Re: [PATCH v6 3/7] mtd: spi-nor: sfdp: expose the SFDP as a read-only NVMEM device
<[email protected]> Wed, 29 Jul 2026 09:08:30 +0000
| Newsgroups | org.infradead.lists.linux-mtd,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel,org.kernel.vger.netdev |
|---|---|
| Message-ID | <[email protected]> |
SGkgTWljaGFlbCwNCg0KT24gNy8yOS8yNiAxMzozMSwgTWljaGFlbCBXYWxsZSB3cm90ZToNCj4g T24gV2VkIEp1bCAyOSwgMjAyNiBhdCA2OjMwIEFNIENFU1QsIE1hbmlrYW5kYW4gTXVyYWxpZGhh cmFuIHdyb3RlOg0KPiAuLg0KPiANCj4+ICtzdGF0aWMgdm9pZCBzcGlfbm9yX3NmZHBfbnZtZW1f cHV0X25wKHZvaWQgKmRhdGEpDQo+PiArew0KPj4gKwlvZl9ub2RlX3B1dChkYXRhKTsNCj4+ICt9 DQo+PiArDQo+PiArLyoqDQo+PiArICogc3BpX25vcl9yZWdpc3Rlcl9zZmRwX252bWVtKCkgLSBl eHBvc2UgdGhlIFNGRFAgYXMgYSByZWFkLW9ubHkgTlZNRU0gZGV2aWNlDQo+PiArICogQG5vcjoJ cG9pbnRlciB0byBhICdzdHJ1Y3Qgc3BpX25vcicNCj4+ICsgKg0KPj4gKyAqIEV4cG9zZSB0aGUg d2hvbGUgU0ZEUCwgaW4gb24tZmxhc2ggYnl0ZSBvcmRlciwgYXMgYSByZWFkLW9ubHkgTlZNRU0g ZGV2aWNlDQo+PiArICogcm9vdGVkIGF0IHRoZSBmbGFzaCdzIFNGRFAgY2hpbGQgbm9kZSAoY29t cGF0aWJsZSAiamVkZWMsc2ZkcCIpLiBUaGlzIGxldHMNCj4+ICsgKiBnZW5lcmljIChmaXhlZC1s YXlvdXQpIG9yIHZlbmRvciAobnZtZW0tbGF5b3V0KSBjZWxscyByZWZlcmVuY2UgYW55IFNGRFAN Cj4+ICsgKiBkYXRhLiBUaGUgZGV2aWNlIGlzIG9ubHkgcmVnaXN0ZXJlZCB3aGVuIGEgY2hpbGQg bm9kZSB3aXRoIHRoZSAiamVkZWMsc2ZkcCINCj4+ICsgKiBjb21wYXRpYmxlIGlzIGRlc2NyaWJl ZCBpbiB0aGUgZGV2aWNlIHRyZWUuDQo+PiArICoNCj4+ICsgKiBSZXR1cm46IDAgb24gc3VjY2Vz cyBvciBpZiB0aGVyZSBpcyBub3RoaW5nIHRvIGRvLCAtZXJybm8gb3RoZXJ3aXNlLg0KPj4gKyAq Lw0KPj4gK3N0YXRpYyBpbnQgc3BpX25vcl9yZWdpc3Rlcl9zZmRwX252bWVtKHN0cnVjdCBzcGlf bm9yICpub3IpDQo+PiArew0KPj4gKwlzdHJ1Y3QgZGV2aWNlICpkZXYgPSBub3ItPmRldjsNCj4+ ICsJc3RydWN0IG52bWVtX2NvbmZpZyBjb25maWcgPSB7IH07DQo+PiArCXN0cnVjdCBudm1lbV9k ZXZpY2UgKm52bWVtOw0KPj4gKwlzdHJ1Y3QgZGV2aWNlX25vZGUgKm5wOw0KPj4gKwlpbnQgcmV0 Ow0KPj4gKw0KPj4gKwlpZiAoIW5vci0+c2ZkcCkNCj4+ICsJCXJldHVybiAwOw0KPj4gKw0KPj4g KwlucCA9IG9mX2dldF9jb21wYXRpYmxlX2NoaWxkKGRldl9vZl9ub2RlKGRldiksICJqZWRlYyxz ZmRwIik7DQo+PiArCWlmICghbnApDQo+PiArCQlyZXR1cm4gMDsNCj4+ICsNCj4+ICsJLyoNCj4+ ICsJICogUmVnaXN0ZXIgdGhlIHB1dCBiZWZvcmUgZGV2bV9udm1lbV9yZWdpc3RlcigpIHNvIGl0 IHJ1bnMgbGFzdCBvbg0KPj4gKwkgKiBkZXRhY2gsIGFmdGVyIHRoZSBOVk1FTSBkZXZpY2UgdGhh dCB1c2VzIHRoZSBub2RlIGlzIGdvbmUuDQo+PiArCSAqLw0KPj4gKwlyZXQgPSBkZXZtX2FkZF9h Y3Rpb25fb3JfcmVzZXQoZGV2LCBzcGlfbm9yX3NmZHBfbnZtZW1fcHV0X25wLCBucCk7DQo+PiAr CWlmIChyZXQpDQo+PiArCQlyZXR1cm4gcmV0Ow0KPiANCj4gU29ycnkgSSd2ZSBtaXNzZWQgdGhh dCBpbiB0aGUgcHJldmlvdXMgdmVyc2lvbi4gSSBndWVzcyB3ZSBkbyB0aGF0DQo+IGJlY2F1c2Ug d2UgaGFuZCB0aGUgZGV2aWNlX25vZGUgdG8gbnZtZW0uIEJ1dCBzaG91bGRuJ3QgaXQgYmUgcGFy dA0KPiBvZiB0aGUgTlZNRU0gZnJhbWV3b3JrIHRvIGRvIGEgb2Zfbm9kZV9nZXQoKT8NCj4gDQpZ ZXMsIFlvdSdyZSByaWdodCDigJQgTlZNRU0gZG9lc24ndCB0YWtlIGl0cyBvd24gcmVmZXJlbmNl IG9uIGNvbmZpZy5vZl9ub2RlLg0KPj4gKw0KPj4gKwljb25maWcuZGV2ID0gZGV2Ow0KPj4gKwlj b25maWcub2Zfbm9kZSA9IG5wOw0KPj4gKwljb25maWcubmFtZSA9ICJzZmRwIjsNCj4+ICsJY29u ZmlnLmlkID0gTlZNRU1fREVWSURfQVVUTzsNCj4+ICsJY29uZmlnLm93bmVyID0gVEhJU19NT0RV TEU7DQo+PiArCWNvbmZpZy5yZWFkX29ubHkgPSB0cnVlOw0KPj4gKwljb25maWcud29yZF9zaXpl ID0gMTsNCj4+ICsJY29uZmlnLnN0cmlkZSA9IDE7DQo+PiArCWNvbmZpZy5zaXplID0gKGludCko bm9yLT5zZmRwLT5udW1fZHdvcmRzICogc2l6ZW9mKCpub3ItPnNmZHAtPmR3b3JkcykpOw0KPj4g Kwljb25maWcucmVnX3JlYWQgPSBzcGlfbm9yX3NmZHBfcmVnX3JlYWQ7DQo+PiArCWNvbmZpZy5w cml2ID0gbm9yOw0KPj4gKw0KPj4gKwludm1lbSA9IGRldm1fbnZtZW1fcmVnaXN0ZXIoZGV2LCAm Y29uZmlnKTsNCj4+ICsJaWYgKElTX0VSUihudm1lbSkpIHsNCj4+ICsJCS8qIE5WTUVNIHN1cHBv cnQgaXMgb3B0aW9uYWwuICovDQo+PiArCQlpZiAoUFRSX0VSUihudm1lbSkgPT0gLUVPUE5PVFNV UFApDQo+PiArCQkJcmV0dXJuIDA7DQo+PiArCQlyZXR1cm4gZGV2X2Vycl9wcm9iZShkZXYsIFBU Ul9FUlIobnZtZW0pLA0KPj4gKwkJCQkgICAgICJmYWlsZWQgdG8gcmVnaXN0ZXIgU0ZEUCBOVk1F TSBkZXZpY2VcbiIpOw0KPj4gKwl9DQo+PiArDQo+IA0KPiBzbyB3ZSBjYW4gZG8gYSBvZl9ub2Rl X3B1dCgpIGhlcmU/DQpJJ2xsIGZvbGxvdyB0aGF0IGluIHY3IGFuZCBkcm9wIHRoZSBkZXZtX2Fk ZF9hY3Rpb25fb3JfcmVzZXQoKS4NCj4gDQo+IC1taWNoYWVsDQo+IA0KPj4gKwlkZXZfZGJnKGRl diwgImV4cG9zZWQgJWQtYnl0ZSBTRkRQIGFzIGFuIE5WTUVNIGRldmljZVxuIiwgY29uZmlnLnNp emUpOw0KPj4gKw0KPj4gKwlyZXR1cm4gMDsNCj4+ICt9DQo+PiArDQoNCg0KLS0gDQpUaGFua3Mg YW5kIFJlZ2FyZHMsDQpNYW5pa2FuZGFuIE0uDQpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KTGludXggTVREIGRpc2N1c3Npb24gbWFpbGluZyBs aXN0Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtbXRk Lwo=