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authorDmitry Osipenko <digetx@gmail.com>2020-11-11 04:14:38 +0300
committerKrzysztof Kozlowski <krzk@kernel.org>2020-11-26 18:50:36 +0100
commitbf25f3fceffa9e4e5b5a59ed51511ec5ba6a6036 (patch)
tree0b318fee640bb6dfe53ec10f9402e3ffc8a186a2 /drivers/memory/tegra
parent0c56eda86f8cad705d7d14e81e0e4efaeeaf4613 (diff)
memory: tegra30-emc: Continue probing if timings are missing in device-tree
EMC driver will become mandatory after turning it into interconnect provider because interconnect users, like display controller driver, will fail to probe using newer device-trees that have interconnect properties. Thus make EMC driver to probe even if timings are missing in device-tree. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Link: https://lore.kernel.org/r/20201111011456.7875-9-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Diffstat (limited to 'drivers/memory/tegra')
-rw-r--r--drivers/memory/tegra/tegra30-emc.c29
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c
index d0926088360a..3488786da03b 100644
--- a/drivers/memory/tegra/tegra30-emc.c
+++ b/drivers/memory/tegra/tegra30-emc.c
@@ -988,6 +988,11 @@ static struct device_node *emc_find_node_by_ram_code(struct device *dev)
u32 value, ram_code;
int err;
+ if (of_get_child_count(dev->of_node) == 0) {
+ dev_info(dev, "device-tree doesn't have memory timings\n");
+ return NULL;
+ }
+
ram_code = tegra_read_ram_code();
for_each_child_of_node(dev->of_node, np) {
@@ -1057,6 +1062,9 @@ static long emc_round_rate(unsigned long rate,
struct tegra_emc *emc = arg;
unsigned int i;
+ if (!emc->num_timings)
+ return clk_get_rate(emc->clk);
+
min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);
for (i = 0; i < emc->num_timings; i++) {
@@ -1262,16 +1270,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
struct tegra_emc *emc;
int err;
- if (of_get_child_count(pdev->dev.of_node) == 0) {
- dev_info(&pdev->dev,
- "device-tree node doesn't have memory timings\n");
- return -ENODEV;
- }
-
- np = emc_find_node_by_ram_code(&pdev->dev);
- if (!np)
- return -EINVAL;
-
emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
if (!emc) {
of_node_put(np);
@@ -1285,10 +1283,13 @@ static int tegra_emc_probe(struct platform_device *pdev)
emc->clk_nb.notifier_call = emc_clk_change_notify;
emc->dev = &pdev->dev;
- err = emc_load_timings_from_dt(emc, np);
- of_node_put(np);
- if (err)
- return err;
+ np = emc_find_node_by_ram_code(&pdev->dev);
+ if (np) {
+ err = emc_load_timings_from_dt(emc, np);
+ of_node_put(np);
+ if (err)
+ return err;
+ }
emc->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(emc->regs))