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pmdomain: mediatek: mtk-mfg: Expose shader_present as nvmem cell

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Implement nvmem-provider functionality in mtk-mfg-pmdomain, such that it
can expose its GF_REG_SHADER_PRESENT value in the shared memory as an
nvmem cell for panthor.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Nicolas Frattaroli
2025-12-20 19:49:55 +01:00
committed by Ulf Hansson
parent 007028ed90
commit aeb6d7c676
1 changed files with 59 additions and 0 deletions
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59
drivers/pmdomain/mediatek/mtk-mfg-pmdomain.c
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@@ -10,6 +10,7 @@
#include <linux/clk-provider.h>
#include <linux/container_of.h>
#include <linux/iopoll.h>
#include <linux/nvmem-provider.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -872,6 +873,60 @@ static int mtk_mfg_init_clk_provider(struct mtk_mfg *mfg)
return 0;
}
static int mtk_mfg_read_nvmem(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct mtk_mfg *mfg = priv;
u32 *buf = val;
if (bytes != 4)
return -EINVAL;
if (!mfg->shared_mem)
return -ENODEV;
if (offset + bytes >= mfg->shared_mem_size)
return -EINVAL;
*buf = readl(mfg->shared_mem + offset);
return 0;
}
static int mtk_mfg_init_nvmem_provider(struct mtk_mfg *mfg)
{
struct device *dev = &mfg->pdev->dev;
struct nvmem_cell_info cell = {};
struct nvmem_config config = {};
struct nvmem_device *nvdev;
int ret;
config.reg_read = mtk_mfg_read_nvmem;
config.dev = dev;
config.read_only = true;
config.priv = mfg;
config.size = 4;
config.word_size = 4;
nvdev = devm_nvmem_register(dev, &config);
if (IS_ERR(nvdev))
return dev_err_probe(dev, PTR_ERR(nvdev), "Couldn't register nvmem provider\n");
cell.name = "shader-present";
cell.offset = GF_REG_SHADER_PRESENT;
cell.bytes = 4;
cell.np = of_get_child_by_name(dev->of_node, cell.name);
ret = nvmem_add_one_cell(nvdev, &cell);
if (ret) {
of_node_put(cell.np);
return dev_err_probe(dev, ret, "Couldn't add cell %s\n", cell.name);
}
/* cell.np purposefully not put as nvmem_add_one_cell does not increase refcount */
return 0;
}
static int mtk_mfg_probe(struct platform_device *pdev)
{
struct mtk_mfg *mfg;
@@ -984,6 +1039,10 @@ static int mtk_mfg_probe(struct platform_device *pdev)
if (ret)
goto err_power_off;
ret = mtk_mfg_init_nvmem_provider(mfg);
if (ret)
goto err_power_off;
ret = of_genpd_add_provider_simple(dev->of_node, &mfg->pd);
if (ret) {
dev_err_probe(dev, ret, "Failed to add pmdomain provider\n");