config_name_match(dev, name))
return node;- dev_for_each_subnode(node, dev) {
name = ofnode_get_property(node, "compatible", &name_size);if (!board_stm32mp1_ddr_config_name_match(dev, name))return node;- }
- return ofnode_null();
+}
I think the ddr node could be the fallback when any subnode exist: board_stm32mp1_ddr_config_name_match() is only usefull/called when several configuration exist.
And name_size can be replaced by NULL,
So function can be simplify to:
static ofnode stm32mp1_ddr_get_ofnode(struct udevice *dev) { const char *name; ofnode node;
dev_for_each_subnode(node, dev) { name = ofnode_get_property(node, "compatible", NULL);
if (!board_stm32mp1_ddr_config_name_match(dev, name)) return node; }
return dev_ofnode(dev); }
static __maybe_unused int stm32mp1_ddr_setup(struct udevice *dev) { struct ddr_info *priv = dev_get_priv(dev); @@ -64,6 +91,7 @@ static __maybe_unused int stm32mp1_ddr_setup(struct udevice *dev) unsigned int idx; struct clk axidcg; struct stm32mp1_ddr_config config;
- ofnode node = stm32mp1_ddr_get_ofnode(dev);
[...]
@@ -164,7 +192,8 @@ static int stm32mp1_ddr_probe(struct udevice *dev) priv->info.size = 0; return stm32mp1_ddr_setup(dev); #else
- priv->info.size = dev_read_u32_default(dev, "st,mem-size", 0);
- ofnode node = stm32mp1_ddr_get_ofnode(dev);
- priv->info.size = ofnode_read_u32_default(node, "st,mem-size", 0); return 0;
#endif } -- 2.25.1
For the rest
Reviewed-by: Patrick Delaunay patrick.delaunay@st.com
Thanks
Patrick